Cisco 2950 MT-RJ ports - Connect two switches?

Hi Everyone,
I'm wondering if I can connect two cisco 2950s together via the two MT-RJ ports they have?
Basically, I'd like the fibre ports to be the trunk between the two switches if possible
I have two of these:
Thanks!

Hi,
Yes, that is possible. As long as your fiber patch cable is good there should be no issues.
HTH

Similar Messages

Networking Best Practices - Connecting Two Switches

Connecting two switches together is an easy task, which makes it so frustrating when it doesn’t work. Here we will outline a basic scenario of connecting two switches and achieving connectivity. In these scenarios we will be using commands and settings that will work for most modern PowerConnect switches. However this does not cover all possible scenarios and the commands may differ slightly from switch to switch.
For instance, in most cases you can use General or Trunk mode when connecting two switches. However, on the PowerConnect 62xx series switches, you must use General mode if you want to allow management traffic onto the switch over the PVID. If you use Trunk mode, you will not have the default VLAN on those ports. The ports will only allow tagged traffic.
For more details on the difference between Access, General, and Trunk modes, follow this link.
http://en.community.dell.com/support-forums/network-switches/f/866/p/19445142/20089157.aspx#20089157
It is always a good idea to have the user and CLI guide for your switch, to reference any possible changes in command syntax.
http://support.dell.com/support/edocs/network/
Layer 2
Layer 2 switches operate at the data link layer of the OSI model. Layer 2 is responsible for error checking and transmitting data across the physical media. MAC addressing sources and destination protocols are layer 2 protocols. Layer 2 switches use the MAC address of data packets to determine where those packets should go. It learns the MAC addresses of all devices and creates a segment/forwarding table.
When a switch receives a frame with a destination address that isn't in its forwarding table, the switch forwards the frame to all other ports. If the destination machine responds to the server, the switch will listen to the reply and learn which port the destination machine is attached to. It then adds that MAC address to the forwarding table.
The Dell PowerConnect Layer 2 switches have ports that all operate in VLAN 1 by default. If it is acceptable to have all traffic on the same broadcast domain, then you can simply leave the default alone, connect the two switches and traffic will flow.
If you do not want all traffic on the same broadcast domain, then we need to look at adding additional broadcast domains through the use of VLANs.
We will use 3 VLANs for the following scenario.
VLAN 1=Management
VLAN 2=Client
VLAN 3=Server
To create these VLANs we do the following commands (VLAN 1 is already created by default)
console(config)# vlan database
console(config-vlan)# VLAN 2
console(config-vlan)# VLAN 3
console(config-vlan)# exit
We can then name the VLANs to help keep things organized.
console(config)# interface vlan 2
console(config-vlan)# name Client
console(config-vlan)# exit
console(config)# interface vlan 3
console(config-vlan)# name Server
console(config-vlan)# exit
Once we have the VLANs created we can place a device in that VLAN by placing the port it plugs into, in access mode for the specific VLAN.
So we have a workstation on port e2 we want to be placed in VLAN 2, we would issue the following commands.
console(config)# interface ethernet 1/e2
console(config-if)# switchport mode access
console(config-if)# switchport access vlan 2
console(config-if)# exit
The next port plugs into a server on port e3 we want on VLAN 3, we would issue these commands.
console(config)# interface ethernet 1/e3
console(config-if)# switchport mode access
console(config-if)# switchport access vlan 3
console(config-if)# exit
For the ports connecting the two switches together, we place the ports in trunk mode and specify the native VLAN and allowed VLANs.
For the port e1 that connect the two switches to each other would be configured like this.
console(config)# interface ethernet 1/e1
console(config-if)# switchport mode general
console(config-if)# switchport general allowed vlan add 2,3 tagged
console(config-if)# switchport general pvid 1
console(config-if)# exit
Once these VLANs and port settings are made on both switches. A server connected to switch A on VLAN 3 should be able to communicate with another Server connected to switch B that is also in VLAN 3. Without the use of a router the devices in VLAN 3 will not be able to communicate with devices that are outside of their broadcast domain (i.e. VLAN 2 devices could not reach VLAN 3 devices)
Layer 3 + Layer 2
Until recently, routers were the only devices capable of layer 3 protocols. Switches capable of routing are now available and in widespread use. In most cases we will connect our layer 2 switches to a Layer 3 capable switch to perform our routing for us.
On the layer 3 switches we will use the same VLANs and setup that we did with the layer 2 switches. Then we will add to the configuration.
We can assign an IP address to each switch with the following command.
Switch A
console(config)#ip address 172.16.1.1 255.255.255.0
Switch B
console(config)#ip address 172.16.2.1 255.255.255.0
Then we will enable routing only on Switch A
console(config)# ip routing
Switch A we assign an IP address to VLAN 2 and enabling routing on the VLAN.
console(config)# interface vlan 2
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 172.16.20.1 255.255.255.0
console(config-if-vlan2)# exit
Switch A we assign an IP address to VLAN 3 and enabling routing on the VLAN.
console(config)# interface vlan 3
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 172.16.30.1 255.255.255.0
console(config-if-vlan2)# exit
On both switch A and switch B we will keep things simple and use interface 1/e1 for the connection between each switch. Setting both switches 1/e1 to general mode, allowing the additional VLAN 2,3, and keeping the PVID of 1.
console(config)# interface ethernet 1/e1
console(config-if)# switchport mode general
console(config-if)# switchport general allowed vlan add 2,3 tagged
console(config-if)# switchport general pvid 1
console(config-if)# exit
We will have one client computer connect to switch A on port 1/e2 and one client connect to switch B on port 1/e2. These ports will be in access mode for VLAN 2, and the config should look like this on both switches.
console(config)# interface ethernet 1/e2
console(config-if)# switchport mode access
console(config-if)# switchport access vlan 2
console(config-if)# exit
We will have another client computer connect to switch A on port 1/e3 and one client connect to switch B on port 1/e3. These ports will be in access mode for VLAN 3, and the config should look like this on both switches.
console(config)# interface ethernet 1/e3
console(config-if)# switchport mode access
console(config-if)# switchport access vlan 3
console(config-if)# exit
On Clients connected to Switch A we will assign an IP address and gateway based on the VLAN they are in access mode for.
Client connected to access port for VLAN 2.
IP Address:172.16.20.11
Default Gateway:172.16.20.1
Client connected to access port for VLAN 3.
IP Address:172.16.30.11
Default Gateway:172.16.30.1
On Clients connected to Switch B we will assign an IP address and gateway based on the VLAN they are in access mode for.
Client connected to access port for VLAN 2.
IP Address:172.16.20.12
Default Gateway:172.16.20.1
Client connected to access port for VLAN 3.
IP Address:172.16.30.12
Default Gateway:172.16.30.1
External Connection
At some point we may want traffic to have an external connection. To do this we can create a new VLAN for our point to point connection from Switch A to our router. We will use VLAN 7 for this and assign an IP address.
console(config)# vlan database
console(config-vlan)# VLAN 7
console(config-vlan)# exit
console(config)# interface vlan 7
console(config-vlan)# name WAN
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 10.10.10.2 255.255.255.0
console(config-if-vlan2)# exit
On our router we will assign an IP address of 10.10.10.1
Then place the port connecting the switch and router into access mode for VLAN 7. In this case we use port e4.
console(config)# interface ethernet 1/e4
console(config-if)# switchport mode access
console(config-if)# switchport access vlan 7
console(config-if)# exit
We will then need to put in a default route with the next hop as the router IP address. This allows the switch to know where to route traffic not destined for VLANs 2, 3, or 7.
console(config)#ip route 0.0.0.0 0.0.0.0 10.10.10.1
Next on the router we’ll need to add a route back so the router knows about the networks attached to switch A. Generally adding a static route on most routers is done with the following command:
ip route {Network} {Wildcard Mask} {Next Hop-IP}
In our case here are the 2 static routes we could use.
Ip route 172.16.20.0 0.0.0.255 10.10.10.2
Ip route 172.16.30.0 0.0.0.255 10.10.10.2
The routing that we enabled on Switch A will enable traffic from the other VLANs to traverse over port 1/e4 to the router, connecting us to external traffic. The routes we added to the router allow the traffic to flow back to the switch over port 1/e4.
Layer 3 + Layer 3
In some situations we have two switches, each setup to route for its own broadcast domain, which we want to connect together. In this situation we no longer have a need to use Trunk or General mode between the switches. Instead we can create a common VLAN that will be used for the connection between the two switches.
To create this VLAN we will run the following commands on both switch A and B
console(config)# vlan database
console(config-vlan)# vlan 6
console(config-vlan)# exit
console(config)# interface vlan 6
console(config-vlan)# name Connection
console(config-vlan)# exit
On switch A we assign an IP address to VLAN 6 and enable routing on the VLAN.
console(config)# interface vlan 6
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 172.16.60.1 255.255.255.0
console(config-if-vlan2)# exit
On switch B we assign an IP address to VLAN 6 and enable routing on the VLAN.
console(config)# interface vlan 6
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 172.16.60.2 255.255.255.0
console(config-if-vlan2)# exit
On both switch A and B we place the connecting ports into Access mode for VLAN 6.
console(config)# interface ethernet 1/e1
console(config-if)# switchport mode access
console(config-if)# switchport access vlan 6
console(config-if)# exit
We then need to make some changes to switch B now that it is layer 3 and not layer 2 and has its own broadcast domain.
We will enable routing on Switch B
console(config)# ip routing
What used to be VLAN 2 and 3 will now be VLAN 4 and 5 for our separate broadcast domains.
Switch B we assign an IP address to VLAN 4 and enabling routing on the VLAN.
console(config)# interface vlan 4
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 172.16.40.1 255.255.255.0
console(config-if-vlan2)# exit
Switch B we assign an IP address to VLAN 5 and enabling routing on the VLAN.
console(config)# interface vlan 5
console(config-if-vlan2)# Routing
console(config-if-vlan2)# ip address 172.16.50.1 255.255.255.0
console(config-if-vlan2)# exit
On Clients connected to Switch B we will assign an IP address and gateway based on the VLAN they are in access mode for.
Client connected to access port for VLAN 4.
IP Address:172.16.40.11
Default Gateway:172.16.40.1
Client connected to access port for VLAN 5.
IP Address:172.16.50.11
Default Gateway:172.16.50.1
The end result should look like this.
Troubleshooting
If we are having issues with connectivity, we may need to place some static routes in place to help traffic to the next hop in the network.
On switch A we configure a static route to help traffic to the next hop in the network, which is the router.
console(config)# ip route 0.0.0.0 0.0.0.0 10.10.10.1
The external router will also need a path defined back to all networks/VLANs.
To check the status of a port we can use the command. Show interfaces detail, this will help us see the port status. For example to check the status of port 48, we would run this command.
console# show interfaces detail ethernet 1/g48
To check routing paths:
console# show ip route
The IP address of the network for each VLAN should be listed as C – Connected. Then also a path or default route to your upstream router.
We can use basic ping commands from a client to help test where connectivity is dropping off at. By doing this we can narrow down where in the network to start troubleshooting.
-Ping from client to default gateway, being the VLAN the client is in access mode for. If this fails then we may need to double check our client settings making sure the proper IP and gateway are being used.
-Ping from client to the ip address of the switch the client plugs into. If this fails we may not have VLAN routing enabled on the VLAN the client is in.
-Ping from client to another client on same VLAN, same switch. If this fails we need to check on client settings, IP address and gateway.
-ping from client to another client on different VLAN, same switch. If this fails we need to double check the VLAN routing commands are in place.
-ping from client to the ip address of the next switch in the network. If this fails then check Trunk port configuration from switch to switch, ensuring the VLAN is added to the Trunk port.
-ping from client to another client on same VLAN, different switch. If this fails, check Trunk port settings.
-ping from client to another client on different VLAN, different switch. If this fails then check trunk settings and VLAN routing configuration.

Derek,
I tried to draw my prefered setup for this network configuration.
I would create a Team with the two 1 GBit NICs and use it for Domain, DNS, Backup and any SystemCenter Agents.
I would also Team the two 10 GBit NICs and than assign it to a Hyper-V Switch for the VMs. In Windows Server 2012 it is posible to create vNICs for the Management OS that use this Hyper-V Switch (Converged Network Design). I would create two vNICs SMB1
and SMB2 to use them for Cluster and Livemigration traffic with SMB Multichannel. If your storage system supports SMB Multichannel you can also use both as storage NICs (but this depends wich vendor you have).
Hope this helps.
Grüße/Regards Carsten Rachfahl | MVP Virtual Machine | MCT | MCITP | MCSA | CCA | Husband and Papa |
www.hyper-v-server.de | First German Gold Virtualisation Kompetenz Partner ---- If my answer is helpful please mark it as answer or press the green arrow.

CLI support for Cisco SG100D-05 5-Port Gigabit Desktop Switch

I would like to know if the SG100D series of switches support the CLI? If not what are the series of switches supported by the CLI.
I am looking for an application where I need to tell which device is connected to which port on a switch. Hence I am looking at this option where I can run a script and use CLI to output the MAC id of devices connected on each port.
Thanks!

Hi Yiu Kay Lee,
Thank you for sending me this document. It was very helpful. But I cannot understand one thing about it. Is it possible to extract the results from the CLI by passing a command via a script e.g. Python and get the results of it into Python?
For e.g.
************Python script ******************
>>print("send command to 200 series Cisco switch")
>> results = show mac-addr-table
>> print results
Please let me know if such interfacing with the CLI is possible or not?
Thanks

Can I connect two switches to a server?

We share an office with another company but we currently have separate servers and networks.
I'm looking into the possibility of us sharing their server.
The thing is we both have our own switches and and I want to avoid any rewiring of the network. Will I be able to use two switches?
It's a 2x 2.8 GHz quad core intel xeon (with dual ethernet). So is it just a matter of connecting both switches to the server and configuring them in some way?

Hi Christiaan,
I end up doing this quite often. You have a few options, the simplest is below...
How many users and devices that require network connections does each company have? If it's under 254 which it sounds like it is and your happy to have the users on the same network, sharing the same ISP. Then the easiest option is going to be your company sharing their network. You'd save a bit of money on your internet connection which could be used to increase the bandwidth on the other companies line if needed.
You would do following. Make sure all devices that need a fixed IP address such as printers/mfds'/switches/WiFI/phone system (if applicable) are changed to a fixed IP address with the relevant subnet mask, dns and gateway from the other companies network. You'd obviously need to get the relevant numbers from their IT guy.
Then you could use your switch as extra capacity on their network by linking it with their switch. Obviously you'd want to use the fastest possible connection between the switches or look to buying something new with more ports. If you both have something like the HP 1810G ProCurve or a compatible switch you can buy two fibre transceivers and connect them with a fibre cable, this will free up more ports for users on the switch or simply connect them via an ethernet cable. On the 1800 series you can use LACP which allows you to use up to 4 ethernet ports to improve the bandwidth thus giving you a 4gigabit connection to their network. Depending on how much traffic there is going to be you might want to skip that as there might be no need.
Then it's just a case of creating your users on their server and creating an area for your company that only you have the access rights to and creating a shared area inter-company area if you want to easily ping them over files.
What do you both use for email? Are you going to look to share a server for it?
Hope that helps
Beatle

BT HH 4 - GigE port - connection to switch

Anyone know how I can connect the GigE port to a switch at 1Gbps?
I connect the HH4 GigE port to my computer and it does so at 1Gbps (according to Windows XP)
I connect my computer to a netgear GS608 and it does so at 1Gbps (according to Netgear status lights and Windows XP)
I connect the HH4 GigE port to the GS608 and it does so at 100Mbps!! (according to the status lights on the GS608)
Cat 5 cable used - BT Home Hub 4 (Type A) | Software version 4.7.5.1.83.8.130.1.10 | Last updated 20/08/13

correct about cable.
Cat5 is not suited for Gig speeds.
Cat5E can cope but again would be the weak link if the hardware can utilize the speeds.
Your switch maybe picking up the inablilitly of the Cat5 cable to produce the right speeds and is auto switching down to maxamize stability. Borrow or buy a Cat6 cable and try that out
If I've helped, just click the Star - Every little bit helps
If you can't fix it with a hammer, you've got an electrical problem.

WLC5508 connected two switches

Dear All,
I have a WLC 5508 and a brief connected like below.
Internet->Router->2960G A-> (Port0) WLC5508 (Port1) -> 2960G B-> Access Points <-> wireless clients
My Question : Is the above topology work? The access points register to the controller via 2960B, and the data traffic ffrom wireless clients go through from 2960G B to WLC port 1, and WLC pass it to port 0 itself and then go to internet?
Thanks.
Mic

As long as you don't have LAG enabled that will work. You do need to specify a dynamic interface in which the Internet traffic will egress. Your management will be primary port 1 and the your dynamic interface will be primary port 2. Of course port 1 and port 2 would have to be on a different subnet.
If you have both on the same subnet, that will not work. You would trunk the ports and only allow the vlans for that port. Port 1 connected to the switch would only allow the vlan for the management. Port 2 connected on the switch will only allow the vlan for that dynamic interface.
Sent from Cisco Technical Support iPhone App

Cisco SG300-52 52-Port Gigabit Managed Switch losing VLAN-Port Membership

Hello
We have some cisco switches in use and we're facing some problems everytime the switch loses Power.
After a reboot the port/vlan membership is lost, so are other settings recently made (like SSH access allowed, etc.).
The settings made up a year ago like the IPs, password, etc. remain untouched.
Upgrading the Firmware, Saving the Configs, etc. didn't solve the problem.
Is this a known issue? Anyone facing the same problem?
Bye and thanks for the help.
Viktor

Vlan Name Tagged Ports UnTagged Ports Created by
1 1 gi51-52,Po1-8 D
10 10 gi51-52 S
20 20 gi51-52 S
30 30 gi51-52 S
40 40 gi51-52 gi1-9,gi14-34, S
gi38-41,gi49-50
50 50 gi51-52 S
100 100 gi51-52 S
190 SecurityNetwork gi51-52 gi11-13,gi35-37 S
200 200 gi51-52 S
210 Wireless gi51-52 gi10 S
300 ServerSubnetOne gi51-52 gi42-48 S
config-file-header
as4
v1.4.0.88 / R800_NIK_1_4_194_194
CLI v1.0
set system mode switch
file SSD indicator encrypted
ssd-control-start
ssd config
ssd file passphrase control unrestricted
no ssd file integrity control
ssd-control-end cb0a3fdb1f3a1af4e4430033719968c0
no cdp run
no spanning-tree
port jumbo-frame
vlan database
vlan 10,20,30,40,50,100,190,200,210,300
exit
voice vlan state disabled
voice vlan oui-table add 0001e3 Siemens_AG_phone________
voice vlan oui-table add 00036b Cisco_phone_____________
voice vlan oui-table add 00096e Avaya___________________
voice vlan oui-table add 000fe2 H3C_Aolynk______________
voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone
voice vlan oui-table add 00d01e Pingtel_phone___________
voice vlan oui-table add 00e075 Polycom/Veritel_phone___
voice vlan oui-table add 00e0bb 3Com_phone______________
no lldp run
hostname as4
no passwords complexity enable
username cisco password encrypted xxxxx
ip ssh server
snmp-server location Eingang
snmp-server contact [email protected]
clock timezone " " +1
clock source sntp
sntp unicast client enable
sntp unicast client poll
sntp server 157.161.57.2 poll
ip name-server 192.168.200.1
interface vlan 190
name SecurityNetwork
interface vlan 200
ip address 192.168.200.34 255.255.255.0
interface vlan 210
name Wireless
interface vlan 300
name ServerSubnetOne
interface gigabitethernet1
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet2
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet3
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet4
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet5
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet6
spanning-tree disable
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet7
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet8
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet9
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet10
switchport mode access
switchport access vlan 210
lldp med disable
interface gigabitethernet11
switchport mode access
switchport access vlan 190
lldp med disable
interface gigabitethernet12
switchport mode access
switchport access vlan 190
lldp med disable
interface gigabitethernet13
switchport mode access
switchport access vlan 190
lldp med disable
interface gigabitethernet14
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet15
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet16
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet17
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet18
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet19
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet20
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet21
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet22
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet23
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet24
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet25
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet26
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet27
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet28
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet29
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet30
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet31
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet32
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet33
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet34
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet35
switchport mode access
switchport access vlan 190
lldp med disable
interface gigabitethernet36
switchport mode access
switchport access vlan 190
lldp med disable
interface gigabitethernet37
switchport mode access
switchport access vlan 190
lldp med disable
interface gigabitethernet38
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet39
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet40
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet41
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet42
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet43
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet44
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet45
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet46
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet47
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet48
switchport mode access
switchport access vlan 300
lldp med disable
interface gigabitethernet49
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet50
switchport mode access
switchport access vlan 40
lldp med disable
interface gigabitethernet51
switchport trunk allowed vlan add 10,20,30,40,50,100,190,200,210,300
lldp med disable
interface gigabitethernet52
switchport trunk allowed vlan add 10,20,30,40,50,100,190,200,210,300
lldp med disable
exit

Enable port security between Two switches

Hi Everyone,
I connected two switches together via below config
Switch A
int gi0/1
switch mode access
switchport access vlan 10
Switch B
int gi0/1
switch mode access
switchport access vlan 10
They work fine with above config.
I did the Test below
However when i changed Config of Switch B as below
int gi0/1
switch mode access
switchport access vlan 10
switchport port-security
Switch B is unable to ping its default gateway.
Also Switch B is not reachable via SSH.
Port is up up and in STP forwarding state.
Switch B can see Switch A as a neighbour.
Also Switch B is not reachable via SSH.
I know that switchport port-security we use only when connecting to PC.
S does this mean that on above scenario layer 1 and layer 2 are up but layers beyond 3 and above are not reachable like ping,ssh etc??
Regards
MAhesh

I was just trying to see how the switches behave with this config.Nothing much just exploring the options in the network world
Ideally if you want to connect two switches together in Layer 2, Dot1Q trunking is the way to go. You do not want to put port security because it is useless.

Uplink ports and actual switches sfp usages (please help~~)

Dear all,
I am reading around to see the differences between uplink ports and normal ethernet ports. It seems to be uplink port just reverse the rx,tx pins and remove the needs of using a crossover cable.
I have done a simple representation of using the below (normal ethernet ports)
PC
SWITCH
ROUTER
RX
straight
TX
straight
RX
RX
straight
TX
straight
RX
TX
straight
RX
straight
TX
TX
straight
RX
straight
TX
I assumed that the SWITCH ethernet port pins are naturally arranged as opposite from the PC so that a straight cable can be used and the same applies to a router port.
Q1) Hence from PC to Router ethernet port, I will need a cross cable, am I right ?
============================================================
Then I chance upon this website http://duxcw.com/faq/network/uplink.htm which states "A PC can be connected to an uplink port with a crossover cable"
As per my assumption above, a router has normal ethernet ports and uplink ports (for connecting to the wan/modem), since the normal ethernet ports of a router are in the order of (RX,RX,TX,TX) as shown above, I assumed the uplink port is (TX,TX,RX,RX).
PC
ROUTER normal ethernet port
PC
ROUTER uplink port
RX
cross
RX
RX
straight
TX
RX
cross
RX
RX
straight
TX
TX
cross
TX
TX
straight
RX
TX
cross
TX
TX
straight
RX
Q2) So how can the PC connect to the Router's Uplink port using a crossover cable ? Shouldn't it be using straight cable instead if it is trying to connect to a router's uplink port ?
============================================================
Q3) Where connecting switches (switch 1 to swtich2) using uplink port, can I say that a straight cable will be connected to switch 1 uplink port on 1 end, and a normal ethernet port in switch 2 on another end ?
SWITCH#1 ethernet port
SWITCH#1 Uplink port
SWITCH#2 ethernet port
TX
RX
straight
TX
TX
RX
straight
TX
RX
TX
straight
RX
RX
TX
straight
RX
============================================================
Q4) What is the purpose of an SFP port in a switch ? is it use as an uplink port ? Where does it actually uplink/connect to ?
Q5) If i connect a switch Uplink port to another switch Uplink port, does it means that I have to use a crossover cable ? does SFP fiber come with "crossover" type too ?
============================================================
Q6) If an uplink port in a switch is use to connect to a router (can we?), do i need to use a crossover cable then ? since a normal switch ethernet port will use a straight cable to connect to a router port ? as shown below
SWITCH
ROUTER
SWITCH UPLINK
ROUTER
TX
straight
RX
RX
cross
RX
TX
straight
RX
RX
cross
RX
RX
straight
TX
TX
cross
TX
RX
straight
TX
TX
cross
TX
============================================================
Q7) Last but not least, if a design connect two switches using SFP uplink ports on both side, what would be the main purpose ? to increase the amount of ports ? Why not stack them then ?
Sorry for the lengthy post, will really appreciate if some gurus can shed some light on the above.
Thanks a million.
Regards,
Noob

An uplink port doesn't necessarily run at wire speed but it is more likely to.
But this doesn't mean you don't get oversubscription from the switch to other switches.
It's quite a big subject to cover but i'll try and keep it brief.
Internally within a switch there is a crossbar switch fabric which I think we covered before. Think of it of as pathways between ports. On any switch there are a number of ports that are capable of certain speeds.
Put simply if you take the number of ports on the switch and multiply that by the fastest speed the ports can operate at, if that number is greater than the switch fabric then the switch is said to be oversubscribed.
It doesn't mean in practice it will be oversubscribed but the potential is there.
What can happen though with oversubscribed switches is that the uplinks ports are guaranteed not to be oversubscribed ie. they do not need to contend with the other ports on the switch. It's complicated but it is to do with the connectors per port group etc. to the switch fabric.
But even though the uplinks ports can run at wire speed so they are not oversubscribed, if they are uplinks to other switches there may very well be more traffic combined from the other ports on the switch to that uplink port so you still get an oversubscription ratio.
But what would make it a whole lot worse was if your uplink port was oversubscribed within the switch as well.
So there is oversubscription within the switch and this is where we talk about ports running at wire speed or not and then there is oversubscription between different layers of the network eg. access to distribution for example.
Jon

Connecting Two Power Supplies in one PC

Hello there :hypecrite:
Will someone help me on how to connect two Switching P/S in one PC (If it's possible)?
I tried using two P/S in my old PC and it's working just fine. However, the problem is that I cannot switch them on simultaneously because the one is connected directly to the motherboard and the other, I just used a simple switch to turn it on.
Also, please check my P/S for this PC if it's OK.
Thank you and more POWER!!!
:hypecrite:

Hello again :hypecrite:
Thank you for your support guyz. I would like to tell you that you are all correct.
I think it's time for me to stop fooling aroung, experimenting things, too. And to trust the verdors instead. I looked for the psu brands that you all mentioned and it turned out my pockets could still handle such a cost, eventhough it costs twice as much as the psu that I have right now, but as long as it's dependable.
And about the problem with my CPU's temperature that I posted last November 12, 2004 (MSI KT4A-V with S/PDIF out and Core center), AMD support center finally replied to me and told me that my temp is OK but not to go above 70C.
Below is my inquiry to AMD and their reply:
My inquiry:
Dear Sir:
I would like to ask what is the NORMAL operating temperature of Athlon XP 2400+ FSB 266 model 8?
When my PC is at idle, my CPU temp reading is 60C and during full load, it reaches to about 66C. It doesn't have any problems though (such as random reboot) but I'm a bit concerned of the temperature reading. Some people say that it's a bit TOO HOT for comfort. Still others say that it is OK. What do you think?
I have read your post on MAXIMUM operating temperatures of Athlon XPs but not the recommended NORMAL operating temperatures.
And also when I turn the BIOS CPU core voltage to AUTO mode the default is 1.575V. My friends said the minimal operating voltage of 2400+ is 1.650V. Is it OK to just leave it to default?
Thank you very much
Sincerely,
Mark E. Guillem
Philippines
My PC Specifications:
AMD Athlon XP 2400+ (Family 6, Model 8, Stepping 1), FSB266 256L2
GlobalWin TAK68 CPU fan (dual fan, ball bearing 5200RPM max each)
MSI KT4A-V (VIA KT400 chipset) BIOS ver. 2.3 date: 09092004 (with MSI Core Center)
512MB DDR333 mem (2x256MB)
Inno3D GeForce FX 5200 128MB with AGP8x w/ TV out
80GB Maxtor 7200RPM 1x133
40GB Seagate 5400RPM 1x100
LiteON LDW 411S DVDRW 40x12x40
LITE-ON XJ-HD166S DVDROM 16x
Pinnacle PCI PCTV Rave TV tuner/capture card
OS: Windows XP SP2
The Reply:
Dear Guillem,
Thank you for contacting Asian and Pacific AMD Technical Support Centre.
I can confirm that the temperatures ranges from 40° - 55° C in moderate usage and with a higher workload around 65° C, but never over 70° C.
What the correct voltage is concerned there are three models of the Athlon XP 2400+. If you have the CPU with the OPN AXDA2400DUV3C the
voltage should be 1.60V otherwise it is 1.65V.
It seems your system would overheat dangerously when set to the right voltage. I would suggest, you do check if the heatsink /fan is installed
properly.
You may find a different reading after upgrading your BIOS.
* Please make sure to download the right BIOS version for your motherboard.
Then, please, make sure that your processor Athlon XP 2400+ is configured in BIOS as follows:
- FSB speed to 133MHz (It is a bidirecctional bus, the full speed would be 266)
- CPU multiplier of 15x
- CPU voltage of 1.65V (1.60V if OPN = AXDA2400DUV3C)
With these settings the clock frequency of the processor should be 2000 MHz.
And finally you can test the CPU on another system to establish if the processor or the motherboard is responsible for the problem . If no other system is
available to you then ask your retailer/reseller to test it for you.
Given the case that the processor is faulty, we inform you that the PIB processors (box processors) have 3 years warranty, whilst OEM processors (tray processors) have only one year. In both cases the first year is given by the reseller and the PIB processors second and third years are served directly by AMD.
If you have any further questions, please, do not hesitate to contact us again.
Kind regards,
Roberto Erler
Technical Support Engineer
Spain: 900 99 71 21 (Número Gratuito)
France: 0800 908 621 (Numéro Vert)
Germany: +49 89 450 53199
Italy: 800 877 224
United Kingdom: +44 1276 803 299
Yesterday, I increased the CPU voltage to 1.60V (from the default of 1.575) and my temp reading was reduced to 50C at idle (from an idle of 60C) and at full load to 60C (from a full load of 66C). I was not expecting this though. I was expecting that my CPU's temp will increase further. But this is what happened. I guess the RIGHT THING should be the RIGHT THING.
Tomorrow, I will buy a new psu with the brands that you mentioned and I hope that my PC's stability and performance will increase further.
Again thank you very much for your support and all.
:hypecrite:

Connecting two Cisco 2950 switches to a 2600 router

Hello,
I'm trying to have two LANs connected to 2950 switch each, connect to a 2600 router and have the two LANs communicate with each other...i can't seem to get it working...any help...thanks
LAN 1 192.168.10.1/20
LAN 2 192.168.12.1/21
Thanks again

Alright, these are only basic configs here:
Router
hostname Router
int fastethernet0/0
description Network 1
ipaddress 192.168.10.65 255.255.255.192
int fastethernet0/1
description Network 2
ip address 192.168.10.129 255.255.255.192
end
Switch 1 (the one connecting to f0/0)
hostname SwitchNet1
int f0/1
description Host 1 Net 1
no ip address
no shut
int f0/2
description Host 2 Net 1
no ip address
no shut
int f0/3
description Host 3 Net 1
no ip address
no shut
int f0/4
description Host 4 Net 1
no ip address
no shut
int range f0/5 - 23
no description
no ip address
shut
int f0/24
description UPLINK to Router
no ip address
no shut
int vlan 1
ip address 192.168.10.66 255.255.255.192
no shut
default-gateway 192.168.10.1
end
Switch 2 (the one connecting to f0/1)
hostname SwitchNet2
int f0/1
description Host 1 Net 2
no ip address
no shut
int f0/2
description Host 2 Net 2
no ip address
no shut
int f0/3
description Host 3 Net 2
no ip address
no shut
int f0/4
description Host 4 Net 2
no ip address
no shut
int range f0/5 - 23
no description
no ip address
shut
int f0/24
description UPLINK to Router
no ip address
no shut
int vlan 1
ip address 192.168.10.130 255.255.255.192
no shut
default-gateway 192.168.10.129
end
This config assumes only ports f0/1 - f0/4 will be used on each switch. If that is not the case, you will need to modify the interface configs accordingly. You may want to use descriptions more suited than to your network on the switchports. Also, this config assumes the router is connected to port f0/24 on each switch as well.
The default-gateway for the hosts and the switches is going to be the router IP address for the subnet they are attached to. The hosts/switches attached to f0/0 use 192.168.10.65 as their gateway. The hosts/switches attached to f0/1 use 192.168.10.129 as their gateway.
You do not need to configure a port on the switch as the default-gateway. The default-gateway is an IP address the host/switch uses to direct all traffic from itself out past the router. In fact, if you don't need the switch to talk to devices on the other subnet, you don't even need to configure a default-gateway on the switches (but I would anyway).

Connecting two cisco ESW 500 series switches.

Hi Experts,
I have a basic knowledge of network and need some help.
I have two cisco ESW 500 series switches and i want to connect them together.
Q1 # Which type of cable i should use to connect these two switches CrossOver or fiber...What is the advantage of using Fiber over CrossOver. ?
Q2 # What are the marked ports in the image used for...???

tech spec,
Traditionally you would use crossover to connect switches. Most modern network devices have Auto-MDIX which allows the device to connect using either crossover or straight through.
The ports on the right can be used for uplink or as regular network ports. On the 10/100 versions the ports on the right are usually Gigabit, thus making them more suitable for uplink to another switch, etc.
Please mark this thread as answered or reply if you have any additional questions.
- Marty

Best way to connect 2 Cisco 3750 PoE 24-port Switches

Hello. I have 2 Cisco 3750 PoE 24-port switches in a small office environment. Right now I have a trunk configured off my ASA 5505 to switch 1, and then just an access port configured on a port (switch 1) and an access port configured on a port (switch 2) to connect them together. These switches also have 2 GB SFP ports but they are not being used in this configuration.
I was curious to know if anyone had any better recommend configurations for connecting these 2 switches together? I'm not sure if this particular model can be stacked?

What are the exact model numbers (should be written on a sticker)?
You will know if they can be stacked as you will see the 2x stack ports on the back of each switch :)
If they can then that is probably the way to go unless you want to keep them as separate switches for some reason.
If you want them separate, I would connect them via a Trunk link at least so you can have the same Vlans on both.
Thanks

Cisco 2950 - 3350 Trunking issue - Port not lighting up

Hi There,
I have two switches I am trying to connect a 2950 and a 3350. I have a crossover cable connecting them from fa0/24 to fa0/24 setup as a trunk,
however they won't connect and the port on both switches is down, (e.g no port light coming on on switch)
here is some show commands from both switches.. does anyone know where I am going wrong.. thanks in advance
2950#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
Vlan1                      192.168.0.11    YES NVRAM up                    up
FastEthernet0/1            unassigned      YES unset up                    up
FastEthernet0/2            unassigned      YES unset down                  down
FastEthernet0/3            unassigned      YES unset down                  down
FastEthernet0/4            unassigned      YES unset down                  down
FastEthernet0/24           unassigned      YES unset down                  down
2950#sh vlan
VLAN Name                             Status    Ports
1    default                          active    Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7, Fa0/8, Fa0/9, Fa0/10, Fa0/11, Fa0/12, Fa0/13, Fa0/14, Fa0/15, Fa0/16, Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                                Fa0/21, Fa0/22, Fa0/23, Fa0/24
1002 fddi-default                     act/unsup
1003 token-ring-default               act/unsup
1004 fddinet-default                  act/unsup
1005 trnet-default                    act/unsup
VLAN Type SAID       MTU   Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
1    enet 100001     1500 -      -      -        -    -        0      0
1002 fddi 101002     1500 -      -      -        -    -        0      0
1003 tr    101003     1500 -      -      -        -    -        0      0
1004 fdnet 101004     1500 -      -      -        ieee -        0      0
1005 trnet 101005     1500 -      -      -        ibm -        0      0
Remote SPAN VLANs
Primary Secondary Type              Ports
2950#sh run
Building configuration...
Current configuration : 1278 bytes
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname 2950
enable secret 5 $1$JKXw$gcYpfOaSQRiQqcCuVF5371
ip subnet-zero
ip ssh time-out 120
ip ssh authentication-retries 3
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
interface FastEthernet0/1
interface FastEthernet0/2
interface FastEthernet0/3
switchport mode access
interface FastEthernet0/4
interface FastEthernet0/24
switchport mode access
speed 100
duplex full
interface Vlan1
ip address 192.168.0.11 255.255.255.0
ip http server
line con 0
line vty 0 4
password cisco
login
line vty 5 15
login
end
2950#
3350#sh vlan
VLAN Name                             Status    Ports
1    default                          active    Fa0/1, Fa0/3, Fa0/4, Fa0/5, Fa0/6, Fa0/7, Fa0/8, Fa0/9, Fa0/10, Fa0/11, Fa0/12, Fa0/13, Fa0/14, Fa0/15, Fa0/16, Fa0/17, Fa0/18, Fa0/19, Fa0/20
                                                Fa0/21, Fa0/22, Fa0/23, Fa0/24, Gi0/1, Gi0/2
1002 fddi-default                     active
1003 token-ring-default               active
1004 fddinet-default                  active
1005 trnet-default                    active
VLAN Type SAID       MTU   Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
1    enet 100001     1500 -      -      -        -    -        0      0
1002 fddi 101002     1500 -      -      -        -    -        0      0
1003 tr    101003     1500 -      -      -        -    -        0      0
1004 fdnet 101004     1500 -      -      -        ieee -        0      0
1005 trnet 101005     1500 -      -      -        ibm -        0      0
Remote SPAN VLANs
Primary Secondary Type              Ports
3350#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
Vlan1                      192.168.0.12    YES NVRAM up                    up
Vlan200                    unassigned      YES NVRAM down                  down
FastEthernet0/1            unassigned      YES unset down                  down
FastEthernet0/2            unassigned      YES unset up                    up
FastEthernet0/3            unassigned      YES unset down                  down
FastEthernet0/24           unassigned      YES unset down                  down
GigabitEthernet0/1         unassigned      YES unset down                  down
GigabitEthernet0/2         unassigned      YES unset down                  down
3350#sh run
Building configuration...
Current configuration : 1728 bytes
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
hostname 3350
enable secret 5 $1$ojzz$X.gjyIj/4JDGAUDXYP5ie1
ip subnet-zero
ip routing
spanning-tree mode pvst
spanning-tree extend system-id
interface FastEthernet0/1
no ip address
interface FastEthernet0/2
no ip address
interface FastEthernet0/3
switchport mode access
no ip address
interface FastEthernet0/24
switchport trunk encapsulation dot1q
switchport mode trunk
no ip address
duplex full
speed 100
interface GigabitEthernet0/1
no ip address
interface GigabitEthernet0/2
no ip address
interface Vlan1
ip address 192.168.0.12 255.255.255.0
interface Vlan200
no ip address
ip classless
ip http server
line con 0
line vty 0 4
password cisco
login
line vty 5 15
login
end
3350#

Hi Karthick,
I had a look under the interface however I don't appear to have any command for mdix-auto?
2950(config-if)#?
Interface configuration commands:
arp                 Set arp type (arpa, probe, snap) or timeout
bandwidth           Set bandwidth informational parameter
carrier-delay       Specify delay for interface transitions
cdp                 CDP interface subcommands
channel-group       Etherchannel/port bundling configuration
channel-protocol    Select the channel protocol (LACP, PAgP)
default             Set a command to its defaults
delay               Specify interface throughput delay
description         Interface specific description
dot1x               Interface Config Commands for 802.1x
down-when-looped    Force looped interface down
duplex              Configure duplex operation.
exit                Exit from interface configuration mode
fair-queue          Enable Fair Queuing on an Interface
help                Description of the interactive help system
hold-queue          Set hold queue depth
ip                  Interface Internet Protocol config commands
keepalive           Enable keepalive
lacp                LACP interface subcommands
load-interval       Specify interval for load calculation for an interface
logging             Configure logging for interface
mac-address         Manually set interface MAC address
macro               Command macro
mls                 mls interface commands
mvr                 MVR per port configuration
no                  Negate a command or set its defaults
pagp                PAgP interface subcommands
random-detect       Enable Weighted Random Early Detection (WRED) on an
                      Interface
rmon                Configure Remote Monitoring on an interface
shutdown            Shutdown the selected interface
snmp                Modify SNMP interface parameters
spanning-tree       Spanning Tree Subsystem
speed               Configure speed operation.
storm-control       storm configuration
switchport          Set switching mode characteristics
timeout             Define timeout values for this interface
transmit-interface Assign a transmit interface to a receive-only interface
tx-ring-limit       Configure PA level transmit ring limit
udld                Configure UDLD enabled or disabled and ignore global UDLD
                      setting
2950(config-if)#

Cisco 2950 - 24 WS switch express install issue

Hi Guys,
Got a Cisco 2950 24 port switch that I need to setup and I can't seem to get the page for Express install
In firefox when trying to connect to 10.0.0.1 I get the message "connection was reset" in internet explorer "page cannot be displayed"
when doing a arp -a I can see that the switch does get the IP address 10.0.0.1 and I can also ping the switch ok.
Have followed the instructions and reset the switch and all the mode lights are green etc.
my ethernet adapter does get the address 10.0.0.2 given from the switch (however connectivity is limited / not sure if this is supposed to be like this or not)
have tried earlier versions of firefox (even 1x 2x 3x 4x) etc and also older versions of IE incase there is something weird going on there. have also tried using a mac and trying safari which gives similar results.
So i think the http server is enabled on the switch, as it should be by default when it is reset etc. according to cisco's documentation.
I know using the console cable would be alot easier however I don't have one available and not easy for me to get
any ideas? has anyone ever successfully been able to use this express install web page on a cisco 2950 before? It has Version 12.1(22)EA14 so express install should work on this switch!
cheers,

managed to get hold of a console cable. checked switch and http-server command was enabled so have no idea why this feature was not working...
did some research and someone suggested that it is fussy with the version of java you are running on the pc ( requires old version of java?) .. possibly that may have an influence who knows?
Think ill just carry around a Console cable in future!

Cisco 2950 MT-RJ ports - Connect two switches?

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