Interconnecting Catalyst 3750 and 2948G-L3
I am trying to interconnect a Catalyst 3750 and a 2948G-L3 using fiber GBIC. The interfaces where the GBIC and fiber are attached show up as physically down. I have tried different ports and also changed both switches. No Luck. If I connect a 3524 to the 3750 using the same connection it works.
Are 2948G-L3 switches compatible with the 3750?
Thanks,
VT
Should have no problem. Can you try the following on the 3750's gig interface:
speed nonegotiate
See of the link comes up.
Please rate all posts.
Similar Messages
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Trying to interconnect Catalyst 3750 with cwdm sfp module
hi,
I try to interconnect 2 Catalyst 3750 switch use cwdm sfp fiber module.
If just plug in, there is no link between 2 switchs.
What's the procedure to make this?
Thanksyou have 2 options with CWDM at the moment. the first option is to use any or all to the 8 wavelenght SFPs: CWDM-SFP-1470= (gray) thru CWDM-SFP-1610= (brown)
with passive multiplexers (MUX) as described here:
http://www.cisco.com/en/US/products/hw/modules/ps5455/products_data_sheet09186a00801a557c.html
or
In the off chance you have only a single strand of fiber available, you would choose:
1000BASE-BX10-D AND 1000BASE-BX10-U SFP FOR SINGLE-FIBER BIDIRECTIONAL APPLICATIONS
as described here:
http://www.cisco.com/en/US/products/hw/modules/ps5455/products_data_sheet0900aecd8033f885.html
Overall, CWDM is a cost effective method of building a Metro-Ethernet LAN / SAN by providing a single pair of single mode fiber the ability to support 8 wavelengths. You can mix and match these wavelengths with 1Gb Ethernet or 2Gb FiberChannel as needed.
rate if helpful
thanks, -
Can you tell me if your Catalyst 3750 switch (*not* the –E or –X variants) support VRRP ipv4? If so what version of firmware do I need?
Thanks - WaltWalt
Support for VRRP was added in version 12.2(58)SE.
See this link for details -
http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3750-series-switches/product_bulletin_c25-658743.html
Jon -
Disable Multicast MAC Addr restricted in Catalyst 3750 and C3560G
Hi All,
I'm using Cisco 3750 Catalyst and C3560G, recent days ago i purchased a pair of WatchGuard Firewalls and put in the system to run HA Active/Active model.
The requirement to run WatchGuard Firewall HA A/A model is to allow ARP request if the response contains a multicast MAC Address in Routers and Switches.
I read somewhere that Routers and layer 3 switches, the default behavior is to follow RFC 1812, which says that the routers must not believe any ARP reply that claims that the link later address of another host or router is a broadcast or multicast address.
Can you pl show me the command to Allow all Multicast MAC Address for interfaces? Or disable RFC 1812 in order to get WatchGuard Firewall works properly.
Here is the information from WatchGuard firewall: "When you configure WatchGuard FireCluster in an active/active configuration, the cluster uses multicast MAC addresses for all interfaces that send network traffic. Before you enable FireCluster, make sure your network switches, routers, and other devices are configured to route network traffic with multicast MAC addresses.
Pl help. Thanks.Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
My experience on 3750 has been generally only a reload will clear the detailed MLS QoS stats.
However, I thought could could clear the interface stats, although, if not, might be a bug in your IOS version (you didn't note actual 3750 model or specific IOS version being used).
Lastly, the interface stats don't clear at all? Reason I ask, disabling QoS doesn't preclude you still getting drops. -
Catalyst 3750 and jumbo frames
We're looking to implement a gigabit segment with a 3750 switch, with the latest apple imac G5 clients connected and and an xserve G5 connected doing link aggregation using a 4 port smalltree NIC.
Although the Xserve supports jumbo frames i believe the imac NICs DON'T support jumbo frames although the operating system does( the imac NICs DO support 1000T ) Ideally we'd want the 3750 switch to be configured for Jumbo frames. The 3750 switch we've chosen has all ports of 10/100/1000T with the SMI, so all ports will have the MTU set at 9000 if we enable jumbo.
Although the Xserve will be fine, i'm worried about traffic that ingresses from the xserve and egresses out to a 10/100/1000 port to which an imac is connected which i believe does not support Jumbo frames. What are the issues in terms of connectivity and dropped packets for an imac G5 connected to a 3750 ?
seeing as the MTU is set globally and all our ports are gigabit, and machines will be connected to these ports that don't support jumbo but are advertised as having 'gigabit capability'
Sorry if these sounds like an incoherent rant, but i needed to provide as much info as possible. Help much appreciatedjust to add, in comparison HP gigabit switches can do jumbo vlan on a per vlan and per port basis it's a shame the 3750 can't do that
-
Hello. We have the next Settings in our SW. We crate an ACL and aplied to a SVI for Incomming Traffic, I understand that is not necesasry to allow the returning traffic in ACL, but we can't access to rdp for example when we add the ACL, if we remove it, the acces is ok, buet when we add again the access is deny, even we have a log entry, and the ACL i just for Incomming traffic. There is no another ACL. What should we check? What are we missing here?
Please see attached file
Thanks in Advance
interface Vlan64
ip address 10.147.64.254 255.255.255.0
ip access-group 134 in
access-list 134 permit udp any any eq bootpc log
access-list 134 permit udp any any eq bootps log
access-list 134 permit ip any 172.30.146.0 0.0.0.255
access-list 134 permit ip any 172.23.146.0 0.0.0.255
access-list 134 permit ip any 10.146.137.0 0.0.0.63
access-list 134 permit ip any 10.146.137.128 0.0.0.63
access-list 134 permit ip any host 10.146.81.240 log
access-list 134 permit ip any host 10.146.46.250
access-list 134 permit ip any host 10.146.46.157
access-list 134 permit ip 10.147.64.0 0.0.0.255 host 10.146.46.228
access-list 134 permit ip 10.147.64.0 0.0.0.255 host 10.146.137.99
access-list 134 deny ip any 192.168.0.0 0.0.255.255
access-list 134 permit tcp any host 172.27.72.27 eq www
access-list 134 deny ip any 172.16.0.0 0.15.255.255
“The next entry generates a log when I try RDP from 10.146.40.29 to 10.147.64.39”
access-list 134 deny ip any 10.0.0.0 0.255.255.255 log
access-list 134 deny ip any host 98.139.60.248 log
access-list 134 permit ip any any
access-list 134 permit icmp any any
"This is the log showed"
25w6d: %SEC-6-IPACCESSLOGP: list 134 denied tcp 10.147.64.38(3389) -> 10.146.40.
29(1150), 1 packetWhat you are missing is a statement in the access list to permit traffic to the subnet of 10.146.40.0. Since there is no statement to permits this traffic then the line access-list 134 deny ip any 10.0.0.0 0.255.255.255 log denies the traffic as it should.
To fix this problem you need to add a statement in the access list before that line to permit the traffic. The line might look something like this:
access-list 134 permit ip any 10.146.40.0 0.0.0.255
HTH
Rick -
Fast EtherChannel between Catalyst 3750 and 2821 Router
Hi Guys
I'm trying to setup a Fast EtherChannel between a cat3750-smi and a 2821 router that consists of only 2 links.
I am following instructions per TAC, but I'm getting an error along the way;
On the cat3750:
interface port-channel 1
no switchport
Command Rejected: Not a convertable port
Can anyone help???
Also... do the IP Addresses for the EtherChannel need to be the same for both port-channels? Or do I assign the switch like 192.168.1.1 and the router 192.168.1.2 ?
Thanks!
AdamHi Adam,
The ip address cannot be same but it should belong to same subnet. So one side 192.168.1.1 and other side 192.168.1.2 will work fine.
Its better to convert your layer 2 port as a layer port fist so what you do the port which you want to be port channel go that that interface and convert with "switchport" command
once it is a layer 3 port configure with channel group and automatically layer 3 port channel will be created and you can sssign an ip address then.
Just give a try and update if it works.
Regards,
Ankur -
Catalyst 3750x and 4510R and Cisco Security Manager
Hi,
I just downloaded and install trial (evaluation) version of Cisco Security Manager 4.3. In supported devices list I saw Cisco Catalyst 3750 and 4510R but when I try to add it I got for 3750:
Invalid device: Device is a switch and cannot be mapped to a Generic Router model.
Please verify the selected device type, OS version and device configuration
For 4510R:
Invalid device: Version 03.03.00.SG (N/A) is not supported for the device type of Cisco Catalyst 4510R Switch Please verify the selected device type, OS version and device configuration
We need to make a purchase decision but for it we need to import all of our devices and perform some tests.
Thanks in advance for your replies!
BR, Vasily.I figured this out on my own -- change Compatibility mode of the installer to be Windows 8 (which is same OS version as Windows 2012) and it installs just fine.
-
Trunking between Huawei S3900 and Cisco catalyst 3750
One of my edge Huawei S3700 switches is dead, I am going to replace it with a Cisco switch Catalyst 3750 series PoE-48 via a trunk link with GE fiber port on both ends, please see the diagram below.
trunk trunk
Core switchrouter<----------S3700<--------------->Cisco Catlyst 3750
I haven’t touch Cisco switch for many years, I would like to ask the following questions:
1.) Do I need to take any precaution before connecting this Cisco switch into my Huawei network? Only one link between S3700 and C3750, so I don't need worry anout STP? Do I need to worry about Default vlan regarding trunking port?
2.) I need to use different trucking protocol e.g. 802.1Q etc to interconnect these two switches (S3700-28TP-SI-AC and Catalyst 3750), please see the following configuration:
For C3750:
switchport trunk encapsulation dot1q
switchport trunk native vlan (What you want)
switchport trunk allowed vlan (VLANs required)
switchport mode trunk
spanning-tree portfast trunk
For S3700:
port link-type trunk
port trunk permit vlan all
Do you think the configurations above are right?
Do I need to manually enter Duplex and speed options ?
3.)If the configurations are not right, then what are the commands for trucking port/link should I use on the Cisco switch (it uses IOS software) and Huawei switch? Procedures of the commands would be really helpful !
Any information and help would be much appreciated.
Thanks
RegardsHello
3750 - basic config
================
See as you are using this switch as an host switch you need to make sure ip routing isn't enabled ( it isn't by default)
Also it looks like the s3700 Huawei switch is permitting all vlans and I assuming the default native vlan is 1 ( as is cisco) so no need to specify the native either.
If you are requiring the access ports on this new cisco 3750 to be in multiple vlans then usually cisco to cisco interconnect would ultise VTP for vlan propagation however this wont occur between the Huawei switch, so you will need to manually add the vlans on the switch also.
so to summarize below is a basic host switch config for 3750.
conf t
no ip routing
hostname XXXXXX
username xxxx privilege 15 secret xxxxxxx
service password-encryption
enable secret xxxxx
security passwords min-length xx
security authentication failure rate xx log
aaa new-model aaa authentication login default local
logging buffered 4096
no service udp-small-servers
no service tcp-small-servers
service timestamps debug datetime msec localtime
service timestamps log datetime msec localtime
no ip domain-lookup
spanning-tree mode rapid-pvst
spanning-tree portfast bpduguard default
int vlan x ( this may or not be vlan 1 - its whatever the L3 vlan interface is on the core switch for management connectivity)
ip address x.x.x.x y.y.y.y.
exit
ip default-gateway x.x.x.x ( ip address of CORE SVI management interface)
vlan x,x,x,x ( add the L2 vlans to the switch as vtp would not be used between the Huawei switch)
exit
int gigx/x
Description Link to Huawei switch
switchport trunk encapsulation dot1q
switchport mode trunk
switchport nonegotiate
no shut
( no need for spanning-tree portfast trunk- this is usually only for ESX host ports)
int rang fa0/1 -48
Description - Access-ports
switchport host
switchport access vlan x (wihout this defaults to vlan 1)
no shut
clock timezone gmt 0
ntp peer
ntp server x.x.x. prefer
res
Paul -
Catalyst (3750 24 10/100/1000T) and (3750 12 SFP) Stacking Problems
Dear all
I'm having a very strange situation here (at least for me)
we have 4 core switches
2 x WS-C3750G-24T-S Catalyst 3750 24 10/100/1000T + IPB Image
and
2 x WS-C3750G-12S-S Catalyst 3750 12 SFP + IPB Image
Stack configuration is done this way
when the switches are powered on, the first two SFP core switches are seen as a single stack with the stack master LED turned green on the first switch
the other two (24 10/100/1000T) switches have the RPS LEDs always green, mode cannot be changed, and cannot be accessed by Console connection
but when the (24 10/100/1000T) are powered off, the first (SFP) switch in the stack reports that " Switch 3 and 4 has been removed from Stack "
which means they are stacked but there's something wrong, because
only the SFP ports are shown in the " Show interfaces status " , the ethernet ports of the bottom switches are not present !!!
can you please tell me what's the poblem ?Dear Daniel
Sorry for my delayed response but i was actually quite busy
but the problem was actually in another sense
the default profile for the Catalyst 3750 SFP is the Aggregate SDM Template
while the 3750 10/100/1000 ethernet Switch Default SDM profile was Desktop profile
so i had an SDM mismatch
DATACENTER#sh switch detail
Switch/Stack Mac Address : 081f.f3cf.1c80
H/W Current
Switch# Role Mac Address Priority Version State
*1 Master 081f.f3cf.1c80 1 0 Ready
2 Member 081f.f3cf.5900 1 0 Ready
3 Member aca0.16ac.0180 1 2 SDM Mismatch
4 Member aca0.16a3.bc80 1 2 SDM Mismatch
Stack Port Status Neighbors
Switch# Port 1 Port 2 Port 1 Port 2
1 Ok Ok 2 4
2 Ok Ok 3 1
3 Ok Ok 4 2
4 Ok Ok 1 3
all i did was changing the default profile of the SFP switches into the Desktop Profile and problem was solved
switch 1 provision ws-c3750g-12s
switch 2 provision ws-c3750g-12s
switch 3 provision ws-c3750g-24t
switch 4 provision ws-c3750g-24t
system mtu routing 1500
ip subnet-zero
no file verify auto
spanning-tree mode pvst
spanning-tree extend system-id
vlan internal allocation policy ascending
interface GigabitEthernet1/0/1
interface GigabitEthernet1/0/2
interface GigabitEthernet1/0/3
interface GigabitEthernet1/0/4
interface GigabitEthernet1/0/5
interface GigabitEthernet1/0/6
interface GigabitEthernet1/0/7
interface GigabitEthernet1/0/8
interface GigabitEthernet1/0/9
interface GigabitEthernet1/0/10
interface GigabitEthernet1/0/11
interface GigabitEthernet1/0/12
interface GigabitEthernet2/0/1
interface GigabitEthernet2/0/2
interface GigabitEthernet2/0/3
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet2/0/4
interface GigabitEthernet2/0/5
interface GigabitEthernet2/0/6
interface GigabitEthernet2/0/7
interface GigabitEthernet2/0/8
interface GigabitEthernet2/0/9
interface GigabitEthernet2/0/10
interface GigabitEthernet2/0/11
interface GigabitEthernet2/0/12
interface GigabitEthernet3/0/1
interface GigabitEthernet3/0/2
interface GigabitEthernet3/0/3
interface GigabitEthernet3/0/4
interface GigabitEthernet3/0/5
interface GigabitEthernet3/0/6
interface GigabitEthernet3/0/7
interface GigabitEthernet3/0/8
interface GigabitEthernet3/0/9
interface GigabitEthernet3/0/10
interface GigabitEthernet3/0/11
interface GigabitEthernet3/0/12
interface GigabitEthernet3/0/13
interface GigabitEthernet3/0/14
interface GigabitEthernet3/0/15
interface GigabitEthernet3/0/16
interface GigabitEthernet3/0/17
interface GigabitEthernet3/0/18
interface GigabitEthernet3/0/19
interface GigabitEthernet3/0/20
interface GigabitEthernet3/0/21
interface GigabitEthernet3/0/22
interface GigabitEthernet3/0/23
interface GigabitEthernet3/0/24
interface GigabitEthernet4/0/1
interface GigabitEthernet4/0/2
interface GigabitEthernet4/0/3
interface GigabitEthernet4/0/4
interface GigabitEthernet4/0/5
interface GigabitEthernet4/0/6
interface GigabitEthernet4/0/7
interface GigabitEthernet4/0/8
interface GigabitEthernet4/0/9
interface GigabitEthernet4/0/10
interface GigabitEthernet4/0/11
interface GigabitEthernet4/0/12
interface GigabitEthernet4/0/13
interface GigabitEthernet4/0/14
interface GigabitEthernet4/0/15
interface GigabitEthernet4/0/16
interface GigabitEthernet4/0/17
interface GigabitEthernet4/0/18
interface GigabitEthernet4/0/19
interface GigabitEthernet4/0/20
interface GigabitEthernet4/0/21
interface GigabitEthernet4/0/22
interface GigabitEthernet4/0/23
interface GigabitEthernet4/0/24
that's it !
: D
cheers -
Debian Linux Bonding and Cisco Catalyst 3750 - best practise?
Hello everybody,
I would like to know what's best practice to do this:
The two NICs of a Debian Linux server wants to be connected with two Switchports of a Cisco Catalyst 3750 switch(stack). My goal is to have load-balancing and failover.
My /etc/network/interfaces looks like this:
iface bond0 inet static
address 192.168.0.30
netmask 255.255.255.0
network 192.168.0.0
broadcast 192.168.0.255
gateway 192.168.0.1
dns-nameservers 192.168.0.10 192.168.0.20
dns-search xyz.mycompany.com
slaves eth0 eth1
bond_mode ???
bond_miimon 100
bond_downdelay 200
bond-updelay 200
First question: What bond mode should I use?
The switchports looks like this:
interface GigabitEthernet3/0/4
switchport access vlan 20
switchport mode access
spanning-tree portfast
What changes are necessery here? Something like this?
interface GigabitEthernet3/0/4
switchport trunk encapsulation dot1q
switchport mode trunk
spanning-tree portfast
Thanks a lot for suggestions, hints, etc.! :-)
Greets
StephanHi Michael,
thanks a lot for your answer - and sorry for my late reply!
I like to show you my solution - I hope that it is a solution. ;-)
My config on the switch(stack):
switch#show etherchannel summary
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
2 Po2(SU) LACP Gi3/0/3(P) Gi4/0/3(P)
switch#show running-config interface GigabitEthernet 3/0/3
Building configuration...
Current configuration : 172 bytes
interface GigabitEthernet3/0/3
description myserver, eth0
switchport access vlan 20
switchport mode access
channel-group 2 mode active
spanning-tree portfast
end
lansw01#show running-config interface GigabitEthernet 4/0/3
Building configuration...
Current configuration : 172 bytes
interface GigabitEthernet4/0/3
description myserver, eth1
switchport access vlan 20
switchport mode access
channel-group 2 mode active
spanning-tree portfast
end
switch#show running-config interface port-channel 2
Building configuration...
Current configuration : 82 bytes
interface Port-channel2
switchport access vlan 20
switchport mode access
end
The /etc/network/interfaces of my Debian machine looks like this:
auto lo
iface lo inet loopback
auto bond0
iface bond0 inet static
address 192.168.1.xxx
netmask 255.255.255.0
gateway 192.168.1.xxx
dns-nameservers 192.168.1.xxx
dns-search xxx.xxx.xxx
bond-mode 4
bond-miimon 100
bond-downdelay 200
bond-updelay 200
bond-lacp-rate 1
slaves eth0 eth1
This setup seems to work well. But I'm wondering that there is nothing with "trunking" in my setup. Would you like to give me your opinion about this?
Thanks a lot and many greets
Stephan -
Revised Visio stencils for CRS and Catalyst 3750
We just submitted the CRS and Catalyst 3750 revisions to the Cisco web team for posting. They should be available within a day or so.
Regards,
Brett Newman
Cisco Visio Development
Visimation Inc.Hi Kevin,
We updated the 3750 on 2/23/12 and the CRS on 2/20/12. Please check the download page.
Regards,
Brett Newman
Cisco Visio Development
Visimation Inc. -
Catalyst 3560 vs. Catalyst 3750 - 24 and 48p. 10/100/1000
I need some help in positioning the Catalyst 3560 against the Catalyst 3750 - (only 24 and 48p. 10/100/1000) Switches.
Under which circumstances should our customer buy 3560 and what are the arguments for the 3750 solution ?
What are the major differences ?
Thank you very much for your help !
Regards,
CopeCAT3750 series support stackwise technology while 3560s do not. This is the main difference between 3560s and 3750s. The switching architecture between the two is very similar. Stackwise comes with lot of advantages. You can find more on CCO at
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_white_paper09186a00801b096a.shtml -
Catalyst 3750 , ACS and Downloadable IP ACL
Hi,
We installed a ACS v4.1 , we were trying to limit the access to authenticated users by using Downloadable IP ACL in a Catalyst 3750 with IOS version ipbasek9-mz.122-25.SEE4. The authentication part works fine with a external database (Wins AD) , but we want to limit the access to the network of some groups.
This can be done using Downloadable IP ACL ?
Thanks for any helpYes, DACL's can be user here. To use a downloadable IP ACL on a particular AAA client, the AAA client must:
.Use RADIUS for authentication.
.Support downloadable IP ACLs.
Examples of Cisco devices that support downloadable IP ACLs are:
.PIX Firewalls
.VPN 3000-series concentrators, ASA and PIX devices
.Cisco devices running IOS version 12.3(8)T or greater
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_soft/csacs4nt/acs
40/user/c.htm#wp696809
Please note that downloadable ACLs are not supported on cat based switches.
If downloadable ACL's through shared profile doesn't work, define a cisco av-pair to create the downloadable acls.
Give this a try and see if it works. The format for the av-pair ACL is:
ex
ip:inacl#1=permit ip 1.1.1.0 0.0.0.255 9.9.9.0 0.0.0.255
Regards,
~JG
Do rate helpful posts. -
Do Cisco router 2811 and Catalyst 3750 support SNMPv3?
Hi,
Do Cisco router 2811, IOS 12.4(20)Ti, and Catalyst 3750, IOS 12.2.(53)SE, support SNMPv3?
Attached file contains my SNMPv3 configurations and "show snmp" results. Would you please give me your advice? Thanks.
HughHugh
Certainly both the 2811 and the 3750 do support SNMPv3. So support for the feature is not an issue in your situation.
I have looked at the config that you attached and believe that it looks reasonable. You have not told us about the SNMP server that will communicate with these devices. So we have no way to know if the details of the configuration are correct.
Have you attempted to discover these devices with an SNMP server that is configured to use SNMPv3 and has this user and passwords configured? If it does not work my first suggestion would be to check to verify that the passwords configured are exactly the same on the clients and on the server (and perhaps re-configure the passwords just to be sure). If the passwords are not a problem my second suggestion would be to check and verify that the authentication and encryption parameters match between the server and the clients.
HTH
Rick
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