Configuring a Catalyst 3750
I want to configure a route between Port1 and Port2 and another route between Port3 and Port4 of the catalyst 3750. Is that possible and how can I do this?
Configure the ports to be layer 3 just like any other router. But, you might be better off creating SVI or interface vlan and assign the ports to accordingly to the SVI and just enable ip routing which should be enabled by default.
Similar Messages
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MPLS Configuration Problem- Catalyst 3750
We have a difficulty enabling the MPLS on this particular switch. We couldn't find the command for the MPLS to enable in the interface. Is there any command or substitute command to do this? The following information was taken from the switch.
Device details:
Cisco IOS Software, C3750 Software (C3750-IPSERVICES-M), Version 12.2(25)SEE2, RELEASE SOFTWARE (fc1)
System image file is "flash:c3750-ipservices-mz.122-25.SEE2/c3750-ipservices-mz.122-25.SEE2.bin"
cisco WS-C3750-24P (PowerPC405) processor (revision K0) with 118784K/12280K bytes of memory.If I understand I don't need to configure trunk in physical interface:
The correct configuration is:
interface Port-channel1
switchport trunk encapsulation dot1q
switchport mode trunk
interface GigabitEthernet1/0/1
channel-group 1 mode active
interface GigabitEthernet1/0/2
channel-group 1 mode active -
Configuring dual-links on catalyst 3750
I've dual-links (laser and Fiber optic media) to connect my office and colocation. both of using catalyst 3750, there are also 4 VLAN. the problem are Fiber optic provider only allow 1 VLAN to connect my network to colocation, when the Laser drop, Fiber optic can't send traffic to colocation.
is there any clue for this problem...?
thanks,Hey,
Please give the Show config output from both the switches. Would like to see the config on both the ends.
regards,
-amit singh -
Password problem on Catalyst 3750
Hi all,
I am an Unix administrator and we lost all account and password informations to connect on a Catalyst 3750 switch.
Is there a way to connect to the switch (With a serial cable?) an to create a new account without losing the configuration ?
Thank's for your reply.
Regards.This method won't reset the configuration.
During the boot process, you rename the current configuration so it doesn't get loaded.
rename flash:config.text flash:config.old
When the switch boots, it loads a blank image. Then you rename the config file and load it into the running config and you can change the logon credentials to something you know.
It's important that you follow the steps exactly so you don't lose the configuration. Password recovery is a pretty common procedure.
The only other method of recovery is if you have a copy of the current running configuration. Send me a private message if you have this config and we can discuss the possibility. -
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 -
Policer with IPv6 class-map on Catalyst 3750
Hi,
I've the following problem.
It's my goal to ratelimit incoming IPv6 traffic dependent on the destination IP address range.
On a Catalyst 3750 (Image: c3750-ipservicesk9-mz.122-55.SE1.bin) I've set up the configuration as follows:
mls qos
ipv6 access-list DESTINATION-RANGE-A
permit ipv6 any 2007::/16
ipv6 access-list DESTINATION-RANGE-B
permit ipv6 any 2B03::/16
class-map match-all A
match access-group name DESTINATION-RANGE-A
class-map match-all B
match access-group name DESTINATION-RANGE-B
policy-map RL-POLICY
class A
police 2000000 8000 exceed-action drop
class B
police 6000000 8000 exceed-action drop
interface GigabitEthernet1/0/7
switchport access vlan 90
load-interval 30
service-policy input RL-POLICY
The last CLI command which should bind the policy to the specific interface, leads to the following error message
QoS: class(A) IPv6 class not supported on interface GigabitEthernet1/0/7
Are hardware/software limitations the reason for this behavior or is there any misconfiguration?
Thanks in advance for your help!
Regards,
JensIf you are thinking of IPv6 prefix I tried everything. From /128 for single host to /64, nothing works.
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Ratelimiter with IPv6 class-map on Catalyst 3750
Hi,
I've the following problem.
It's my goal to ratelimit incoming IPv6 traffic dependent on the destination IP address range.
On a Catalyst 3750 (Image: c3750-ipservicesk9-mz.122-55.SE1.bin) I've set up the configuration as follows:
mls qos
ipv6 access-list DESTINATION-RANGE-A
permit ipv6 any 2007::/16
ipv6 access-list DESTINATION-RANGE-B
permit ipv6 any 2B03::/16
class-map match-all A
match access-group name DESTINATION-RANGE-A
class-map match-all B
match access-group name DESTINATION-RANGE-B
policy-map RL-POLICY
class A
police 2000000 8000 exceed-action drop
class B
police 6000000 8000 exceed-action drop
interface GigabitEthernet1/0/7
switchport access vlan 90
load-interval 30
service-policy input RL-POLICY
The last CLI command which should bind the policy to the specific interface, leads to the following error message
QoS: class(A) IPv6 class not supported on interface GigabitEthernet1/0/7
Are hardware/software limitations the reason for this behavior or is there any misconfiguration?
Thanks in advance for your help!
Regards,
JensIf you are thinking of IPv6 prefix I tried everything. From /128 for single host to /64, nothing works.
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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 -
Catalyst 3750 Ingress SPQ/SRR behavior
Do Cisco engineers review this community at all?
I am working on the latest version of QoS standard for our Enterprise and noticed the following conflicting information officially provided by Cisco.
My question relates to ingress/pre-ring Strict Priority Queue (SPQ) logic.
Cisco Catalyst 3750 QoS Configuration Examples document states that SPQ on ingress is configured and serviced as follows
mls qos srr-queue input priority-queue 2 bandwidth 10
mls qos srr-queue input bandwidth 90 10
SPQ services Q2 up to the configured 10% of ingress bandwidth
Any excessive traffic in Q2 is not dropped, but is serviced by SRR in accordance with the configured weights
For example, a momentary 5Gbps of aggregated ingress EF traffic will be serviced in the following way
SQP services 10% of total ring's bandwidth, or 3.2Gbp, leaving 1.8Gbps for SRR processing
SRR services excessive 1.8Gbps in accordance w/ weights Q1 - 90 and Q2 - 10, such as Q1 gets 25.92Gbps and Q2 get 2.88Gbps more.
The following pictures provides in-depth look into Ingress queuing logic.
Alternatively, Cisco Medianet Campus Design v4.0 provides the following example w/ comments
C3750-E(config)#mls qos srr-queue input priority-queue 2 bandwidth 30
! Q2 is enabled as a strict-priority ingress queue with 30% BW
C3750-E(config)#mls qos srr-queue input bandwidth 70 30
! Q1 is assigned 70% BW via SRR shared weights
! Q2 SRR shared weight is ignored (as it has been configured as a PQ)
Basically, they now say Q2 bandwidth weight is ignore because it is configured as Strict Priority Queue. Doesn't it look contradictory?
In my humble opinion Medianet (or SRND v4.0!!!) provides an incorrect information re ingress queuing on Catalyst 3750 platform.
I am not sure I can easily test it, providing that an internal ring must experience a congestion. I don't think I can send more than 32Gbps of traffic into any of my lab 3750 switches.
Also, I don't think this mistake can be critical in my environment as I don't expect to have momentary full capacity load on those... but it can be critical for others.
Much appreciate
Tim -
/31 on Catalyst 3750 routed port
I've discovered the feature 'Using 31-Bit Prefixes on IPv4 Point-to-Point Links' and I'm interested in implementing it on a point-to-point uplink network that terminates on one end to a Catalyst 3750 routed FastEthernet port ("no switchport").
I can enter the IP address in the interface config (172.16.100.0 255.255.255.254), and I get the warning "% Warning: use /31 mask on non point-to-point interface cautiously". Since I can guarantee that this is in fact a point-to-point uplink to a Layer 3 device, can I safely ignore the warning? Is there any way to configure the interface explicitly as a Point-to-Point interface instead of a broadcast interface?
Thanks!
-MasonHi,
It doesn't appear the error is platform specific. I am getting the same error in my lab 2600 when configuring a /31 bit mask.
You would use the /31 bit mask only on a p-t-p interface hence, you don't need to tell the interface it's a p-t-p interface. I don't know of any generic command to tell the broadcast interface that it's a p-t-p interface. There is a OSPF command but that doesn't have anything to do with this setup.
R2(config)#int e0/0
R2(config-if)#ip add 1.1.1.0 255.255.255.254
% Warning: use /31 mask on non point-to-point interface cautiously
R2(config-if)#^Z
R2#show run
*Mar 1 18:20:21.795: %SYS-5-CONFIG_I: Configured from console by console int e
/0
Building configuration...
Current configuration : 78 bytes
interface Ethernet0/0
ip address 1.1.1.0 255.255.255.254
half-duplex
end
R2#show ip arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 1.1.1.0 - 0004.dd85.eee0 ARPA Ethernet0/0
R2#ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
Success rate is 80 percent (4/5), round-trip min/avg/max = 1/3/4 ms
R2#show ip arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 1.1.1.1 0 0004.dd85.e9c0 ARPA Ethernet0/0
Internet 1.1.1.0 - 0004.dd85.eee0 ARPA Ethernet0/0
HTH
Sundar -
Catalyst 3750 interface explaination
Dear Sir,
I don't understand as follows :-
1.) why on Catalyst3750 interface fastethernet 1/0/1 ?? <--- what's the meaning of 1/0/1 ?
2.) what's the meaning of no mdix auto?
Please explain and advise.
Thank you.The 3750 has many interesting features, I recommaned you go through before you connect your switches in a production environment.
Basically, you should provision your stack master with the number of switches and their types. You could provision as well the interfaces with their corresponding configurations, even though the other elements are still not connected yet. This way, you ensure, when you add a provisioned element with the right number, it will take exactly the provisioned configuration you've already set on the master,... as well when changing an element with an other, when moving it,... you will have just to provision its number and then connect it to the stack while is not yet powered on.
Second, it is recommanded to set priority to each element, this way you will have a deterministic configuration and you know in advance which one will be reelected as master in any sitution.
If no provision is set on the stack master, when you connect a switch, it has by default the number "1", in this case the newly added switch will take the lowest switch number available (2).
1.) 1/0/1 --> so the second will be 2/0/1.
And to address its ports you tape: 2/0/1, 2/0/2, 2/0/3,2/0/4,...2/0/24,...
How to stacked both of the catalyst 3750? just purchase one stackable cable to link both of them and will it automatically configure the 2nd switch from 1/0/1 to 2/0/1 after we plug in the stackable cable into the 2nd switch.
For large deployment I recommand the switches to be provisioned manually: Before stacking the switches:
1/ power on the switch that will be the stack master, then wait till it will be in "Ready" state by issuing "show switch detail" command.
2/ Provision the stack master with the desired stack configuration (numbers of switches, types of switches and interfaces configurations).
3/ Reload the stack master.
4/ Provision the second switch with its number and type.
5/ Power off the second switch afetr having saved its configuration.
6/ Stack the second switch to the stack master.
7/ power it on. It will take the provisioned configuration on the stack master.
The advantage of this procedure is that switches could not be renumbered while stacked and running.
Repeat steps 4 to 7 for each new element having been provisioned in the stack master.
Do not forget to save after each step.
2.) so i put "no mdix auto" on catalyst 3750, what's the meaning and impact?
no mdix-auto will disable the advanced feature of abstructing the type of cable (staight throu or cross over). You will downgrade to the standard interfaces specifications. In fact, mdix-auto (activated by default) permits to not to have the "overhead" of distinguishing crossover and straight throu cables, the interfaces will adapt automatically to the type of cable.
An other advantage of this function is that it opimises (combined with other functions) error and recovery procedures in layers 1 and 2.
Mohamed BEN HASSINE -
Changing Catalyst 3750 Console Speed
Does anyone know if the console speed of a Catalyst 3750 can be changed? The switch does not have a valid IOS image installed and the only prompt accessible is the Switch: recovery console prompt. Before using the xmodem I am hoping there is a way to increase the baud rate to speed things up a bit.
Check out document:
http://www.cisco.com/en/US/products/hw/routers/ps282/products_installation_guide_chapter09186a008007dfca.html
It available witout a login. Look in the section:
"Modifying the Configuration Register in Menu Mode"
Good info to print and keep on hand, cuz when you need it...
HTH.
Jim -
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 -
I have turned on snmp for a catalyst 3750 but my fluke does not seem to be able to find any of my cisco switches. All I did was turn it on and create a read only community. Is there something else I need to configure?
Hi,
Do you know what OIDs the Fluke is polling? Some mibs require the so called Community String Indexing:
http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a00801576ff.shtml
Basically, the read community string (say "public") you configured on the device gives you the
default VLAN 1 info. If you need something (such as BRIDGE-MIB) from VLAN10, you need to change the
community to "public@10" on your Fluke box to poll the Cat3750.
HTH,
Bobby
*Please rate helpful posts. -
VLAN trunking from Cisco Catalyst 3750 to Cisco SF300-48P issue and related
Hello expert,
I'm having difficulties to configure VLAN trunking between Cisco Catalyst 3750 switch with Cisco SF300-48P switch and my workstation unable to get any DHCP IP from our DHCP server via Cisco SF300-48P switch. Below is the snippet of configuration on both switches:
[Cisco Catalyst 3750 Switch]
interface GigabitEthernet1/0/45
description NCC-CC-1stFlr
no switchport trunk encapsulation dot1q
no switchport trunk allowed vlan 101-103
spanning-tree portfast
[Cisco SF300-48P Switch]
interface fastethernet48
spanning-tree link-type point-to-point
switchport trunk allowed vlan add 101-103
macro description switch
!next command is internal.
macro auto smartport dynamic_type switch
interface fastethernet29
switchport mode general
switchport general allowed vlan add 103 tagged
switchport general pvid 103
Are these are correct? Kindly advice!
Thank you very much!
Regards,
AlexHi Alex,
for the trunk port on Catalyst on port GE 1/0/45, we need to enable the trunk and for on encapsulation dot1q because this catalyst model is ISL capable also and the SF300 working only with Dot1q Encapsultion
The configuration on catalyst should :
#config terminal
#interface Gi 1/0/45
# switchport encapsulation
#switchport trunk encapsulation dot1q
#switchport mode trunk
#switchport trunk allowed vlan 101-103
#spanning-tree portfast
For SF300 the port trunk it looks fine but for the port where the PC should receive an IP address
#interface fastethernet29
#switchport mode access
#switchport ccess vlan 103
Please let me know after this configuration
Thanks
Mehdi
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