Need help on " Interface Showing Inactive on cat4500".

[gkchakravarthy]

We have 3 Cat 4500 switches on three floors teh 3rd floor switch connects to the 2nd and 4th floor switches ,but we are receiving an alert from monitoring tool that " Interface(314) Backup-1Gb-Ring is Down at least 2 min on Switch: SOM500-4510-3FL 
the following output from "sh int status module 1 " shows the int 1/3 and 1/4 are 'inactive'local IT guy said If the status is inactive,the ports cannot be used and might lost the capability when he added 48-port blade into the 10th slot.Can someone help try to identify the issue here.

2nd Floor

Port      Name               Status       Vlan       Duplex  Speed Type
Te1/1     SOM500-Core1       connected    trunk        full    10G 10GBase-LRM
Te1/2     SOM500-Core1       connected    trunk        full    10G 10GBase-LRM
Gi1/3     Backup-1Gb-Ring    notconnect   1            full   1000 1000BaseSX
Gi1/4     Backup-1Gb-Ring    connected    trunk        full   1000 1000BaseSX

3rd Floor
Port      Name               Status       Vlan       Duplex  Speed Type
Te1/1     SOM500-Core1       connected    trunk        full    10G 10GBase-LRM
Te1/2     SOM500-Core1       connected    trunk        full    10G 10GBase-LRM
Gi1/3     Backup-1Gb-Ring    inactive     1            full   1000 1000BaseSX
Gi1/4     Backup-1Gb-Ring    inactive     1            full   1000 1000BaseSX
Gi1/5                        inactive     1            full   1000 No Gbic
Gi1/6                        inactive     1            full   1000 No Gbic

4th Floor
Port      Name               Status       Vlan       Duplex  Speed Type
Te1/1     SOM500-Core1       connected    trunk        full    10G 10GBase-LRM
Te1/2     SOM500-Core1       connected    trunk        full    10G 10GBase-LRM
Gi1/3     Backup-1Gb-Ring    inactive     1            full   1000 1000BaseSX
Gi1/4     Backup-1Gb-Ring    inactive     1            full   1000 1000BaseSX

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASEK9-M), Version 12.2(31)SGA10, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2009 by Cisco Systems, Inc.
Compiled Fri 12-Jun-09 15:33 by karnagar
Image text-base: 0x10000000, data-base: 0x115D7330

ROM: 12.2(31r)SGA3
Pod Revision 16, Force Revision 34, Tie Revision 32

SOM500-4510-4FL uptime is 1 year, 38 weeks, 1 day, 10 hours, 26 minutes
Uptime for this control processor is 1 year, 38 weeks, 1 day, 9 hours, 37 minutes
System returned to ROM by power-on
System restarted at 23:29:54 EDT Sun May 1 2011
System image file is "slot0:cat4500-ipbasek9-mz.122-31.SGA10.bin"

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cisco WS-C4510R (MPC8540) processor (revision 11) with 524288K bytes of memory.
Processor board ID FOX091404HA
MPC8540 CPU at 800Mhz, Supervisor V-10GE
Last reset from PowerUp
2 Virtual Ethernet interfaces
340 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
511K bytes of non-volatile configuration memory.

Configuration register is 0x2102

[cmarva]

would you be able to post the port configs of g1/3 and g1/4?

the only time I've ever seen inactive is when a port was set to a vlan that didn't exist

on the switch, but vlan 1 can't be removed, so.....

chris

[gkchakravarthy]

Hi Chris,

find the detais below

interface GigabitEthernet1/3
description Backup-1Gb-Ring
switchport trunk encapsulation dot1q
switchport trunk native vlan 500
switchport mode trunk
ip arp inspection trust
ip dhcp snooping trust
end

interface GigabitEthernet1/4
description Backup-1Gb-Ring
switchport trunk encapsulation dot1q
switchport trunk native vlan 500
switchport mode trunk
ip arp inspection trust
ip dhcp snooping trust
end

[cmarva]

ok, thanks.

doesn't look like anything is out of the ordinary. So getting back to my last post, does vlan 500 exist on the switch?

Also do a sho int trunk. I don't see any vlan allowed/removed statements so I assume the default of 1-4094 allowed on

the trunk. If a sho int trunk shows no vlans allowed on the trunk, then I think that's your problem.

also, getting back to my last post, disregard about the vlan 1 statement. My error.

chris

[gkchakravarthy]

Chris

Thanks for your reply

include out from sh int tru

SOM500-4510-2FL#sh int trunk module 1

Port        Mode             Encapsulation  Status        Native vlan
Te1/1       on               802.1q         trunk-inbndl  500
                                      (Po2)
Te1/2       on               802.1q         trunk-inbndl  500
                                      (Po2)
Gi1/3       on               802.1q         other         500
Gi1/4       on               802.1q         trunking      500
Gi1/5       auto             negotiate      other         1
Gi1/6       on               802.1q         trunking      500

Port        Vlans allowed on trunk
Te1/1       1-4094
Te1/2       1-4094
Gi1/3       none
Gi1/4       1-4094
Gi1/5       none
Gi1/6       1-4094

Port        Vlans allowed and active in management domain
Te1/1       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500
Te1/2       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500
Gi1/3       none
Gi1/4       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500
Gi1/5       none
Gi1/6       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500

Port        Vlans in spanning tree forwarding state and not pruned
Te1/1       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500
Te1/2       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500

Port        Vlans in spanning tree forwarding state and not pruned
Gi1/3       none
Gi1/4       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500
Gi1/5       none
Gi1/6       1,4,10-11,15,20-22,25-27,30-35,40-41,45,57-58,60-62,64-70,72-77,100-102,111-114,128,161,180,182,184,200-202,212,254-255,301-302,401-402,500

[cmarva]

Gopineni,

ok, thanks. What I am not sure of is whether or not it shows no vlans allowed on trunk because it is inactive,

or if it is inactive because there are no vlans allowed on the trunk, I believe it is inactive because no vlans are allowed

on the trunk.

Are these links in use or connected to anything? If not, I would reset them to default config and shut them down

(default interface g1/3, default interface g1/5).

If they should be in use, and that's what you are troubleshooting, then

just adding vlans allowed should bring it back into service. Going by the descriptions, this might not be a good test

scenario, but you can always add a vlan that is not on the other trunks. For instance, add vlan 80 as an allowed vlan and

see if it comes out of inactive state.

[gkchakravarthy]

Ok Chris will test and post the results.

Thank You.