catalyst 4006 configuration portchannel

Answered Question
May 30th, 2008
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Hello,


we have 2 C4006 connected with fiber channel in a portchannel configuration, sometimes on of the two catalyst in the logg i have the following messages, can you tell me how to troubleshoot it, the problem is that we loose client server connections during one or two seconds :


May 30 09:52:18: %EC-5-UNBUNDLE: Interface GigabitEthernet1/2 left the port-channel Port-channel5

May 30 09:52:23: %EC-5-BUNDLE: Interface GigabitEthernet1/2 joined port-channel Port-channel5

May 30 09:52:25: %STANDBY-6-STATECHANGE: Vlan32 Group 132 state Standby -> Active

May 30 09:52:25: %STANDBY-6-STATECHANGE: Vlan2 Group 102 state Standby -> Active

May 30 09:52:26: %STANDBY-6-STATECHANGE: Vlan39 Group 139 state Standby -> Active

May 30 09:52:26: %STANDBY-6-STATECHANGE: Vlan11 Group 111 state Standby -> Active

May 30 09:52:28: %STANDBY-6-STATECHANGE: Vlan13 Group 113 state Standby -> Active

May 30 09:52:54: %STANDBY-6-STATECHANGE: Vlan2 Group 102 state Active -> Speak

May 30 09:52:54: %STANDBY-6-STATECHANGE: Vlan39 Group 139 state Active -> Speak

May 30 09:52:54: %STANDBY-6-STATECHANGE: Vlan32 Group 132 state Active -> Speak

May 30 09:52:54: %STANDBY-6-STATECHANGE: Vlan13 Group 113 state Active -> Speak

May 30 09:52:54: %STANDBY-6-STATECHANGE: Vlan11 Group 111 state Active -> Speak


thank you for your help, i can send to you port configuration if you need it

Correct Answer by n.nandrekar about 9 years 2 months ago

It is difficult to guess the problem.

The link seems to go flap but how do we know if it is due to any physical problem or in s/w? If possibel check the link for physical connectivity ( if incase the cable is lose.)

Second thing is that.. do you have redundant link other than the portchannel? What is the stp state there. Can you look at it from loop perspective?

- nirnajan

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n.nandrekar Fri, 05/30/2008 - 00:54
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Hi!

Can you check if there is a flap in the physical link gi1/2?


regards,

Niranjan

yann.boulet Fri, 05/30/2008 - 01:01
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How can i check it ? because it's real that sometimes i Have in the log, PORT X/X flap between ...

Does it mean that i have a MAC overlap ?


Can you tell me what to do ?


regards

yann.boulet Fri, 05/30/2008 - 01:13
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it's good for you we have just been disconnected and in the logs i have this right now :


May 30 10:47:07: %CLEAR-5-COUNTERS: Clear counter on interface GigabitEthernet4/5 by vty0 (10.13.1.102)

May 30 11:04:57: %STANDBY-6-STATECHANGE: Vlan516 Group 116 state Standby -> Active

May 30 11:04:59: %STANDBY-6-STATECHANGE: Vlan142 Group 142 state Standby -> Active

May 30 11:05:17: %C4K_EBM-4-HOSTFLAPPING: Host 00:03:47:E4:17:F0 in vlan 204 is flapping between port Po5 and port Gi3/2

May 30 11:05:17: %C4K_EBM-4-HOSTFLAPPING: Host 00:16:35:5C:A6:CE in vlan 204 is flapping between port Gi2/3 and port Gi5/29

May 30 11:05:17: %C4K_EBM-4-HOSTFLAPPING: Host 00:17:08:50:86:8D in vlan 204 is flapping between port Gi2/3 and port Po5

May 30 11:05:18: %C4K_EBM-4-HOSTFLAPPING: Host 00:17:08:50:86:8D in vlan 204 is flapping between port Po5 and port Gi2/3

May 30 11:05:18: %C4K_EBM-4-HOSTFLAPPING: Host 00:03:47:E4:17:F0 in vlan 204 is flapping between port Gi3/2 and port Po5

May 30 11:05:18: %C4K_EBM-4-HOSTFLAPPING: Host 00:1B:78:77:20:CC in vlan 204 is flapping between port Gi2/3 and port Po5

May 30 11:05:18: %C4K_EBM-4-HOSTFLAPPING: Host 00:16:35:5C:A6:CE in vlan 204 is flapping between port Gi2/3 and port Gi5/29

May 30 11:05:19: %C4K_EBM-4-HOSTFLAPPING: Host 00:03:47:E4:17:F0 in vlan 204 is flapping between port Gi3/2 and port Po5

May 30 11:05:20: %C4K_EBM-4-HOSTFLAPPING: Host 00:16:35:5C:A6:CE in vlan 204 is flapping between port Gi2/3 and port Gi5/29

May 30 11:05:20: %C4K_EBM-4-HOSTFLAPPING: Host 00:1B:78:77:90:8A in vlan 204 is flapping between port Gi5/12 and port Gi2/3

May 30 11:05:23: %C4K_EBM-4-HOSTFLAPPING: Host 00:18:FE:FB:8D:F1 in vlan 204 is flapping between port Po5 and port Gi2/3

May 30 11:05:24: %C4K_EBM-4-HOSTFLAPPING: Host 00:1A:4B:CE:01:1A in vlan 204 is flapping between port Gi2/3 and port Gi5/22

May 30 11:05:24: %C4K_EBM-4-HOSTFLAPPING: Host 00:1B:78:77:20:CC in vlan 204 is flapping between port Gi2/3 and port Po5

May 30 11:05:30: %STANDBY-6-STATECHANGE: Vlan142 Group 142 state Active -> Speak

May 30 11:05:30: %C4K_EBM-4-HOSTFLAPPING: Host 00:1B:78:CB:A3:96 in vlan 204 is flapping between port Gi2/3 and port Gi5/33

May 30 11:05:32: %C4K_EBM-4-HOSTFLAPPING: Host 00:17:08:50:86:8D in vlan 204 is flapping between port Gi2/4 and port Po5

May 30 11:05:33: %STANDBY-6-STATECHANGE: Vlan516 Group 116 state Active -> Speak

May 30 11:05:34: %C4K_EBM-4-HOSTFLAPPING: Host 00:03:47:E4:17:F0 in vlan 204 is flapping between port Gi3/2 and port Po5

May 30 11:05:34: %C4K_EBM-4-HOSTFLAPPING: Host 00:16:35:5C:A6:CE in vlan 204 is flapping between port Gi2/3 and port Gi5/29

May 30 11:05:35: %C4K_EBM-4-HOSTFLAPPING: Host 00:1B:78:77:90:8A in vlan 204 is flapping between port Gi5/12 and port Gi2/3

May 30 11:05:46: %STANDBY-6-STATECHANGE: Vlan142 Group 142 state Standby -> Active

May 30 11:05:49: %STANDBY-6-STATECHANGE: Vlan142 Group 142 state Active -> Speak

May 30 11:06:09: %STANDBY-6-STATECHANGE: Vlan142 Group 142 state Standby -> Active

May 30 11:06:20: %STANDBY-6-STATECHANGE: Vlan142 Group 142 state Active -> Speak


does it speak to you ?

Correct Answer
n.nandrekar Fri, 05/30/2008 - 01:43
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It is difficult to guess the problem.

The link seems to go flap but how do we know if it is due to any physical problem or in s/w? If possibel check the link for physical connectivity ( if incase the cable is lose.)

Second thing is that.. do you have redundant link other than the portchannel? What is the stp state there. Can you look at it from loop perspective?

- nirnajan

yann.boulet Sun, 06/01/2008 - 21:20
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Hi,


To elimitate some physical issues, i replace GBIC which was not cisco one, in the configuration we have two ports G1/1 and G1/2 on each Catalyst configured in the portchannel, that's all according to me. STP is configured as default for the switches in the floors and we have SPANNING-TREE PORTFAST for all the ports meaning the servers connected, is it good to do that ?


Thank you



Edison Ortiz Mon, 06/02/2008 - 16:27
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STP is configured as default for the switches in the floors and we have SPANNING-TREE PORTFAST for all the ports meaning the servers connected, is it good to do that ?


Yes, Spanning-Tree portfast accelerates the opening of the port and it's best practice to have it enabled when the switchports are servicing end-hosts such as servers and workstations.


HTH,


__


Edison.

yann.boulet Mon, 06/02/2008 - 21:03
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Thank you for the all, the replacement of the GBIC by cisco one and the clear mac entries seems to resolve the problem for the moment.


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