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vinay.trivedi
Beginner

Port channel disruption due to one E port down

Hi

We have one port channel configured in our Customer environment. This port channel has been configured with 6x4Gbps ports inside it. One of the switch port started flapping (up & down) continuously, which caused multiple alerts on many hosts as well as drastic performance slowness on one of the Business Critical application. It caused a major issue and later on after disabling this port administratively, the issue got resolved.

Could you let me know the cause of major impact and port-channel behavior in such rare cases, where because of one port flapping, whole port channel got affacted ? Is it a expected behavor of port-channel of kind of software bug in Cisco MDS 9513 switches running SAN OS ?

2 REPLIES 2
chris.walden
Beginner

Can you share the version of SanOS you are running, as well as the configuration of the port-channel?

Hi Chris,

Thanks for the response.

The switch is running with OS version 4.2(7e) and the port-channel  configuration is provided below:

port-channel 31 is trunking   

Admin  port mode is E, trunk mode is on   

snmp link state traps are enabled   

Port mode is TE   

Port vsan is 1   

Speed is 24 Gbps   

Trunk vsans  (admin allowed and active) (1,5,431,435)   

Trunk vsans  (up)                       (1,5,431,435)   

Trunk vsans  (isolated)                 ()   

Member[2] : fc1/2   

Member[3] :  fc1/3   

Member[4] : fc1/4   

Member[5] : fc1/5   

Member[6] : fc1/6

Please let me know in case any further details required.

Regds,

Vinay

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