MIBS to Monitor Etherchannel and trunks via SNMP

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Feb 20th, 2009
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I would like to monitor the status of etherchannel and trunk configurations in 6500 Catalyst switches running both CATOS and IOS. I would like to understand the specific mibs/OIDS that should be monitored for etherchannels and trunks. I am trying to get a better handle on tracking the etherchannels and trunk dynamically and then understanding when the ports are having issues (up/down and errors). I need to understand how to differentiate these type of ports from regular access ports.



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rtuttle Fri, 02/20/2009 - 18:30
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at the cli, perform a "show snmp mib ifmib ifindex | inc Port-

This will show you all the mib variables supported as well as the interface values. From here lookup the oid and massage as needed.

Rolf Fischer Thu, 06/06/2013 - 07:03
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Hi Tim,

what exactly do you want to query via SNMP?

For an (PAgP) Etherchannel, the member-interfaces might be interesting:


For a trunk, you could start with the operational mode, depending on the platform you can use:

vlanTrunkPortDynamicStatus (CISCO-VTP-MIB):

vlanTrunkPortDynamicStatus.49 = notTrunking

vlanTrunkPortDynamicStatus.50 = trunking

vlanPortIslOperStatus (CISCO-STACK-MIB):

vlanPortIslOperStatus.13.43 = notTrunking

vlanPortIslOperStatus.13.44 = trunking

Hope that helps


Michel Hegeraat Mon, 06/10/2013 - 03:01
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Keep in mind that the Pos interface (agregate) won't tell you much more then the load.

All interface errors must be found on the physical interface level.

If ever I monitor the Pos it is just to show the used bandwidth in a graph to please my customer, for the rest no aggregate or virtual interfaces are monitored, just the physical interfaces of the trunks are what I consider as interesting.




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