[c-nsp] Strange static MAC address entry is cisco 6500, anyone seen this?

Jay Ford jay-ford at uiowa.edu
Thu Jan 15 17:16:28 EST 2015

On Thu, 15 Jan 2015, Maarten Carels wrote:
> Investigation learned however that both the 6500 had static entries in their MAC address tables for
> 3333.0001.0002

That's most likely the result of MLD snooping.  In this case "static" means 
not "dynamic" (normal traffic-based MAC learning);  the switch put the MAC 
entry there as part of the MLD snooping mechanism.

In my experience, MLD snooping is broken in various older hardware & in some 
software.  You could try disabling it instead of overriding it with your own 
static MAC entry.

Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford at uiowa.edu, phone: 319-335-5555

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