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

Maarten Carels lists at carels.info
Fri Jan 16 04:34:06 EST 2015

> On 15 Jan 2015, at 23:16 , Jay Ford <jay-ford at uiowa.edu> wrote:
> 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.
Static entries were my 'workaround'. You directed me to the real cause!
Disabling mld by setting:
no ipv6 mld snooping
removed that idiotic entry

Many thanks, you saved my day!


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