[c-nsp] What causes mac table relearning?

[Randy]

Hi Mike,

L2 re-learn can happen for a lot of different reasons.
Can you please share your topology where you are seeing this behavior.
-Randy




________________________________
From: Aaron1 <aaron1 at gvtc.com>
To: Mike <mike-cisconsplist at tiedyenetworks.com> 
Cc: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
Sent: Wednesday, October 17, 2018 3:28 PM
Subject: Re: [c-nsp] What causes mac table relearning?



You say you weren’t running spanning tree, but I thought topology change notification bridge PDUs caused a Mac flush, I don’t know For sure

Aaron

> On Oct 17, 2018, at 4:32 PM, Mike <mike-cisconsplist at tiedyenetworks.com> wrote:
> 
> Hi,
> 
> 
>     I have a network consisting of 3560g switches and I do not run spanning tree in this network. I have noticed a symptom when a vlan trunk interface goes down/up,  all mac addresses in the vlans carried by that trunk also seem to be cleared at the same time. Im not just talking the mac addresses on the port itself; rather, across the other switches themselves , even for mac addresses that have no connection to the port itself they just happen to be in one of the vlans. If I have missed something fundamental I'd love to know but I am not aware of any lan switching rules that would require this behavior.
> 
> 
> Mike-
> 
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