[j-nsp] vpls loop avoidance

[Keegan Holley]

A spanning tree TCN would do it as well.  It would be nice if configuring
STP at the edge caused the box to TCN when it gives up mastership.  I
haven't tried it but I'm pretty sure it doesn't.

2011/10/20 David Ball <davidtball at gmail.com>

> On 20 October 2011 14:00, William Cooper <wcooper02 at gmail.com> wrote:
> > I might be confused... but wouldn't the switches learn the MAC to port
> > association dynamically based
> > on traffic flows?
>
>  In the absence of gratuitous ARP (used, for example, by VRRP), no.
> The switch will learn it once, cache it, and that MAC-to-port entry
> will remain until it times out and is relearned (unless the switch
> port goes down, in which case the switch will flush MACs learned on
> that port).  This is where an earlier poster's idea of shortening the
> MAC aging timeout on the switch could help a little, though some folks
> might prefer faster failover than is afforded by MAC timeouts on a
> dead (yet still admin/oper UP) port.  You can typically flush the MAC
> table manually on the switch, but that's certainly not a viable
> solution for speeding up automated failover.
>
> David
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