Unicast Flooding

Steven King sking at kingrst.com
Thu Jun 18 18:45:45 UTC 2009

Relying on a TCN would yield very inconsistent results.

Lee wrote:
> On 6/18/09, Brian Shope <blackwolf99999 at gmail.com> wrote:
>> Thanks for all the good info..
>> So it sounds like changing my CAM timeout to 4 hours is the best
>> suggestion.  Anyone have any problems when implementing this?
> Not as long as all the user ports have portfast enabled.  Without
> portfast, when a port goes up or down it causes a topology change
> notification which sets the fast aging timer and the cam table entries
> age out in something like 15 seconds.
> Regards,
> Lee

Steve King

Network Engineer - Liquid Web, Inc.
Cisco Certified Network Associate
CompTIA Linux+ Certified Professional
CompTIA A+ Certified Professional

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