MAC address table aging

Unanswered Question
mheusinger Wed, 02/07/2007 - 05:44


there is one scenario, I remember, which might require adjustment of those timers:

"Asymmetric Routing and HSRP (Excessive Flooding of Unicast Traffic in Network with Routers That Run HSRP)"

and also "Unicast Flooding in Switched Campus Networks"

Basically it might happen that the MAC address table entry times out (5 min) whereas an ARP table entry is still present in a host/router (4 h aging ARP time) leading to unwanted unicast flooding. One countermeasure is to configure both timer to be the same.

Regards, Martin


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