You're right, we don't, but they're not *completely* unavoidable... :) -C
On Apr 21, 2010, at 10:38 AM, Gert Doering wrote: > Hi, > > On Wed, Apr 21, 2010 at 10:05:29AM -0400, Chris Woodfield wrote: >> However, while researching the issue I found this paragraph in Cisco's docs: >> >> "Note: In MSFC IOS, there is an optimization that will trigger >> VLAN interfaces to repopulate their ARP tables when there is a TCN >> in the respective VLAN. This limits flooding in case of TCNs, as >> there will be an ARP broadcast and the host MAC address will be >> relearned as the hosts reply to ARP." > > "if there is a TCN". > > TCN = Topology Change Notice, so unless a port is causing a spanning-tree > event, there won't be any TCNs -> no rebroadcasting. > > You don't want gratuitous TCNs :-) > > gert > -- > USENET is *not* the non-clickable part of WWW! > //www.muc.de/~gert/ > Gert Doering - Munich, Germany [email protected] > fax: +49-89-35655025 [email protected] _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
