[c-nsp] Unicast traffic being sent to every port? Aging issue?

[Chris Woodfield]

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
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> Gert Doering - Munich, Germany                             gert at greenie.muc.de
> fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de