[c-nsp] Re-thinking (remembering) how a switch operates

[Tim Bulger]

This does also depend on your layer 2 architecture, though.  ARP replies are
not broadcasts, so it is possible for the replies to not be seen by some
switches in a VLAN, resulting in traffic for that MAC being forwarded to all
ports.  Typically this occurs when the layer 3 send and return paths for
that IP address are through different routers.

-Tim

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of David J. Hughes
Sent: Wednesday, April 27, 2005 10:04 PM
To: Lincoln Dale
Cc: 'cisco-nsp'
Subject: Re: [c-nsp] Re-thinking (remembering) how a switch operates


> i'm wondering if its a bad cable such that you actually have a 
> unidirectional link that can receive but not transmit...

Nahh, just a side effect of people running longer arp caches than cam table
timers.  We reconfigure the mac timeout to match the arp timeout to ensure
this doesn't happen.


David
...

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