[nsp] 3550 not learning MAC addresses?

Temkin, David temkin at sig.com
Sat Feb 7 10:22:44 EST 2004

What is your sdm prefer set to?

"show sdm prefer"

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of John Osmon
Sent: Thursday, February 05, 2004 1:47 PM
To: cisco-nsp at puck.nether.net
Subject: [nsp] 3550 not learning MAC addresses?

I've got a 3550-24-EMI running 12.1.8EA1c that isn't learning MAC
addresses, and thus flooding unicast packets to ports it shouldn't.
Static MAC assignments work fine, and manage to stem the floods, but it
isn't an ideal situation.  (Call me picky, but I like my bridges to
*learn* which stations are where...)

The VLAN in question only has 6 stations, with most of the traffic
passing between two routers at roughly 40Mbps.  One station is a Cisco
2511, and its 10Mbps ethernet port gets overrun without the static MAC

I don't expect many changes on this segment, so static MACs are an OK
workaround, but I really want to find out *why* this is occurring.  I
see no obvious misconfigurations, and googling hasn't turned up much of
use.  Anyone here have any ideas?
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