From: Chuck Church (cchurch@MAGNACOM.com)
Date: Tue Sep 03 2002 - 17:08:02 GMT-3
Cade,
I never got a definitive answer why, but occasionally I've seen a
mac address flap between it's correct SPAN source port and the incorrect
SPAN destination port. When this happened, the device on the source
(monitoring) port became unreachable to other devices on the network, as you
would assume. The switch logs and console showed the flaps as they
occurred. Giving that device on the source port a static CAM entry fixed
it. I believe on the SPAN line I disabled dynamic learning of MACs as well.
Never had the problem again. HTH.
Chuck Church
CCIE #8776, MCNE, MCSE
Sr. Network Engineer
Magnacom Technologies
140 N. Rt. 303
Valley Cottage, NY 10989
845-267-4000
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
ted.mcdermott@exeloncorp.com
Sent: Tuesday, September 03, 2002 2:20 PM
To: cwagner@logosinc.com; ccielab@groupstudy.com
Subject: RE: set cam / span
Cade,
The only thing that I can think of is that using CAM you might be
able to lock down traffic such that it doesn't impact anything except the
source and destination stations. It would be a good solution to a layer-two
only switch where a lot of traffic came in the source port, and you wanted
to avoid it from impacting the other stations on the switch. Perhaps, a
heavy-duty multicast or broadcast could be contained that way. Anyone know
how to do this?
Ted
-----Original Message-----
From: Cade Wagner [mailto:cwagner@logosinc.com]
Sent: Tuesday, September 03, 2002 1:20 PM
To: 'ccielab@groupstudy.com'
Subject: FW: set cam / span
The question of using CAM and SPAN together was posed some time ago,
and I don't think that there was a good answer at the time. Does anyone
have a good answer now? Just can't seem to understand why you should
statically set CAM Macs when using SPAN as some have recommended. Thanks in
advance.
Cade
-----Original Message-----
From: avantus1@hotmail.com [mailto:avantus1@hotmail.com]
Sent: Wednesday, January 23, 2002 10:02 PM
To: ccielab@groupstudy.com
Subject: set cam / span
Hi, all
Could anyone explain the reason why I should set cam permanent when
configuring span?
any help would be appreciated.
thanks in advance
BS Kang.
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