From: Volkov, Dmitry (Toronto - BCE) (dmitry_volkov@ca.ml.com)
Date: Tue Sep 03 2002 - 17:31:25 GMT-3
Chuck
I'm sorry.
Do You suggest to put static CAM on the source port or on both - span source
and span destination ?
Dmitry
> -----Original Message-----
> From: Chuck Church [mailto:cchurch@MAGNACOM.com]
> Sent: Tuesday, September 03, 2002 4:08 PM
> To: 'ted.mcdermott@exeloncorp.com'; 'cwagner@logosinc.com';
> 'ccielab@groupstudy.com'
> Subject: RE: set cam / span
>
>
> 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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