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List:       cisco-nsp
Subject:    RE: [c-nsp] OC12 layer2 ?
From:       "Michael Smith" <mksmith () noanet ! net>
Date:       2004-10-29 15:50:35
Message-ID: 6B628149FCE1B543A3AB351A29DC7D8E3488F3 () basilisk ! noanet ! lan
[Download RAW message or body]

AFAIK the LANE module doesn't support dot1Q at all, so you have to bring
it up to the Sup Engine as ISL and then convert it to dot1Q.  As I
recall, you can only do that with about 8 VLANs and the performance is
pretty bad.  We were seeing a lot of packet loss under load on the
converted VLANs.

Mike

-----Original Message-----
From: Gert Doering [mailto:gert@greenie.muc.de] 
Sent: Friday, October 29, 2004 1:29 AM
To: Michael Smith
Cc: matthew zeier; cisco-nsp@puck.nether.net
Subject: Re: [c-nsp] OC12 layer2 ?

Hi,

On Thu, Oct 28, 2004 at 08:10:07AM -0700, Michael Smith wrote:
> You could also run an ATM OC-12 to a LANE module on a 5500.  Then, you
> can map PVC's to VLAN's directly using RFC 1483 bridging.  Only caveat
> is the 5500 only supports ISL natively.  If you try to convert to
dot1Q
> on the 5500 things get weird.

Can you elaborate on the last sentence?  

Our 5500 does dot1Q just fine, albeit not on LANE (just WS-X5225R and 
SupIIIG ports) - so I'm a bit surprised whether there any specific to
watch out for when doing dot1Q.

gert
-- 
USENET is *not* the non-clickable part of WWW!
 
//www.muc.de/~gert/
Gert Doering - Munich, Germany
gert@greenie.muc.de
fax: +49-89-35655025
gert@net.informatik.tu-muenchen.de



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