[c-nsp] OC12 layer2 ?

[Michael Smith]

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 at greenie.muc.de] 
Sent: Friday, October 29, 2004 1:29 AM
To: Michael Smith
Cc: matthew zeier; cisco-nsp at 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
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