[nsp] dot1q subints on 6500/sup720

[Brant Stevens]

<quote> Are there any gotchas to watch out for the the internal vlans? We'll
be using this box as almost exclusively L3.

Simon
</quote>

Using it as an L3 box shouldn't be much of a concern, but, the internal vlan
allocation, by default starts assigning vlan numbers in ascending order,
somewhere in the 1000 range (please correct me if I am wrong).  If you have
vlans that are in the low 1000s (like 1030, for example) then you run the
risk of the internal and manuall assignments clashing.  Cisco suggests using
the descending allocation policy to get around this...  (VLANs start at
4095)

-Brant
-----Original Message-----
From: Simon Lockhart [mailto:simon.lockhart at bbc.co.uk] 
Sent: Tuesday, March 30, 2004 2:43 PM
To: Jared Mauch
Cc: cisco-nsp at puck.nether.net; Tomas Daniska
Subject: Re: [nsp] dot1q subints on 6500/sup720

On Tue Mar 30, 2004 at 02:20:35PM -0500, Jared Mauch wrote:
> 	you can't do subints on the 6k, they don't do what they do on other 
> platforms (gsr, 7500, 7200).

...but you can with the GE-WAN blade? I presume I can create dot1q subints
on a ge-wan interface, and the vlan ids aren't seen in the L2 space on the
6500 at all? We're trying to avoid buying any of the OSM blades, because of
cost, at the moment, but may need to plan for them in the future if it's the
only way to do dot1q subints ona 6k like we can on the 7200/gsr.
 
> 	I thought cisco removed the ability to configure subints on the 6k 
> due to this.  You want to use that as a l2 switch port and then 
> terminate things on the "interface vlan4090" interface within the 6k.

Yes. 

> 	you should also check your (internal) vlan mappings that are
assigned 
> by your l3 ports on the 6k/7600 by "sh vlan internal mapping" command.

Are there any gotchas to watch out for the the internal vlans? We'll be
using this box as almost exclusively L3.

Simon
-- 
Simon Lockhart     |   Tel: +44 (0)1628 407720 (x(01)37720) | Si fractum 
Technology Manager |   Fax: +44 (0)1628 407701 (x(01)37701) | non sit, noli 
BBC Internet Ops   | Email: Simon.Lockhart at bbc.co.uk        | id reficere
BBC Technology, Maiden House, Vanwall Road, Maidenhead. SL6 4UB. UK

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