[c-nsp] Problems sub-interface Catalyst 6500

[Ian Cox]

At 04:29 PM 5/7/2006 -0700, Tim Stevenson wrote:
>I'm not sure such an approach has been considered, but the relative
>complexity and potential caveats/limitations would potentially be
>high versus actual utility.
>
>Tim

We looked at this at one stage for the WS-X... modules but the caveat 
list is complex, since it relies on using the Port ASIC remapping 
table -> VLAN translation. The table is shared across the ports on a 
port ASIC, not per port. If port 1 wants to map 200 to 300, then port 
2 on the same port asic can not also remap inbound port 200. You 
would have to move that port to another port ASIC to be able to do 
it. Then everything remapped on port 1, also applies for traffic 
inbound on port 2, if you need to do remapping of vlans on port 1 and 2.

VLAN translation:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_configuration_guide_chapter09186a0080160a7c.html#wp1044990


Ian

>At 01:49 PM 5/7/2006, Asbjorn Hojmark - Lists remarked:
> >I would have thought it could be implemented using an internal
> >VLAN translation (translating the interface-significant number
> >to an internal VLAN), but I guess there's something preventing
> >that. (Maybe just the fact that not all interfaces can do VLAN
> >translation). Maybe Tim can comment.
>
>
>
>Tim Stevenson, tstevens at cisco.com
>Routing & Switching CCIE #5561
>Technical Marketing Engineer, Catalyst 6500
>Cisco Systems, http://www.cisco.com
>IP Phone: 408-526-6759
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