[c-nsp] Possible Stupid Questions Alert - Combining VLAN's

[Joe Freeman]

You're looking for 802.1q tag rewrite. That said, it appears Cisco only does
it in routers or on EoMPLS.

http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a008016102a.html#wp1279134

I checked the feature navigator as well, and as a feature, it's only in a
couple of variants of 12.4, and then only on a few platforms (3845, 7200).

Joe

On 6/25/07, Skeeve Stevens <skeeve at skeeve.org> wrote:
>
>
> As I said - Possible Stupid Question Alert ;-)
>
> What I want to do I think is valid, so please keep flames on low!
>
> I want to literally be able to change a VLAN's number in a path of
> switches.
>
> For example: in a peering point we have half a dozen ISP's sharing a
> central
> switch for some private peering.
>
> All connections are Trunks so the different ISP's can patch dot1q VLAN's
> to
> each other in whatever way they like.
>
> The issue is with conflicting VLAN numbers in the switch chain (involving
> 3750G, 3550, 3560G, 3524XL) and the trunks to the ISP's themselves.
>
> So, when there is a conflict, I'd essentially like to 'renumber' the VLAN
> and then pass it off up the chain so their isn't a conflict in the path.
>
> Ideally.
>
> ISP - uses 100
> Sends up trunk into shared switch
> Switch turns vlan 100 into vlan 650 and then sends out link to upstream
> switch and it is forever 650.
>
> Or something like that.
>
> I realise I could just burn 2 ports and put a x-over cable between them,
> but
> it seems such a waste.
>
> It would also be done on a router, but we don't have that kit available.
>
> I'm ready for useful comments and a share of ridicule.
>
> For those with a massive amount of money who can buy anything their like
> and
> may respond 'just by a 6509', please remember that not all of us have
> massive amounts of unlimited funding to $100k on a 10G interface for a GSR
> when 100k might be out yearly budget! ;-)
>
> .Skeeve
>
>
>
> --
> Skeeve Stevens, RHCE
> skeeve at skeeve.org / www.skeeve.org
> Cell +61 (0)414 753 383 / skype://skeeve
>
> eintellego - skeeve at eintellego.net - www.eintellego.net
> --
> I'm a groove licked love child king of the verse
> Si vis pacem, para bellum
>
>
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