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

[Skeeve Stevens]

Damn and Awesome ;-)

 

Now I know what the concept is called. but needing a router sucks.

 

.Skeeve

 

From: Joe Freeman [mailto:joe at netbyjoe.com] 
Sent: Tuesday, 26 June 2007 2:53 AM
To: skeeve at skeeve.org
Cc: Cisco-nsp
Subject: Re: [c-nsp] Possible Stupid Questions Alert - Combining VLAN's

 

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_guid
e09186a008016102a.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  <mailto: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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