[c-nsp] Break out a VLAN from a QinQ?

[David Freedman]

Skeeve Stevens wrote:
> Hey all,
> 
> Does Cisco have any switches which can:
> 
> a)      Break out a VLAN from within a QinQ trunk
> b)      Renumber VLAN's pulled from such a trunk

> c)      Renumber VLAN's in general

Vlan rewriting has been available for some time now, but alas, there are
many restrictions and these are h/w dependent (i.e one re-write map per
asic, not port)

If you have the cash to spare on 7600 and ES20/ES40/ES+ you can make use
 the "Carrier Ethernet" featureset
(http://www.cisco.com/en/US/docs/ios/cether/configuration/guide/ce_mst_evc_bd_ps6922_TSD_Products_Configuration_Guide_Chapter.html)
to dynamically modify and steer frames as they arrive (think of it as a
kind of route-map , but for ethernet) , this is commonly referred to as
"EVC functionality" (EVC = Ethernet Virtual Circuit)

http://www.cisco.com/en/US/docs/routers/7600/install_config/ES20_config_guide/SRD/baldcsm.html

provides a quick summary of this:

Router(config-if-srv)#rewrite ingress tag {push {dot1q vlan-id | dot1q
vlan-id second-dot1q vlan-id | dot1ad vlan-id dot1q vlan-id} | pop {1 |
2} | translate {1-to-1 {dot1q vlan-id | dot1ad vlan-id}| 2-to-1 dot1q
vlan-id | dot1ad vlan-id}| 1-to-2 {dot1q vlan-id second-dot1q vlan-id |
dot1ad vlan-id dot1q vlan-id} | 2-to-2 {dot1q vlan-id second-dot1q
vlan-id | dot1ad vlan-id dot1q vlan-id}} [symmetric]

Great syntax huh? :)

Dave.

> 
> There seems to me such little info out there on QinQ!
> 
> ...Skeeve
> 
> --
> Skeeve Stevens, CEO/Technical Director
> eintellego Pty Ltd - The Networking Specialists
> skeeve at eintellego.net / www.eintellego.net
> Phone: 1300 753 383, Fax: (+612) 8572 9954
> Cell +61 (0)414 753 383 / skype://skeeve
> --
> NOC, NOC, who's there?
> 
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