If there is a way to terminate it directly, let me know, because I'm pretty sure we still have a cable looping back into the same 6807 to terminate an inner tag... yikes.
-- Hunter Fuller Router Jockey VBH Annex B-5 +1 256 824 5331 Office of Information Technology The University of Alabama in Huntsville Network Engineering On Tue, Feb 19, 2019 at 10:02 AM James Bensley <[email protected]> wrote: > > On Mon, 18 Feb 2019 at 18:14, <[email protected]> wrote: > > > > > Cat6K and 6880 support QinQ. > > > We use it to connect some L3 vlans between our DC. > > > I’m not at my desk, but from memory, .. > > > 1) on the access port facing the ‘client’ …. > > > Switchport mode dot1q-tunnel > > > switchport access vlan xxx. Where xxx is the transport/service > > > provider side vlan assigned to this client. > > > 2) add the above ‘xxx’ transport vlan to any dot1q trunks used between > > > client sites. > > > > Note well the difference between > > > > - QinQ: An extra (outer) VLAN tag is added to ingress Ethernet frames > > which already contain one or more VLAN tags. Example configuration is > > "switchport mode dot1q-tunnel" + "switchport access vlan X". > > > > - Double VLAN tag termination: An Ethernet service (e.g. IP based) is > > terminated on the Catalyst switch based on both outer (SVLAN) and inner > > (CVLAN) tags. Example config is "encapsulation dot1Q X second-dot1q Y". > > > > As far as I know, Cat 6500 supports the former but not the latter. I > > have no experience with the 6880. > > ^ This. 6500s can't terminate double tagged frames at layer 3. They > can perform dot1q "tunnelling" only. I looked at 6880 a few years ago, > I'm pretty sure this was one of the reasons we doing for it it, too > similar to the 6500 (including this limitation). > > Cheers, > James. > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
