[j-nsp] Ethernet CCC with dot1.q tags

sthaug at nethelp.no sthaug at nethelp.no
Thu Nov 30 12:42:48 EST 2006

> I have an ethernet CCC connection with customer L2 switches on either side
> configured. I was doing an unrelated configuration on the switches when I
> notice a number of VLANs being carried over the CCC. Since the CE-facing and
> the CCC instance are configured with ethernet-ccc encap, as I understand it,
> it will not recognize the dot1.q tags and proceed to drop the frames. Is
> this an undocumented feature of the CCC whereby a number of VLANs can be
> carried across an ethernet CCC provided that the CE-facing interface is
> configured with an oversized MTU?

ethernet-ccc is for a "port mode" Martini tunnel which will basically
carry *anything* that arrives at the router interface, whether it is
802.1q tagged or something else.

If you want the *router* to enforce the VLAN tag(s) carried in the
Martini tunnel you need to configure a 802.1q subinterface with the
desired vlan-id, and use vlan-ccc encapsulation on the subinterface.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no

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