[c-nsp] ASR920 Service Instance - when to 'rewrite ingress'

[Eric Van Tol]

> > interface GigabitEthernet0/0/6
> > mtu 9216
> > no ip address
> > load-interval 30
> > negotiation auto !
> > service instance 243 ethernet
> > description SI243
> >  encapsulation dot1q 243
> >  bridge-domain 243
> 
> Here you need indeed to pop 1 tag, otherwise on the backplane you will
> have 2 times the 243 tag. The "encapsulation dot1q" config in an
> EVC doesn't (ever) pop the tag, and a "bridge-domain" config does
> always assign the frame to a bridge-domain (implying that it pushes
> a tag).

Why would it add a second tag?  It's my understanding that the 'encapsulation dot1q' command is simply mapping a VLAN (or VLANs, or none) to a particular SI.  Are you saying because 'bridge-domain' is configured is why the second tag is being added?  

-evt