[c-nsp] single to double tag translation

[Marlon Duksa]

Hi - we have cisco 7609 and need to map single tags into dual tags like
this:
tag 100 in  ---->  100:100 out
tag 101 in ----->  100:101 out
tag 102 in ----->   100:102 out

tag 200 in  ---->  200:200 out
tag 201 in ----->  200:201 out
tag 202 in ----->   200:202 out

So in essence we need to prepend a tag to the original tag according to the
above mapping.

Traffic is coming in on a single interface and going out on a single
interface.
This is on CEF720 48 port 10/100/1000mb Ethernet  WS-X6748-GE-TX  card.
Sw version is 12.2(33)SRC

Is there any way to do this? Please note that we can't use EVC context in
this mode as we have this older card.

Thanks,
Marlon