[c-nsp] tag-switching advertise-tags for?

[Robert Kiessling]

Jon Lewis wrote:
> My understanding was that MPLS-VPN traffic has to be label-switched.

Thus the "LS" in "MPLS".

> tables or policy routing.  Do all the PE router lo0's have to be 
> advertised into TDP/LDP for MPLS-VPN tag switching to work?

All your loopbacks that are nexthops for BGP in the vpnv4 address
family have to be advertised by LDP, and only those have to.

> How/why would traffic to bgp learned non vpnv4 prefixes be label-switched 
> if tags for those prefixes were not advertised?

If the next hop is label switched, then the prefix itself
is too.

Robert