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

[Jon Lewis]

On Mon, 24 Oct 2005, Robert Kiessling wrote:

>> 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.

That sucks...so getting our non-MPLS traffic routed instead of 
tag-switched is actually going to be much more complicated (or at least 
more work) than just tag-switching advertise-tags for <acl> on all the 
PEs.

If I understood you correctly, I'll need an extra lo on each PE (one for 
vpnv4 BGP peering, one for ipv4 peering, twice as many BGP sessions, and 
will have to set things up so that each session is strictly vpnv4 or ipv4, 
but not both (or only accepts routes in the appropriate address-family).

----------------------------------------------------------------------
  Jon Lewis                   |  I route
  Senior Network Engineer     |  therefore you are
  Atlantic Net                | 
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