The MPLS WG Archive

[neil.2.harrison@bt.com]

Vijay,

You wrote Vijay Bollapragada 31 May 2002 19:34
> 
> On Fri, 31 May 2002, Shahram Davari wrote:
> 
> > Vijay,
> 
> > But LDP does not give you the TE ability. So why use LDP?
> 
> Agreed, that LDP does not give the ability to do TE, I only 
> said use MPLS
> in the core, not necassarily LDP :-) but in any case, Here is 
> what 2547
> draft says about using LDP for the top label..
> 
> Section 4.3.2
> 
> "All that matters for the VPN architecture is that some label switched
> path between the router and its BGP next hop exists.  
> However, to ensure
> interoperability  among systems which implement this VPN architecture,
> all such systems must support LDP [MPLS-LDP]."
> 
> Of course, once could use many other mechanisms to get the vpn_labeled
> packet from one edge PE to another edge PE, Interoperability 
> is the key
> here.
NH=> So are you saying the only reason for LDP is because there is a need to
run VPN services composed of (i) multiple vendors and (ii) multiple SPs
across a population of P routers?  Can you (or anyone else) identify some of
these cases please?

regards, Neil