MPLS Help

steve-o87

This caught my eye in the Wiki page for MPLS;

"MPLS relies on IGP routing protocols to construct its label forwarding
table, and the scope of any IGP is usually restricted to a single
carrier
for stability and policy reasons. As there is still no standard for
carrier-carrier MPLS it is not possible to have the
same MPLS service (Layer2 or Layer3 VPN) covering more than one
operator."

Does this mean than an MPLS solution for a remote office in another country cannot integrate directly with our existing MPLS here in the uk? I assume that the remote ISP's QOS responsibility finishes when their packets hit the Internet, as they would have to,
from the above snippet.

Can anyone shed some light?

EdTheLad

MPLS uses the routes in the routing table to create a LSP. When you connect carriers together there will be summarization setup between them in the form of a static route or a
dynamic routing protocol like bgp using summary addresses.
The summary is viewed as a seperate ip destination address and hence creates a new start point for an LSP and a termination point for other LSPs that match the summary.
So as you can see if you wanna connect 2 different carriers together you will need two seperate LSPs as the routing information isnt consistent.

rossonieri#1

hello,

i dont think that LSP is the issue - as long as the 2 provider have their BGP inter-connected and have an established MPLS network - and willing to provide cross-provider MPLS-VPN its done.
but that is the problem. I have seen problem arise from service-selling view. Many providers set different kind of formula to charge the traffic for example one charge by distance, one charge by time and so on- so they think better to stay alone.

cheers...