[c-nsp] Seamless MPLS interacting with flat LDP domains

[Igor Sukhomlinov]

Hi all,

I wonder if anyone has experience with integrating a UMMT/Seamless
MPLS domain (BGP-LU running over isolated IGP regions) with an
existing flat LDP network.

The customer wants to make sure the existing LDP domain is still
running while the newer BGP enabled domain is steadily coming online,
but what is the best approach to transport the services between the
networks?

The documentation is scarce, but I have a feeling a few approaches are
available:
- service segmentation - introducing dedicated service gateways that
participate in the existing LDP and the new domain and hold the state
for all the services that need to go between the new and legacy
networks
- transport label integration - somehow exchange prefixes between
BGP-LU domain and LDP domains
- Option A/B
- complete migration - move services from the existing LDP domain to a
new BGP domain, forget about interop.

Would be great to exchange ideas and concerns on the subject.

Thx,
Igor
SDS