[j-nsp] SRLGs in Inter-Area LSPs

[Mark Tinka]

On Sunday, May 20, 2012 10:36:15 AM Łukasz Dudziński wrote:

> I didn't know that option before. It seems, it can be
> very useful in hierarchic networks. It's a pity that it
> is poor documented.

Really? I thought it was reasonably documented way back as 
Junos 8.5.

We use expanded loose hops back in Junos 9.x when we have a 
multi-level IS-IS backbone, between various Cisco and 
Juniper routers. It wasn't without its issues, but worked 
for the most part.

What we did with our second network was simply use a flat 
Level-2 IS-IS domain, as p2mp RSVP-TE needed to run across 
different parts of the country, and sticking in multiple 
levels would have rendered that service problematic to 
deploy.

But yes, BGP Label Unicast is the recommended scaling method 
for so-called "Seamless MPLS" deployments. I just think it's 
overly complicated.

Mark.