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

[Mark Tinka]

On 29/Apr/19 15:32, adamv0025 at netconsultings.com wrote:

> First of all hierarchical MPLS is not for everyone so the obvious question
> is do you need to keep the domains separate due to scalability reasons?
> If not then rather than investing time into "Seamless MPLS" project invest
> the time into migrating onto common IGP which will result in a much simpler
> network (IGPs can support huge number of prefixes nowadays and  ISIS/OSPF
> can compute SPF for important prefixes first -and do by default with
> possibility to customize). 

So for the ASR920, you get about 20,000 FIB entries. That's what you
want to keep your eye on to determine whether you're at a point where
you need to do this.

Ideally, you would be carrying IGP and LDP in FIB. With BGP-SD, you can
control the number of routes you want in FIB.

Mark.