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

[adamv0025 at netconsultings.com]

> Mark Tinka
> Sent: Tuesday, April 30, 2019 1:49 PM
> 
> 
> 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.
> 
Also with OSPF prefix-suppression you can reduce the OSPF footprint to mere
loopbacks (i.e. excluding all p2p links). 

adam