Interop LDP and Segment Routing with IP infusion and MikroTik
Introduction
During networking field day service provider 1 there was a ton of talk about segment routing (SR) and ethernet virtual private networks (EVPN). One of the biggest questions was “how do we get there?” and while we won’t examine EVPN in this post (it’s coming in a future post don’t worry) we will look at how you can take advantage of SR while still having large portions of LDP in your network.
The team here at IP architechs works on a lot of MikroTik and whitebox gear so we’ll focus on a deployment using MikroTik and IP infusion.
MPLS and IGP setup
The first thing to accomplish is end to end reachability between the provider edge (PE) routers. MikroTik doesn’t support IS-IS so we will have to perform redistribution between the IS-IS segment and the OSPF segment as seen above.
MPLS only requires the /32s of the loopbacks for functionality so redistribution is limited to the /32 loopbacks of the PE routers.
ip prefix-list LDP-PE-LOOPBACKS
seq 10 permit 100.127.2.0/24 eq 32
!
ip prefix-list SR-PE-LOOPBACKS
seq 10 permit 100.127.0.0/24 eq 32
!
route-map REDIS-OSPF-TO-ISIS permit 10
match ip address prefix-list LDP-PE-LOOPBACKS
!
route-map REDIS-ISIS-TO-OSPF permit Continue reading
