Segment routing, OSPF, and labeled interarea routes

[tomc.pnnl]

Good day -

I'm experimenting changing a network to segment routing from LDP. I'm struggling with an issue where the ABRs are advertising interarea routes in area 0, but those routes are not associated with a MPLS label. I can successfully sr-mpls ping the ABRs loopback addresses. This behavior is different from LDP, which labels the prefixes. What can I configure to have these routes labeled?

router ospf 1
 router-id 10.100.235.10
 address-family ipv4 unicast
 area 0
  network point-to-point
  mpls traffic-eng
  segment-routing mpls
  interface Loopback0
   passive enable
   prefix-sid index 1001
  !
  interface GigabitEthernet0/0/0/1
  !
 !
 area 10
  interface GigabitEthernet0/0/0/0
  !
 !        
 mpls traffic-eng router-id Loopback0
!

[Harold Ritter]

Hi @tomc.pnnl ,

You need to enable SR MPLS for all areas by configuring "segment-routing mpls" at the global ospf level.

router ospf 1

 segment-routing mpls

!

Regards,

[Elvin Arias]

Hi tomc.pnnl,

As Harold said, you just need the `segment-routing mpls` keyword globally and Segment Routing should be enabled. Beyond that, please also check the `show mpls interface` command as well as the OSPF link-state database (LSDB) for the adjacency SIDs that should be generated there.

Looking forward to hearing back from you.

Regards,

Elvin