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Mapping server configuration on XR for SR vs LDP interoperability

Mario Rosi
Level 1
Level 1

I adopted this configuration on RR used also as mapping server on my MPLS SR backbone.

I need MP server because this backbone will be connected to a legacy MPLS LDP, so i need to announce via opaque type 10 in OSPF the SIDs for the LDP PE routers.

MP config

router ospf SR
log adjacency changes detail
router-id 8.8.8.8
segment-routing mpls
prefix-suppression
segment-routing prefix-sid-map advertise-local
area 0
interface Loopback0
passive enable
!
interface GigabitEthernet0/0/0/2
cost 10000
network point-to-point
!
!
!

segment-routing
 mapping-server
   prefix-sid-map
    address-family ipv4
     4.4.4.4/32 4
     5.5.5.5/32 5
     6.6.6.6/32 6
     13.13.13.13/32 13
!

...and everything is working!

My concern is that if i remove the command "segment-routing mpls" under OSPF process, the MP stop to advertise the SIDs. Actually i don't want to involve the MP that is also a RR in the SR label swapping, so i was thinking to remove the command "segment-routing mpls "on RR.

From configuration guide https://www.cisco.com/c/en/us/td/docs/routers/ncs6000/software/segment-routing/configuration/guide/b-segment-routing-cg-ncs6k/b-segment-routing-cg-ncs6k_chapter_01001.html no mention is done that i need to enable SR on MP.

Is it propedeutic to have SR enabled on the router that i want work also as MP?

Thanks

Mario

1 Accepted Solution

Accepted Solutions

Harold Ritter
Level 12
Level 12

Hi @Mario Rosi ,

Yes, it is required to configure "segment-routing mpls" under the ospf process, as this command enables the segment routing extensions. It simply won't work without it.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

View solution in original post

1 Reply 1

Harold Ritter
Level 12
Level 12

Hi @Mario Rosi ,

Yes, it is required to configure "segment-routing mpls" under the ospf process, as this command enables the segment routing extensions. It simply won't work without it.

Regards,

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México