MP-BGP over segment-routing

[username11]

Hi

I configured the MP-BGP over segment routing but there is a problem. When I launch the traceroute from CE-SR1 to CE-SR2 it is blocked at the PS-SR1 level (backbone SR-mpls)

config:

P-SR0 (route reflector)
router bgp 200
bgp cluster-id 1
bgp router-id 100.100.0.1
bgp log-neighbor-changes

no bgp default ipv4-unicast
neighbor 100.100.100.101 remote as 200
neighbor 100.100.100.100 remote as 200
address-family vpnv6 unicast
neighbor 100.100.100.100 activate
neighbor 100.100.100.100 send-community extended
neighbor 100.100.100.100 route-reflector-client
neighbor 100.100.100.100 activate
neighbor 100.100.100.101 send-community extended
neighbor 100.100.100.101 route-reflector-client

------------------------------------------------------
PE-SR1

vrf definition entreprise-B
rd 200:2

address-family ipv6
route-target export 200:2
route-target import 200:2
exit-address-family

int g0/3
vrf forwarding entreprise-B

router bgp 200
bgp router-id 100.100.100.100
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 100.100.0.1 remote-as 200
neighbor 100.100.0.1 update-source lo 0

address-family ipv4
exit-address-family

address-family vpnv6
neighbor 100.100.0.1 activate
neighbor 100.100.0.1 send-community extended
exit-address-family

address-family ipv6 vrf entreprise-B
redistribute connected
neighbor 2001:192:168:16::2 remote-as 65007
neighbor 2001:192:168:16::2 activate
exit-address-family
------------------------------------------
-------------------------------------------
CE-1

router bgp 65007
bgp router-id 7.7.7.7
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 2001:192:168:16::1 remote-as 200

address-family ipv4
exit-address-family

address-family ipv6
network 2001:192:168:3::/64
neighbor 2001:192:168:16::1 activate
exit-address-family

-----------------------------------------------------
-----------------------------------------------------
----------------------------------------------------------
----------------------------------------------------------
PE-2
vrf definition entreprise-B
rd 200:2
address-family ipv6
route-target export 200:2
route-target import 200:2
exit-address-family
int g0/3
vrf forwarding entreprise-B

router bgp 200
bgp router-id 100.100.100.101
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 100.100.0.1 remote-as 200
neighbor 100.100.0.1 update-source lo 0

address-family ipv4
exit-address-family

address-family vpnv6
neighbor 100.100.0.1 activate
neighbor 100.100.0.1 send-community extended
exit-address-family

address-family ipv6 vrf entreprise-B
redistribute connected
neighbor 2001:192.168:17::2 remote-as 65008
neighbor 2001:192.168:17::2 activate
exit-address-family
---------------------------------------------------------------
------------------------------------------------------------
CE-2
router bgp 65008
bgp router-id 8.8.8.8
bgp log-neighbor-changes
no bgp default ipv4-unicast
neighbor 2001:192:168:17::1 remote as 200

address-family ipv4
exit-address-family

address-family ipv6

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[Flavio Miranda]

You question and your config seems not aligned. Where is CE-SR1 config?

But, despite that, I saw that you are using vrf in some device and global in others. Make sure that is not the problem. Keep in mind once you created vrf, you are isonlating that routing table from the rest of the world, unless you leak routes.

[MHM Cisco World]

Check this point

you config route-target under ipv6 and the address family is  vpnv6 but neighbor is ipv4.

[Harold Ritter]

Hi @MHM Cisco World ,

It is normal to have your VPNv6 session over IPv4 transport, as the MPLS core runs IPv4.

Regards,

[MHM Cisco World]

Always your are the best.

thanks for point me.

so there is one thing else, where is the routing protocol inside mpls core,

are both PE know the lo of RR?

[Harold Ritter]

Hi @username11 ,

Can you confirm that CE1 receives the prefix advertised by PE2 via the redistribute connected and that CE2 receives the prefix advertised by PE1.

Can you post the following output:

PE-SR1:

show ip cef 100.100.100.101 detail

PE-SR2:

show ip cef 100.100.100.100 detail

Regards,

[MHM Cisco World]

in RR the neighbor update-source Lo is missing.
enter this command and check again.