[c-nsp] C2C ASR9K

[Harold Ritter (hritter)]

Hi Mohammad,

XR requires the PE to have a /32 route towards the directly connected CE. This will enable MPLS on the interface.

PE3:
router static
vrf CORE
  address-family ipv4 unicast
   172.16.23.2/32 <physical interface towards CE2>

The same thing needs to be done on PE6 towards CE7.

One more thing.

You should specify the update-source on both CE2 and CE7. For instance on CE2:

neighbor 10.1.100.7 update-source lo0

Regards,

Harold



De : cisco-nsp <cisco-nsp-bounces at puck.nether.net> de la part de Mohammad Khalil via cisco-nsp <cisco-nsp at puck.nether.net>
Date : vendredi, 19 janvier 2024 à 06:00
À : cisco-nsp at puck.nether.net <cisco-nsp at puck.nether.net>
Objet : [c-nsp] C2C ASR9K
Greetings
I am trying to configure C2C with BGP as the PE-CE routing protocol and Static as the C to CE routing protocol.
The main issue am running now is the eBGP session (VPNv4) between the CEs , routes are delivered but there is no connectivity and hence the eBGP session is not coming up.
Per my understanding , the BGP should be labelled unicast between the PE (XRV 6.6.2) and the respective CE. Before i changed the BGP session from IPv4 unicast to labeled unicast it was working (CE to CE traffic) , when I moved to the C traffic , I had to change the BGP to labeled unicast.

C1 – CE2 – PE3 – P4 – P5 – PE6 – CE7 – C8

PE3:
router bgp 100
 address-family ipv4 unicast
 !
 address-family vpnv4 unicast
 !
 neighbor 10.1.100.6
  remote-as 100
  update-source Loopback0
  address-family vpnv4 unicast

 vrf CORE
  rd 100:1
  address-family ipv4 unicast
   allocate-label all
  !
  neighbor 172.16.23.2
   remote-as 10
   address-family ipv4 labeled-unicast
    route-policy ALLOW in
    route-policy ALLOW out

CE2:
router bgp 10
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 neighbor 10.1.100.7 remote-as 7
 neighbor 10.1.100.7 ebgp-multihop 5
 neighbor 172.16.23.3 remote-as 100
 !
 address-family ipv4
  network 10.1.100.2 mask 255.255.255.255
  neighbor 172.16.23.3 activate
  neighbor 172.16.23.3 send-label
 exit-address-family
 !
 address-family vpnv4
  neighbor 10.1.100.7 activate
  neighbor 10.1.100.7 send-community extended
 exit-address-family
 !
 address-family ipv4 vrf CUST
  redistribute static
 exit-address-family

Nothing on the C except for a default route , is there anything I am missing? LDP is functioning well along the path.

Appreciated.


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