BGP for 6PE with FRR version 7.3

[KaushikNiral]

FRR version 7.3
commit Id: c0038fc

**Issue with FRR 7.3 BGP for 6PE setup **

We have been trying to use FRR as BGP for 6PE. The BGP sessions were up and also received 6PE routes from PE routers (Cisco router), however the FRR didn't show these received routes as valid and best path. Please find the screenshot attached below ( The routers with entry 1111::1/128 and 2222::/64)

It also displays the learned route as inaccessible, screenshot is attached for it below.

Could anyone please advise how to make it work?
Thanks a lot in advance.

The configuration which we used in FRR as PE router given below.
Current configuration:

!
frr version 7.3
frr defaults traditional
hostname vyatta
log syslog
service integrated-vtysh-config
!
router bgp 234
 no bgp default ipv4-unicast
 neighbor 2.2.2.2 remote-as 234
 neighbor 2.2.2.2 update-source 4.4.4.4
 neighbor 3333::5 remote-as 5
 !
 address-family ipv4 unicast
  neighbor 2.2.2.2 activate
 exit-address-family
 !
 address-family ipv6 unicast
  neighbor 3333::5 activate
 exit-address-family
 !
 address-family ipv6 labeled-unicast
  neighbor 2.2.2.2 activate
 exit-address-family
!
router ospf
 timers throttle spf 500 500 50000
 timers throttle lsa all 0
 network 4.4.4.4/32 area 0.0.0.0
 network 172.16.169.0/24 area 0.0.0.0
!
mpls ldp
 router-id 4.4.4.4
 !
 address-family ipv4
  discovery transport-address 4.4.4.4
  label local allocate host-routes
  session holdtime 30
  !
  interface dp0p192p1
  !
 exit-address-family
 !
!
line vty
!
end

To Reproduce
Please use the configuration above.

Expected behavior
The received routes from other PE router should not show as inaccessible and it should also be installed in rib table "show ipv6 route" .

Versions

• OS Kernel: Linux ubuntu 4.18.0-15-generic
• FRR Version [7.3]

[ton31337]

Could you show show ipv6 nht output? And debug bgp updates output would be useful as well. Even more, if you have a pcap, that would be cool as well.

[KaushikNiral]

Hi,
Please find our setup information.

The output of show ipv6 nht from FRR router (PE2)

The log contains bgp updates of both in and out
bgp_update.log

The packet capture is also attached below.
In the packet capture you can see the BGP update which is shared from FRR router should have nexthop as IPv4 mapped IPv6 address like ::ffff:404:404 but the update is shared with nexthop IP as 3333::5

pkt_capture_towards_P_router.pcap.zip

Thanks,
Kaushik

[ton31337]

I'll check this.

[KaushikNiral]

This issue is resolved in BGP and ZEBRA.

The output of the BGP table and RIB table is attached below.

The BGP update issue is also resolved for 6PE .
The packet capture is attached below.

6PE_bgp_update_packet.pcapng.zip

Thanks,

[KaushikNiral]

Closing this issue. It is fixed by PR #6821