03-13-2022 11:30 AM
Hi Team,
When I am trying to create BGP session with Router A to Router B the IPv6 session is not getting established.
In Router A, i have created the session in Global routing table and in Router B, i have used VRF.
For IPv4 and IPv6 Session from Router a, i will be only advertising default route using default-originate.
After removing the default-originate, the session is getting etsablished
In router B, we could observe the below logs
RP/0/RP0/CPU0:2022 Mar 14 03:03:54.430 JST: bgp[1073]: %ROUTING-BGP-5-ADJCHANGE_DETAIL : neighbor 240b:c0e1:2550::2111:1:6a Down - BGP Notification sent, illegal network (VRF: A ; AFI/SAFI: 1/1) (AS: 12345)
Router A
Global routing table
IOS 7.3.2
NCS 5504
Router B
VRF -A
IOS 7.3.2
NCS 55A1
The config in Router A is as follows
router bgp 12345 neighbor-group BLEAF-V6
router bgp 12345 neighbor-group BLEAF-V6 remote-as 65301
router bgp 12345 neighbor-group BLEAF-V6 bfd fast-detect
router bgp 12345 neighbor-group BLEAF-V6 bfd multiplier 3
router bgp 12345 neighbor-group BLEAF-V6 bfd minimum-interval 300
router bgp 12345 neighbor-group BLEAF-V6 timers 60 180
router bgp 12345 neighbor-group BLEAF-V6 address-family ipv4 unicast
router bgp 12345 neighbor-group BLEAF-V6 address-family ipv4 unicast route-policy PASS-ALL in
router bgp 12345 neighbor-group BLEAF-V6 address-family ipv4 unicast route-policy DROP-ALL out
router bgp 12345 neighbor-group BLEAF-V6 address-family ipv4 unicast default-originate
router bgp 12345 neighbor 240b:c0e1:2550::2111:1:6b use neighbor-group BLEAF-V6
Kindly support to check this . Thanks in advance
Regards,
Akshay
03-13-2022 12:14 PM
Neighbor reach via ipv6 but you config it under address family ipv4.
03-13-2022 03:23 PM
Hello
You mention ipv4/ ipv6 bgp peering but you dont show any ipv4 neighbour statements
Regards default route- are you saying when you remove an ipv4 default route thr bgp ipv4 peering establishes?
Note by design bgp peering will not establish if you are try to peer to a rtr using just a default route.
03-13-2022 07:59 PM
Hi @akshaypb6 ,
Can you please provide the BGP configuration for Router B?
Regards,
03-14-2022 02:52 AM
at a minimum you'll need to provide the output from "show run router bgp" from both A & B devices.
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