04-11-2011 10:12 AM
Dear all,
Any reason why following config would work on ISO XR3.8.4 and not 4.0.1 ?
on CRS-1 running 3.8.4, I a mable to have both IPv4 & IPV6 sessions up. howver on 4.0.1, as soon as address family IPv6 is added, v4 goes down...and v6 has not been able to be established. This a 6PE setup with MPLS / LDP toward score nodes. Below BGP seesions are towards a route reflector.
TIA
/Samir
router bgp 65101
bgp router-id 192.168.1.8
address-family ipv4 unicast
redistribute connected
!
address-family ipv6 unicast
redistribute connected
allocate-label all
!
neighbor-group IBGP
remote-as 65101
update-source Loopback0
address-family ipv4 unicast
next-hop-self
!
!
neighbor-group IPv6_IBGP
remote-as 65101
update-source Loopback0
address-family ipv6 unicast
next-hop-self
!
address-family ipv6 labeled-unicast
!
!
neighbor 192.168.1.96
use neighbor-group IBGP-PEER
description SOUTH-RR1
address-family ipv4 unicast
use af-group IBGP-PEER
!
address-family ipv6 unicast
use af-group IPv6_IBGP-PEER
04-11-2011 12:15 PM
Hello Samir,
I would remove next-hop-self in all address families and I would look at route reflector logs, and may be at a moderate debug on it to understand what is happening
You may find out that the BGP RRS is sending a BGP notification claiming about an unexpected/ offending attribute TLV.
Also are these iBGP sessions? I see different AS numbers in the neighbor groups and at the router bgp process but I guess that is only a typing error
Check also if Ipv4 connectivity between BGP endpoints works during the ipv6 AF setup to exclude problems in the forwarding plane.
Hope to help
Giuseppe
04-11-2011 01:16 PM
Many thanks Giuseppe !
Actually I think my config was not right, changed it to below config to supprt 6PE and now I can see both v4 & v6 prefixes. but sh bgp neighbor is only present for v4...where as with old config used on 3.8.4 CRS-1.
I am still puzzled with why was I able to get both prefixes as well as bgp neigbor established for old image.
So bottom line, am not really sure if my config is correct. I can see CEF labels for IPv6 prefixes. will be doing more configs tomorrow and should be able to test end to end connectivity.
Samir
neighbor 192.168.1.8
remote-as 65101
update-source Loopback0
address-family ipv4 unicast
next-hop-self
!
address-family ipv6 labeled-unicast
next-hop-self
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