Hello all, We have setup successfully FRR as route server (IPv4) with multiple PEER (Cisco ASR), and we are happy with the first part of the configuration. When we try to configure the same with IPv6, we have multiple problem, and the BGP session is always reset. Our setup : - CISCO ASR IOS-XE 16.1 and IOS-XE 15.4 - Physical server with Bond interface (2 x 10Gbps SFP+) and 1 UTP (for management purpose). - Private AS for the route-server - Public AS for all other router Purpose of this setup : - All router will announce his own learned BGP route to the RS - The RS will redistribute one FULL table to all router. Configuration on FRR (IP add and router-ID was changed: router bgp 65129 view rs bgp router-id 192.168.1.16 bgp log-neighbor-changes neighbor 2001:db8::2 remote-as 60129 neighbor 2001:db8::2 interface br0 neighbor 2001:db8::2 update-source br0 ! address-family ipv6 unicast neighbor 2001:db8::2 activate neighbor 2001:db8::2 as-override neighbor 2001:db8::2 soft-reconfiguration inbound neighbor 2001:db8::2 route-server-client exit-address-family Configuration on PEER (IP add and router-ID was changed: router bgp 60129 bgp router-id 192.168.0.2 no bgp enforce-first-as bgp log-neighbor-changes neighbor 2001:db8::16 remote-as 65129 neighbor 2001:db8::16 update-source Port-channel5.210 ! address-family ipv6 neighbor 2001:db8::16 activate neighbor 2001:db8::16 next-hop-self neighbor 2001:db8::16 allowas-in neighbor 2001:db8::16 soft-reconfiguration inbound exit-address-family ! Debug Log of FRR (real IPv6 was changed ): 2019/01/30 08:31:50 BGP: u7:s5 add peer 2001:db8::2 2019/01/30 08:31:50 BGP: 2001:db8::2: Interface not set appropriately to handle this some attributes 2019/01/30 08:31:50 BGP: 2001:db8::2: Attribute MP_REACH_NLRI, parse error - treating as withdrawal 2019/01/30 08:31:50 BGP: 2001:db8::2 rcvd UPDATE with errors in attr(s)!! Withdrawing route. 2019/01/30 08:31:50 BGP: 2001:db8::2 [Error] Update packet error (wrong prefix length 64 for afi 1) 2019/01/30 08:31:50 BGP: 2001:db8::2 [Error] Error parsing NLRI 2019/01/30 08:31:50 BGP: %NOTIFICATION: sent to neighbor 2001:db8::2 3/10 (UPDATE Message Error/Invalid Network Field) 0 bytes 2019/01/30 08:31:50 BGP: bgp_process_packet: BGP UPDATE receipt failed for peer: 2001:db8::2 2019/01/30 08:31:50 BGP: %ADJCHANGE: neighbor 2001:db8::2(Unknown) in vrf Down BGP Notification send 2019/01/30 08:31:50 BGP: 2001:db8::2 remove from all update group 2019/01/30 08:32:02 BGP: bind to interface br0 failed, errno=1 2019/01/30 08:32:02 BGP: 2001:db8::2 unrecognized capability code: 70 - ignored 2019/01/30 08:32:02 BGP: %ADJCHANGE: neighbor 2001:db8::2(Unknown) in vrf Up 2019/01/30 08:32:02 BGP: u7:s5 add peer 2001:db8::2 2019/01/30 08:32:02 BGP: 2001:db8::2: Interface not set appropriately to handle this some attributes 2019/01/30 08:32:02 BGP: 2001:db8::2: Attribute MP_REACH_NLRI, parse error - treating as withdrawal 2019/01/30 08:32:02 BGP: 2001:db8::2 rcvd UPDATE with errors in attr(s)!! Withdrawing route. 2019/01/30 08:32:02 BGP: 2001:db8::2 [Error] Update packet error (wrong prefix length 64 for afi 1) 2019/01/30 08:32:02 BGP: 2001:db8::2 [Error] Error parsing NLRI 2019/01/30 08:32:02 BGP: %NOTIFICATION: sent to neighbor 2001:db8::2 3/10 (UPDATE Message Error/Invalid Network Field) 0 bytes 2019/01/30 08:32:02 BGP: bgp_process_packet: BGP UPDATE receipt failed for peer: 2001:db8::2 2019/01/30 08:32:02 BGP: %ADJCHANGE: neighbor 2001:db8::2(Unknown) in vrf Down BGP Notification send 2019/01/30 08:32:02 BGP: 2001:db8::2 remove from all update group 2019/01/30 08:32:09 BGP: bind to interface br0 failed, errno=1 2019/01/30 08:32:09 BGP: 2001:db8::2 unrecognized capability code: 70 - ignored 2019/01/30 08:32:09 BGP: %ADJCHANGE: neighbor 2001:db8::2(Unknown) in vrf Up 2019/01/30 08:32:09 BGP: u7:s5 add peer 2001:db8::2 2019/01/30 08:32:09 BGP: 2001:db8::2: Interface not set appropriately to handle this some attributes 2019/01/30 08:32:09 BGP: 2001:db8::2: Attribute MP_REACH_NLRI, parse error - treating as withdrawal 2019/01/30 08:32:09 BGP: 2001:db8::2 rcvd UPDATE with errors in attr(s)!! Withdrawing route. 2019/01/30 08:32:09 BGP: 2001:db8::2 [Error] Update packet error (wrong prefix length 64 for afi 1) 2019/01/30 08:32:09 BGP: 2001:db8::2 [Error] Error parsing NLRI 2019/01/30 08:32:09 BGP: %NOTIFICATION: sent to neighbor 2001:db8::2 3/10 (UPDATE Message Error/Invalid Network Field) 0 bytes 2019/01/30 08:32:09 BGP: bgp_process_packet: BGP UPDATE receipt failed for peer: 2001:db8::2 2019/01/30 08:32:09 BGP: %ADJCHANGE: neighbor 2001:db8::2(Unknown) in vrf Down BGP Notification send 2019/01/30 08:32:09 BGP: 2001:db8::2 remove from all update group Debug log from 1 PEER : Jan 30 08:34:08.582: BGP: nbr global 2001:db8::16 Open active delayed 9216ms (35000ms max, 60% jitter) Jan 30 08:34:08.583: BGP: nbr global 2001:db8::16 Active open failed - open timer running Jan 30 08:34:17.773: BGP: 2001:db8::16 active went from Idle to Active Jan 30 08:34:17.773: BGP: 2001:db8::16 open active, local address 2A02:4FE0::2 Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Adding topology IPv6 Unicast:base Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Send OPEN Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Building Enhanced Refresh capability Jan 30 08:34:17.774: BGP: 2001:db8::16 active went from Active to OpenSent Jan 30 08:34:17.774: BGP: 2001:db8::16 active sending OPEN, version 4, my as: 60129, holdtime 180 seconds, ID B9381902 Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcv message type 1, length (excl. header) 70 Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Receive OPEN Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcv OPEN, version 4, holdtime 180 seconds Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcv OPEN w/ OPTION parameter len: 60 Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 6 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 1, length 4 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has MP_EXT CAP for afi/safi: 1/1 Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 6 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 1, length 4 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has MP_EXT CAP for afi/safi: 2/1 Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 2 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 128, length 0 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has ROUTE-REFRESH capability(old) for all address-families Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 2 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 2, length 0 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has ROUTE-REFRESH capability(new) for all address-families Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 6 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 65, length 4 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has 4-byte ASN CAP for: 65129 Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 10 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 69, length 8 Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Add Path not supported for EBGP nbr 2001:db8::16. Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Add Path not supported for EBGP nbr 2001:db8::16. Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 8 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 73, length 6 Jan 30 08:34:17.774: BGP: 2001:db8::16 active unrecognized capability code: 73 - ingored Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ optional parameter type 2 (Capability) len 4 Jan 30 08:34:17.774: BGP: 2001:db8::16 active OPEN has CAPABILITY code: 64, length 2 Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act NSF OPEN has GR cap Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act NSF Peer has not restarted. Restart Time: 120 Jan 30 08:34:17.774: BGP: nbr global 2001:db8::16 neighbor does not have IPv4 MDT topology activated Jan 30 08:34:17.774: BGP: 2001:db8::16 active rcvd OPEN w/ remote AS 65129, 4-byte remote AS 65129 Jan 30 08:34:17.774: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:0) act Peer sent not matching OPEN AFCAP 0 Jan 30 08:34:17.774: BGP: 2001:db8::16 active went from OpenSent to OpenConfirm Jan 30 08:34:17.775: BGP: 2001:db8::16 active went from OpenConfirm to Established Jan 30 08:34:17.775: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) act Assigned ID Jan 30 08:34:17.775: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) Up Jan 30 08:34:17.775: %BGP-5-ADJCHANGE: neighbor 2001:db8::16 Up Jan 30 08:34:17.801: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) Remote close. Jan 30 08:34:17.801: BGP: nbr_topo global 2001:db8::16 IPv6 Unicast:base (0x7F2DB7BC45C8:1) Not scheduling for GR processing [Peer did not advertise GR cap] Jan 30 08:34:17.801: %BGP-5-NBR_RESET: Neighbor 2001:db8::16 reset (Peer closed the session) Jan 30 08:34:17.801: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) Reset (Peer closed the session). Jan 30 08:34:17.801: BGP: nbr_topo global 2001:db8::16 IPv6 Unicast:base (0x7F2DB7BC45C8:1) NSF delete stale NSF not active Jan 30 08:34:17.801: BGP: nbr_topo global 2001:db8::16 IPv6 Unicast:base (0x7F2DB7BC45C8:1) NSF no stale paths state is NSF not active Jan 30 08:34:17.802: BGP: nbr_topo global 2001:db8::16 IPv6 Unicast:base (0x7F2DB7BC45C8:1) Resetting ALL counters. Jan 30 08:34:17.802: BGP: 2001:db8::16 rcv message type 3, length (excl. header) 2 Jan 30 08:34:17.802: %BGP-3-NOTIFICATION: received from neighbor 2001:db8::16 3/10 (illegal network) 0 bytes Jan 30 08:34:17.802: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) Receive NOTIFICATION 3/10 (illegal network) 0 bytes Jan 30 08:34:17.802: BGP: 2001:db8::16 went from Established to Closing Jan 30 08:34:17.802: %BGP_SESSION-5-ADJCHANGE: neighbor 2001:db8::16 IPv6 Unicast topology base removed from session Peer closed the session Jan 30 08:34:17.802: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) Removed topology IPv6 Unicast:base Jan 30 08:34:17.802: BGP: ses global 2001:db8::16 (0x7F2DB7BC45C8:1) Removed last topology Jan 30 08:34:17.802: BGP: 2001:db8::16 closing Jan 30 08:34:17.802: BGP: 2001:db8::16 went from Closing to Idle Jan 30 08:34:17.802: %BGP-5-ADJCHANGE: neighbor 2001:db8::16 Down Peer closed the session Any help or comment will be very appreciated. Thanks in advance, Rémy