i assume i have a conf error, but can not see it no prefix is being advertised to ipv6 peer 2001:550:2:1::22 yet a similar template advertises one in v4 r1# show bgp summary IPv4 Unicast Summary: BGP router identifier 198.180.150.121, local AS number 3927 VRF default vrf-id 0 BGP table version 1201106 RIB entries 1736966, using 212 MiB of memory Peers 2, using 48 KiB of memory Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd PfxSnt Desc 38.88.248.236 4 174 166936 99 1201106 0 0 01:36:00 940141 1 N/A 192.168.254.10 4 3927 121068 151229 1201106 0 0 01:18:23 634041 753625 N/A Total number of neighbors 2 IPv6 Unicast Summary: BGP router identifier 198.180.150.121, local AS number 3927 VRF default vrf-id 0 BGP table version 304315 RIB entries 381204, using 47 MiB of memory Peers 2, using 48 KiB of memory Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd PfxSnt Desc 2001:550:2:1::22 4 174 66286 98 304315 0 0 01:35:55 192933 0 N/A fc00::10 4 3927 66566 55345 304315 0 0 01:28:16 153136 131291 N/A Total number of neighbors 2 and it admits it r1# show ip bgp neighbors 38.88.248.236 advertised-routes BGP table version is 1231961, local router ID is 198.180.150.121, vrf id 0 Default local pref 100, local AS 3927 Status codes: s suppressed, d damped, h history, u unsorted, * valid, > best, = multipath, i internal, r RIB-failure, S Stale, R Removed Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self Origin codes: i - IGP, e - EGP, ? - incomplete RPKI validation codes: V valid, I invalid, N Not found Network Next Hop Metric LocPrf Weight Path *> 198.180.150.0/24 0.0.0.0 0 32768 i Total number of prefixes 1 vs r1# show bgp neighbors 2001:550:2:1::22 advertised-routes r1# [ aside: the cli asymmetry between ipv4 and ipv6 is unkind. ] config snippets ip prefix-list export4 seq 5 permit 198.180.150.0/24 ipv6 prefix-list export6 seq 5 permit 2001:418:8006::/48 ... address-family ipv4 unicast network 198.180.150.0/24 neighbor 38.88.248.236 activate neighbor 38.88.248.236 route-map accept-all in neighbor 38.88.248.236 route-map transit-out4 out neighbor 192.168.254.10 activate exit-address-family ! address-family ipv6 unicast network 2001:418:8006::/48 neighbor 2001:550:2:1::22 activate neighbor 2001:550:2:1::22 route-map accept-all in neighbor 2001:550:2:1::22 route-map transit-out6 out neighbor fc00::10 activate exit-address-family ... route-map transit-out4 permit 20 match ip address prefix-list export4 exit ... route-map transit-out6 permit 20 match ip address prefix-list export6 exit note that only the 2001:418:8006::/64 is on the LAN interface not the /48 r1# show ipv6 route 2001:418:8006::/64 Routing entry for 2001:418:8006::/64 Known via "connected", distance 0, metric 0, best Last update 01:52:13 ago * directly connected, eno3 r1# show ipv6 route 2001:418:8006::/48 % Network not in table similarly 198.180.150.0/24 is not on the LAN, it's a /25 LAN (don't ask) r1# show ip route 198.180.150.0/25 Routing entry for 198.180.150.0/25 Known via "isis", distance 115, metric 12 Last update 01:52:33 ago 198.180.150.120, via eno3 inactive, weight 1 Routing entry for 198.180.150.0/25 Known via "connected", distance 0, metric 0, best Last update 01:53:02 ago * directly connected, eno3 r1# show ip route 198.180.150.0/24 % Network not in table but it is in bgp r1# show ip bgp 198.180.150.0/24 BGP routing table entry for 198.180.150.0/24, version 1 Paths: (2 available, best #1, table default) Advertised to non peer-group peers: 38.88.248.236 192.168.254.10 Local 0.0.0.0 from 0.0.0.0 (198.180.150.121) Origin IGP, metric 0, weight 32768, valid, sourced, local, best (Weight) Last update: Thu Sep 12 21:44:49 2024 Local 192.168.254.10 (metric 11) from 192.168.254.10 (192.168.254.10) Origin IGP, localpref 100, valid, internal Last update: Thu Sep 12 22:13:15 2024 r1# show bgp 2001:418:8006::/48 BGP routing table entry for 2001:418:8006::/48, version 1 Paths: (1 available, best #1, table default) Advertised to non peer-group peers: fc00::10 Local :: from :: (198.180.150.121) Origin IGP, metric 0, weight 32768, valid, sourced, local, best (First path received) Last update: Thu Sep 12 21:44:50 2024 is it that 198.180.150.0/25 is heard via is-is and ibgp and 2001:418:8006::/64 is not? and for sure 174 is hearing the announcement of the 198.180.150.0/24. from route-views BGP routing table entry for 198.180.150.0/24, version 322874892 Paths: (19 available, best #18, table default) Not advertised to any peer Refresh Epoch 1 3257 174 3927 randy