This one is very strange... Has anyone seen this behavior with BGP IPv6 between Juniper (owned by Level 3, advertising routes correctly, sending default ::/0) and Cisco (6509 running 12.2.58.SXI6 advipservices, receiving all routes fine except default, hearing ::/3)? I worked with Level 3 and they confirmed they are sending ::/0 as default: show route advertising-protocol bgp 2001:1900:2100::XXX inet6.0: 11139 destinations, 43712 routes (11135 active, 0 holddown, 7 hidden) Prefix Nexthop MED Lclpref AS path * ::/0 Self I We see a ::/3: XXXXXXX#sh ip bgp ipv6 uni neigh 2001:1900:2100::XXX received-r BGP table version is 497237119, local router ID is XXX.XX.XX.XXXX Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path *> ::/3 2001:1900:2100::XXX 0 3356 i I opened a TAC case and they had me run some IPv6 BGP detailed debugging which confirmed we are receiving a ::/3 *May* *11* *18:01:07* *XXXXXXXXXXX* *67205:* *May* *11* *18:01:05.701* *CDT: * *BGP*(*1*)*:* *process* *::/3*, *next* *hop* *2001:1900:2100::XXX* (* FE80::XXXX:XXXX:XXXX:XXXX*), *metric* *0* *from* *2001:1900:2100::XXX* Cisco's next step is for us to Wireshark the interface. I have requested Level 3 engage Juniper TAC, but am not expecting them to come up with anything since they already confirmed they are sending ::/0. We have a second connection to Level 3 that is Cisco - Cisco and it is working fine. My gut says this is one of those Juniper - Cisco communications issues, but I need proof. I am just curious if anyone has seen this type of behavior. Have a great weekend. -Ben