HELP! Been looking at this problem all day. Have a simple BGP config on my end (below). I have no control on the other end. Recently upgraded from 2811 to 2911. IOS: c2900-universalk9-mz.SPA.151-4.M7.bin Configs on old and new routers exactly the same.
Called our ISP. They see the same debug logs, but have no clue to fix. I can ping across fine. No MTU issues. Move connections back to old 2811 BGP comes up no problem.
!
interface Serial0/0/0
ip address X.X.X.86 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
service-module t1 fdl ansi
no cdp enable
!
router bgp 65000
bgp log-neighbor-changes
network Y.Y.Y.0
network Y.Y.Y.16 mask 255.255.255.240
neighbor X.X.X.85 remote-as 2
neighbor X.X.X.85 password 7 06252C1268715E3C5139
debug
Nov 5 11:07:05.493: BGP: Selected new router ID Y.Y.Y.17 for scope global
Nov 5 11:07:05.537: BGP: Applying map to find origin for Y.Y.Y.16/28
Nov 5 11:07:05.541: BGP: Applying map to find origin for Y.Y.Y.16/28
Nov 5 11:07:05.541: BGP: Applying map to find origin for Y.Y.Y.16/28
Nov 5 11:07:05.549: BGP: nbr global X.X.X.85 Active open failed - can't get active topologies
Nov 5 11:07:05.549: BGP: nbr global X.X.X.85 Open active delayed 11264ms (35000ms max, 60% jitter)
Nov 5 11:07:06.457: BGP: X.X.X.85 passive open to X.X.X.86
Nov 5 11:07:06.461: BGP: X.X.X.85 passive went from Idle to Connect
Nov 5 11:07:06.461: BGP: ses global X.X.X.85 (0x307CA074:0) pas Setting open delay timer to 60 seconds.
Nov 5 11:07:06.461: BGP: ses global X.X.X.85 (0x307CA074:0) pas read request no-op
Nov 5 11:07:06.521: BGP: Sched timer-wheel running slow by 8 ticks
Nov 5 11:07:16.761: BGP: X.X.X.85 active went from Idle to Active
Nov 5 11:07:16.761: BGP: X.X.X.85 open active, local address X.X.X.86
Nov 5 11:07:16.773: BGP: ses global X.X.X.85 (0x30B937F4:0) act Adding topology IPv4 Unicast:base
Nov 5 11:07:16.773: BGP: ses global X.X.X.85 (0x30B937F4:0) act Send OPEN
Nov 5 11:07:16.773: BGP: X.X.X.85 active went from Active to OpenSent
Nov 5 11:07:16.773: BGP: X.X.X.85 active sending OPEN, version 4, my as: 65000, holdtime 180 seconds, ID CD464511
Nov 5 11:07:16.785: BGP: X.X.X.85 active rcv message type 3, length (excl. header) 5
Nov 5 11:07:16.785: %BGP-3-NOTIFICATION: received from neighbor X.X.X.85 active 2/8 (no supported AFI/SAFI) 3 bytes 000000
Nov 5 11:07:16.785: BGP: ses global X.X.X.85 (0x30B937F4:0) act Receive NOTIFICATION 2/8 (no supported AFI/SAFI) 3 bytes 000000
Nov 5 11:07:16.785: BGP: ses global X.X.X.85 (0x30B937F4:0) act Reset (BGP Notification received).
Nov 5 11:07:16.785: BGP: X.X.X.85 active went from OpenSent to Closing
Nov 5 11:07:16.785: BGP: nbr_topo global X.X.X.85 IPv4 Unicast:base (0x30B937F4:0) NSF delete stale NSF not active
Nov 5 11:07:16.785: BGP: nbr_topo global X.X.X.85 IPv4 Unicast:base (0x30B937F4:0) NSF no stale paths state is NSF not active
Nov 5 11:07:16.785: BGP: nbr_topo global X.X.X.85 IPv4 Unicast:base (0x30B937F4:0) Resetting ALL counters.
Nov 5 11:07:16.785: BGP: X.X.X.85 active closing
Nov 5 11:07:16.785: BGP: ses global X.X.X.85 (0x30B937F4:0) act Session close and reset neighbor X.X.X.85 topostate
Nov 5 11:07:16.785: BGP: nbr_topo global X.X.X.85 IPv4 Unicast:base (0x30B937F4:0) Resetting ALL counters.
Nov 5 11:07:16.785: BGP: X.X.X.85 active went from Closing to Idle
Nov 5 11:07:16.785: %BGP_SESSION-5-ADJCHANGE: neighbor X.X.X.85 IPv4 Unicast topology base removed from session BGP Notification received
Nov 5 11:07:16.785: BGP: ses global X.X.X.85 (0x30B937F4:0) act Removed topology IPv4 Unicast:base
Nov 5 11:07:16.785: BGP: ses global X.X.X.85 (0x30B937F4:0) act Removed last topology
Nov 5 11:07:16.785: BGP: nbr global X.X.X.85 Active open failed - existing passive session
Nov 5 11:07:16.785: BGP: nbr global X.X.X.85 Active open failed - existing passive session
