03-16-2009 05:20 AM - edited 03-04-2019 03:57 AM
On my router I am getting thew following notifications....
2821#*Mar 16 07:48:33.443 EDT: %BGP-3-NOTIFICATION: received from neighbor 166.53.126.165 2/8 (open: unknown subcode) 3 bytes 000101
2821#*Mar 16 07:49:06.211 EDT: %BGP-5-ADJCHANGE: neighbor 166.153.126.165 Up
*Mar 16 07:49:07.003 EDT: %BGP-3-NOTIFICATION: received from neighbor 166.53.126.165 3/1 (update malformed) 0 bytes
2821#*Mar 16 07:49:07.003 EDT: %BGP-5-ADJCHANGE: neighbor 166.53.126.165 Down BGP Notification received
2821#*Mar 16 07:49:41.027 EDT: %BGP-3-NOTIFICATION: received from neighbor 166.53.126.165 2/8 (open: unknown subcode) 3 bytes 000101
Here is my show ip bgp sum output..
2821#show ip bgp sum
BGP router identifier 10.254.11.225, local AS number 65021
BGP table version is 525, main routing table version 525
88 network entries using 11616 bytes of memory
88 path entries using 4576 bytes of memory
66/33 BGP path/bestpath attribute entries using 9768 bytes of memory
20 BGP AS-PATH entries using 480 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Bitfield cache entries: current 2 (at peak 4) using 60 bytes of memory
BGP using 26500 total bytes of memory
BGP activity 210/122 prefixes, 332/244 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
166.53.126.165 4 15270 9694 17370 0 0 0 00:12:53 Idle
168.36.144.245 4 65000 3836 3750 525 0 0 2d11h 84
and here is my config
interface Loopback0
description 2821 Loopback
ip address 10.254.11.225 255.255.255.255
!
interface GigabitEthernet0/0
ip address 10.11.1.225 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/1
ip address 166.53.126.166 255.255.255.252
duplex auto
speed auto
!
interface Serial0/1/0
no ip address
encapsulation frame-relay IETF
service-module t1 timeslots 1
frame-relay lmi-type cisco
!
interface Serial0/1/0.100 point-to-point
bandwidth 64
ip address 168.36.144.246 255.255.255.252
snmp trap link-status
frame-relay interface-dlci 100 IETF
!
router bgp 65021
no synchronization
bgp log-neighbor-changes
network 10.11.1.0 mask 255.255.255.0
network 10.11.112.0 mask 255.255.255.0
network 10.11.212.0 mask 255.255.255.0
network 10.254.11.225 mask 255.255.255.255
neighbor 166.53.126.165 remote-as 15270
neighbor 166.53.126.165 description XXXX
neighbor 166.53.126.165 version 4
neighbor 166.53.126.165 soft-reconfiguration inbound
neighbor 166.53.126.165 route-map XXXX-WEIGHT in
neighbor 166.53.126.165 unsuppress-map ADV2XXXX
neighbor 168.36.144.245 remote-as 65000
neighbor 168.36.144.245 description YYYYY
neighbor 168.36.144.245 route-map YYYYY-WEIGHT in
maximum-paths 2
no auto-summary
03-16-2009 05:41 AM
Hello Michael,
the BGP peer is trying to propose something different then expected
/8 (open: unknown subcode) 3 bytes
for example the other router could try to use multi protocol BGP to exchange information in multiple address families.
so the session is kept idle
and the first update is treated as malformed:
*Mar 16 07:49:07.003 EDT: %BGP-3-NOTIFICATION: received from neighbor 166.53.126.165 3/1 (update malformed) 0 bytes
Contact the other router administrator and check with them the configuration
Hope to help
Giuseppe
03-16-2009 06:46 AM
Thanks I will do that. What should I bee looking for that maybe wrong.
Mike
03-16-2009 06:54 AM
Hello Mike,
I don't think there is any error on your side check with them that their router is configured for simple BGP4
also known as
address-family ipv4 unicast
Hope to help
Giuseppe
03-16-2009 01:46 PM
Hi,
We have seen this happen before when the number of routes advertised by your router is > ( greater> than the maximum-prefixes allowed on your peer ( 166.53.126.165 )
What version of IOS are you running ?
You could try to bring up the session by advertising 0 routes and see if it comes up then.
-Erich
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