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8-34 neighbor { ip-address peer- group - name } version version-numberSyntax Description:
Purpose: Currently, the default BGP version number is 4. Cisco's implementation of BGP begins using version 4 and negotiates down to version 2. If you do not want to form a neighbor connection with a router that is not running version 4, you can lock down the version number using this command. Cisco IOS Software Release: 10.0. Peer group support was added in Release 11.0. Configuration Example: Locking Down the Neighbor BGP VersionThe following configuration locks down the version number with one neighbor to 4 and leaves the version number in auto-negotiate for the other neighbors: Router A router bgp 1 neighbor 10.1.1.2 remote-as 2 neighbor 10.1.1.2 version 4 neighbor 10.2.1.2 remote-as 3 neighbor 10.3.1.2 remote-as 4 VerificationVerify the version number by using the show ip bgp neighbors command: rtrA# show ip bgp neighbors BGP neighbor is 10.1.1.2, remote AS 2, external link Index 1, Offset 0, Mask 0x2 BGP version 4, remote router ID 10.1.1.2 BGP state = Established, table version = 7, up for 00:53:07 Last read 00:00:08, hold time is 180, keepalive interval is 60 seconds Minimum time between advertisement runs is 30 seconds Received 375 messages, 0 notifications, 0 in queue Sent 343 messages, 0 notifications, 0 in queue Prefix advertised 0, suppressed 0, withdrawn 0 Connections established 20; dropped 19 Last reset 00:53:28, due to User reset 6 accepted prefixes consume 192 bytes, maximum limit 8 Threshold for warning message 75% 0 history paths consume 0 bytes Connection state is ESTAB, I/O status: 1, unread input bytes: 0 Local host: 10.1.1.1, Local port: 11015 Foreign host: 10.1.1.2, Foreign port: 179 TroubleshootingVerify that the BGP neighbors are in the Established state using the show ip bgp neighbors command. If the neighbor relationship is not in the Established state, check for a version number mismatch between neighbors. |
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