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8-31 neighbor { ip-address peer- group - name } timers keepalive holdtimeSyntax Description:
Purpose: Keepalive and holdtime are common among IP routing protocols. The keepalive time indicates how often a router sends a keepalive message to a neighbor to inform the neighbor that the router is still alive and well. The holdtime is used as a deathwatch. If a keepalive message is not received within the holdtime, the neighbor is declared dead, and the session is terminated . The default value for the keepalive time is 60 seconds. The holdtime is 3 times the keepalive time, or 180 seconds. Generally, these values do not need to be changed. If you do change them, it is a good rule to make the holdtime equal to 3 times whatever keepalive value you use. Of course, the holdtime should always be greater than the keepalive time. A good practice to follow is to configure the same keepalive and holdtimes on both sides of the link. Cisco IOS Software Release: 12.0 Configuration Example: Changing the Keepalive and Holdtime ValuesChange the default settings for keepalive and holdtime to 50 and 150 seconds, respectively: Router A router bgp 1 neighbor 10.1.1.2 remote-as 2 neighbor 10.1.1.2 timers 50 150 no auto-summary VerificationVerify the new keepalive and holdtime values 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 150, keepalive interval is 50 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messages, 0 notifications, 0 in queue Sent 343 messages, 0 notifications, 0 in queue Prefix advertised 0, suppressed 0, withdrawn 0 Connections established 20; dropped 19 Last reset 00:53:28, due to User reset 6 accepted prefixes consume 192 bytes, maximum limit 8 Threshold for warning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 Troubleshooting
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