Alcatel-Lucent 6850-48 Guida Di Riferimento

BGP Commands

OmniSwitch CLI Reference Guide

page 44-65

Enables or disables BGP peer automatic restart. When enabled, this peer will automatically attempt to 
restart a session with another peer after a session with that peer terminates. When disabled, this peer will 
not try to re-establish a session with another peer after the session terminates; in such a case, the other peer 
will have to restart the session for the two peers to resume communication.

ip bgp neighbor ip_address auto-restart 

32-bit IP address for the neighbor. 

This command is enabled by default.

OmniSwitch 6850, 6855, 9000, 9000E

• Use the no form of this command to disable automatic peer restart.

• After a session with another peer terminates, the local BGP speaker will wait 60 seconds before 

attempting to restart the session. If the session does not start on the first attempt a second attempt will 
be made after another 120 seconds (60x2). On each unsuccessful session attempt, the previous delay 
between restarts is multiplied by 2, up to a maximum delay of 240 seconds. An exception to this rule 
occurs when the peer session terminates on receipt of a NOTIFY message with 'unsupported option' 
code or 'unsupported capability' code; in these cases the delay between restart attempts will begin at 1 
second and multiply by 2 after each unsuccessful restart attempt (up to a maximum of 240 second 
delay).

• Disabling this option can be helpful in cases where other peers are prone to frequent flapping or send-

ing many NOTIFY messages. By not restarting sessions with unstable neighbors, the local BGP 
speaker forces those unstable neighbors to re-initialize the connection.

-> ip bgp neighbor 172.22.2.115 auto-restart

-> no ip bgp neighbor 172.22.2.115 auto-restart

Release 6.1; command was introduced.