C613-50100-01 REV C Command Reference for x930 Series 1196
AlliedWare Plus™ Operating System - Version 5.4.6-1.x
BGP AND BGP4+ COMMANDS
BGP
NEXTHOP-TRIGGER ENABLE
bgp nexthop-trigger enable
Overview Use this command to enable next hop address tracking. If next hop address
tracking is enabled and a next hop trigger delay interval has not been explicitly set
with the bgp nexthop-trigger delay command, the default delay interval of 5
seconds is used.
Use the no variant of this command to disable this feature.
Syntax
bgp nexthop-trigger enable
no bgp nexthop-trigger enable
Default Disabled.
Mode Global Configuration
Usage Next hop address tracking is an event driven notification system that monitors the
status of routes installed in the Routing Information Base (RIB) and reports next
hop changes that affect internal BGP (iBGP) or external BGP (eBGP) prefixes directly
to the BGP process. This improves the overall BGP convergence time, by allowing
BGP to respond rapidly to next hop changes for routes installed in the RIB.
If next hop tracking is enabled after certain routes are learned, the registration of
all the next hops of selected BGP routes are done immediately after the next hop
tracking feature is enabled.
If next hop tracking is disabled, and if there are still some selected BGP routes, BGP
deregisters the next hops of all of the selected BGP routes from the system.
If next hop tracking is disabled when next hop tracking is in the process of
execution, an error appears, and next hop tracking is not disabled. However, if the
next hop tracking timer is running at the time of negation, the next hop tracking
timer is stopped, and next hop tracking is disabled.
Example To enable next hop address tracking, enter the command:
awplus# configure terminal
awplus(config)# bgp nexthop-trigger enable
Related
Commands
bgp nexthop-trigger-count
bgp nexthop-trigger delay
show bgp nexthop-tracking (BGP only)
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