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BGP and BGP4+ Commands
Software Reference Supplement for SwitchBlade® x8112, x908, x900 and x610 Series Switches
C613-50032-01 REV D AlliedWare Plus
TM
Operating System - Software Version 5.4.3-2.6 3.39
bgp nexthop-trigger enable (BGP and BGP4+)
Use this command to enable nexthop address tracking. If nexthop address tracking is
enabled and a nexthop trigger delay interval has not been explicitly set with the bgp
nexthop-trigger delay (BGP and BGP4+) command on page 3.38, the default delay
interval of 5 seconds is used.
Use the no variant of this command to disable this feature.
Syntax [BGP/BGP4+] bgp nexthop-trigger enable
no bgp nexthop-trigger enable
Default [BGP/BGP4+]
Disabled.
Mode [BGP/BGP4+] Global Configuration
Usage [BGP/BGP4+] Nexthop address tracking is an event driven notification system that monitors the status
of routes installed in the Routing Information Base (RIB) and reports nexthop 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
nexthop changes for routes installed in the RIB.
If nexthop tracking is enabled after certain routes are learnt, the registration of all the
nexthops of selected BGP routes are done immediately after the nexthop tracking feature
is enabled.
If nexthop tracking is disabled, and if there are still some selected BGP routes, BGP
deregisters the nexthops of all of the selected BGP routes from the system.
If nexthop tracking is disabled when nexthop tracking is in the process of execution, an
error appears, and nexthop tracking is not disabled. However, if the nexthop tracking
timer is running at the time of negation, the nexthop tracking timer is stopped, and
nexthop tracking is disabled.
Example
[BGP/BGP4+]
To enable nexthop address tracking, enter the command:
Related Commands bgp nexthop-trigger-count (BGP and BGP4+)
bgp nexthop-trigger delay (BGP and BGP4+)
show bgp nexthop-tracking (BGP)
awplus#
configure terminal
awplus(config)#
bgp nexthop-trigger enable