Enabling Trap - HP 6125XLG Configuration Manual

1. The BGP GR Restarter and Helper exchange Open messages for GR capability negotiation. If both
parties have the GR capability, they establish a GR-capable session. The GR Restarter sends the
GR timer set by the graceful-restart timer restart command to the GR Helper in an Open message.
2. When an active/standby switchover occurs or BGP restarts, the GR Restarter does not remove
existing BGP routes, and it still uses these routes for packet forwarding. The GR Helper marks all
routes learned from the GR Restarter as stale instead of deleting them, and it still uses these routes
for packet forwarding. During the GR process, packet forwarding is not interrupted.
3. After the active/standby switchover or BGP restart completes, the GR Restarter reestablishes a
BGP session with the GR Helper. If the BGP session fails to be established within the GR timer
advertised by the GR Restarter, the GR Helper removes the stale routes.
4. If the BGP session is established, routing information is exchanged for the GR Restarter to retrieve
route entries and for the GR Helper to recover stale routes. You can use the graceful-restart timer
wait-for-rib command to configure the time for the local router to wait for the End-Of-RIB (End of
Routing-Information-Base) marker, and control the route convergence speed. If routing information
exchange is not completed within the time, the GR Restarter does not receive new routes. Instead,
the GR Restarter updates its routing table and forwarding table with the BGP routes already
learned to complete BGP route convergence. The GR Helper removes the stale routes.
Follow these guidelines when you configure BGP GR:
The End-Of-RIB indicates the end of route updates.
•
• The maximum time to wait for the End-of-RIB marker configured on the local end is not advertised
to the peer. It controls the time for the local end to receive updates from the peer.
Perform the following configuration on the GR Restarter and GR Helper.
To configure BGP GR:
Step
1. Enter system view.
2. Enter BGP view.
3. Enable GR capability for BGP.
4. Configure the GR timer.
5. Configure the maximum time to
wait for the End-of-RIB marker.

Enabling trap

After trap is enabled for BGP, BGP generates Level-4 traps to report important events. The generated
traps are sent to the information center of the device. The output rules of the traps (whether to output the
traps and where to output) are determined according to the information center configuration. For
information center configuration, see Network Management and Monitoring Configuration Guide.
To enable trap:
Command
system-view
bgp as-number
graceful-restart
graceful-restart timer restart
timer
graceful-restart timer
wait-for-rib timer
221
Remarks
N/A
N/A
By default, GR capability is
disabled for BGP.
The default setting is 150 seconds.
The time that a peer waits to
reestablish a session must be less
than the hold time.
The default setting is 180 seconds.