Configuring Bgp Nsr - HP FlexFabric 12900E Series Configuration Manual

5. Both the GR restarter and the GR helper start the End-Of-RIB marker waiting timer.
The End-Of-RIB marker waiting time is set by the graceful-restart timer wait-for-rib
command. If routing information exchange is not completed within the time, the GR restarter
does not receive new routes. The GR restarter updates the RIB with the BGP routes already
learned, and removes the aged routes from the RIB. The GR helper removes the stale routes.
6. The GR restarter quits the GR process if routing information exchange is not completed within
the RIB purge timer. It updates the RIB with the BGP routes already learned, and removes the
aged 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.
As a best practice, perform the following configuration on the GR restarter and GR helper.
To configure BGP GR:
Step
1. Enter system view.
2. Enter BGP instance 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.
6. Configure the RIB purge timer.

Configuring BGP NSR

To use BGP nonstop routing (NSR), the system must have a minimum of two MPUs or two IRF
member devices.
NSR ensures nonstop services when BGP has redundant processes on multiple MPUs or IRF
member devices. In contrast to GR, NSR does not require a neighbor device to recover routing
information.
BGP NSR backs up BGP state and data information from the active BGP process to the standby
BGP process. The standby BGP process takes over when any of the following events occurs:
•
The active BGP process restarts.
•
The MPU/IRF member device that runs the active BGP process fails.
•
An ISSU starts on the MPU/IRF member device that runs the active BGP process.
When both GR and NSR are configured for BGP, NSR has a higher priority than GR. The device will
not act as the GR restarter. If the device acts as a GR helper, it cannot help the restarter to complete
GR.
Command
system-view
bgp as-number [ instance
instance-name
[ multi-session-thread ]
graceful-restart
graceful-restart timer restart
timer
graceful-restart
wait-for-rib timer
graceful-restart
purge-time timer
284
Remarks
N/A
] N/A
By default, GR capability is
disabled for BGP.
The default
seconds.
The time that a peer waits to
re-establish a session must be
less than the hold time.
timer The default
seconds.
timer The default
seconds.
setting is 150
setting is 180
setting is 480