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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.
NSR ensures nonstop services when BGP has redundant processes on multiple MPUs. 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 that runs the active BGP process fails.
•
An ISSU starts on the MPU 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.
To use BGP NSR in MPLS L3VPN, you must enable RIB NSR. For information about RIB NSR, see
"Configuring basic IP
To configure BGP NSR:
Step
1.
Enter system view.
2.
Enter BGP instance view.
3.
Enable BGP NSR.
Command
system-view
bgp as-number [ instance
instance-name ]
graceful-restart
graceful-restart timer restart
timer
graceful-restart timer
wait-for-rib timer
graceful-restart timer
purge-time timer
routing."
Command
system-view
bgp as-number [ instance
instance-name ]
non-stop-routing
301
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
re-establish a session must be
less than the hold time.
The default setting is 180
seconds.
The default setting is 480
seconds.
Remarks
N/A
N/A
By default, BGP NSR is disabled.
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Troubleshooting
