Configuring BGP NSR
BGP nonstop routing (NSR) ensures continuous routing by synchronizing BGP state and data information from the active BGP process to the standby BGP process. The standby BGP process can seamlessly take over all services when the active process fails in one of the following situations:
The active BGP process restarts.
The member device that runs the active BGP process fails.
GR and NSR have the following differences:
To implement NSR, the IRF fabric must have at least two member devices because the active and standby BGP processes run on different member devices. To implement GR, the IRF fabric only needs to have one member device.
GR requires GR-capable neighbors to help restore routing information. NSR does not need help because the standby process has all the BGP state and data information of the active 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 configure BGP NSR:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enter BGP view. | bgp as-number | N/A |
3. Enable BGP NSR. | non-stop-routing | By default, BGP NSR is disabled. |