Configuring OSPF NSR

Nonstop routing (NSR) backs up OSPF link state information from the active process to the standby process. After an active/standby switchover, NSR can complete link state recovery and route regeneration without tearing down adjacencies or impacting forwarding services.

NSR does not require the cooperation of neighboring devices to recover routing information, and it is typically used more often than GR.

IMPORTANT:

A device that has OSPF NSR enabled cannot act as GR restarter.

To enable OSPF NSR:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter OSPF view.	ospf [ process-id \| router-id router-id \| vpn-instance vpn-instance-name ] *	N/A
3. Enable OSPF NSR.	non-stop-routing	By default, OSPF NSR is disabled. This command takes effect only for the current process. As a best practice, enable OSPF NSR for each process if multiple OSPF processes exist.

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Enter OSPF view.

ospf [ process-id | router-id router-id | vpn-instance vpn-instance-name ] *

N/A

3. Enable OSPF NSR.

non-stop-routing

By default, OSPF NSR is disabled.

This command takes effect only for the current process. As a best practice, enable OSPF NSR for each process if multiple OSPF processes exist.

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