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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 is
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.
Configuring BFD for OSPF
BFD provides a single mechanism to quickly detect and monitor the connectivity of links between
OSPF neighbors, which improves the network convergence speed. For more information about BFD,
see High Availability Configuration Guide.
OSPF supports the following BFD detection modes:
• Bidirectional control detection—Requires BFD configuration to be made on both OSPF
routers on the link.
• Single-hop echo detection—Requires BFD configuration to be made on one OSPF router on
the link.
Configuring bidirectional control detection
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Enable BFD bidirectional
control detection.
ospf bfd enable
By default, BFD bidirectional control
detection is disabled.
Both ends of a BFD session must be
on the same network segment and in
the same area.
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