HP VSR1000 Configuration Guide

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In Figure 37, after you enable FRR on Router B, OSPF automatically calculates or designates a backup
next hop when a link failure is detected. Packets are directed to the backup next hop. At the same time,
OSPF calculates the shortest path based on the new network topology, and forwards packets over the
path after routing convergence.
You can either configure OSPF FRR to calculate a backup next hop automatically, or to designate a
backup next hop by using a routing policy.
Configuration prerequisites
Before you configure OSPF FRR, complete the following tasks:
• Configure network layer addresses for interfaces.
• Enable OSPF.
Configuration guidelines
• Do not use FRR and BFD at the same time. Otherwise, FRR may fail to take effect.
• Do not use the fast-reroute auto command together with the command vlink-peer.
Configuring OSPF FRR to automatically calculate a backup next hop
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure the source address
of echo packets.
bfd echo-source-ip ip-address Not configured by default.
3. Enter OSPF view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
N/A
4. Enable OSPF FRR to
automatically calculate a
backup next hop.
fast-reroute auto [ abr-only ]
Not configured by default.
If abr-only is specified, the route to the
ABR is selected as the backup path.
Configuring OSPF FRR to designate a backup next hop with a routing policy
Before configuring this task, you need to use the apply fast-reroute backup-interface command to specify
a backup next hop in the routing policy to be referenced. For more information about the apply
fast-reroute backup-interface command and routing policy configuration, see "Configuring routing
poli
cies."
To configure OSPF FRR:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Configure the source address
of echo packets.
bfd echo-source-ip ip-address Not configured by default.
3. Enter OSPF view.
ospf [ process-id | router-id
router-id | vpn-instance
vpn-instance-name ] *
N/A
4. Enable OSPF FRR to
designate a backup next hop
by using a routing policy.
fast-reroute route-policy
route-policy-name
Not configured by default.

HP VSR1000 Specifications

General

Brand	HP
Model	VSR1000
Category	Network Router
Language	English