Configuring Ospf Frr - HPE FlexNetwork HSR6800 Configuration Manual

Step
Enter OSPF view.
2.
Enable OSPF ISPF.
3.

Configuring OSPF FRR

When a link fails, the packets on the link are discarded, and a routing loop might occur until OSPF
completes routing convergence based on the new network topology.
You can enable OSPF fast reroute (FRR) to resolve this issue.
Figure 21 Network diagram for OSPF FRR
In Figure 21, 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 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 might fail to take effect.
•
Do not use the fast-reroute auto command together with any of these commands: vlink-peer,
sham-link, enable traffic-adjustment, and enable traffic-adjustment advertise (in MPLS
Command Reference).
Configuring OSPF FRR to automatically calculate a backup next hop
To configure automatic OSPF FRR:
Step
Enter system view.
1.
Configure the source
2.
address of echo packets.
Command
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
ispf enable
Command
system-view
bfd echo-source-ip
ip-address
82
Remarks
N/A
Optional.
By default, OSPF ISPF is
disabled.
Remarks
N/A
Not configured by default.