H3C Technologies H3C SR8800 - Manual (Page 116)

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Step Command Remarks
2. Enter OSPF view.
ospf [ process-id | router-id router-id |
vpn-instance vpn-instance-name ] *
N/A
3. Configure the LSU
transmit rate.
transmit-pacing interval interval count count
Optional.
By default, an OSPF interface
sends up to three LSU packets
every 20 milliseconds.
Enabling OSPF ISPF
When a network topology is changed, Incremental Shortest Path First (ISPF) allows the system to
recomputes only the affected part of the shortest path tree (SPT), instead of the entire SPT.
To enable OSPF ISPF:
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 ISPF. ispf enable
Optional
Disabled by default
Configuring OSPF FRR
NOTE:
•
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 commands vlink-peer, sham-link, enable
traffic-adjustment, and enable traffic-adjustment advertise (in
MPLS Command Reference).
Introduction
When a link fails, the packets on the link are discarded, and a routing loop may occur until OSPF
completes routing convergence based on the new network topology.
You can enable OSPF fast reroute (FRR) to solve this problem.
Figure 37 Network diagram for OSPF FRR
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,