H3C Technologies H3C S12500 Series Switches - Manual (Page 112)

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• 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).
Configuring OSPF FRR to automatically calculate a backup next hop
Step 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 you configure 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 configurations, see "Configuring routing
policies."
To configure OSPF FRR:
Step 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.
Configuring OSPF Graceful Restart
OSPF GR involves:
• IETF standard GR—Uses Opaque LSAs to implement GR.
• Non IETF standard GR—Uses link local signaling (LLS) to advertise GR capability and uses out of
band synchronization to synchronize the LSDB.
A device can act as a GR restarter and GR helper at the same time.