PLANET XGS3-24042 - Manual (Page 400)

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47.3 OSPF GR Example
Example:
There are for switches from S1 to S4 (They are two master control board and supports OSPF GR), they
enable OSPF to implement the following functions:
1. S1 keeps traffic forwarding during the switchover, S2-S4 ensure that no routing shiver and the continuous
network traffic.
2. S1 needs to finish the switchover and restart protocol within 120s, otherwise S2 will quit GR and count
routing again.
3. S1 does not work as a OSPF GR Helper (S1 will not help S2 to process GR, but it will count routing again
when S2 processes the switchover or restart OSPF protocol).
S1
S2
S3
S4
Figure 47-2 Typical application
Steps: Since the switch enables OSPF GR by default, we only need to configure the parameters and helper
policy for OSPF GR. (the following configuration is relative with OSPF GR only and that of topology is
omitted).
S1
S1(config)#ospf graceful-restart grace-period 120
S1(config)# ospf graceful-restart helper never
S2
S2(config)# ospf graceful-restart helper max-grace-period 120
47.4 OSPF GR Troubleshooting
When you have trouble in using OSPF GR, please check the following reasons:
 Whether GR restarter switch supports OSPF GR and has two main control boards, please ensure that