If there are multiple neighboring switches or a large number of LSA packets are flooded, a neighboring switch may be inundated with LSA packets and become overwhelmed processing them. This may cause the neighboring switch to discard Hello packets that are used to maintain the OSPF neighbor relationships, resulting in interruptions to the neighbor relationships. More packets need to be exchanged to reestablish the neighbor relationships, which further increases the possibility of neighbor relationship interruptions. To resolve this problem, you can restrict the flooding of LSA packets.
Perform the following steps on a switch running OSPF.
The system view is displayed.
The OSPF process view is displayed.
The flooding of LSA packets is restricted.
By default, 50 LSA packets can be flooded at an interval of 30s.
The flooding-control command takes effect immediately after execution.
If the flooding-control command is not run, flooding of LSA packets is automatically restricted when the number of neighboring switches exceeds 256.