Configuring an Interval for Retransmitting LSAs Between Adjacent Switches

Context

After a switch sends an LSA to its neighboring switch, the switch waits for a response within an interval. If no response is received within the interval, the switch retransmits the LSA to the neighboring switch.

Procedure

Run system-view

The system view is displayed.
Run interface interface-type interface-number

The OSPF interface view is displayed.
(Optional) On an Ethernet interface, run undo portswitch
The interface is switched to Layer 3 mode.

By default, an Ethernet interface works in Layer 2 mode.

Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
Run ospf timer retransmit interval

An interval at which LSAs are retransmitted between adjacent switches is set.

By default, the interval is 5s.

Generally, the interval at which LSAs are retransmitted between adjacent switches must be greater than the round trip time of a packet transmitted between the two switches. Otherwise, some LSAs are retransmitted unnecessarily.