Setting the Interval at Which LSAs Are Received

You can set the interval at which LSAs are received based on network connections and router resources.

Context

In OSPF, the defined interval at which LSAs are received is 1s. This aims to prevent network connections or frequent route flapping from consuming excessive network bandwidth or device resources.

On a stable network that requires fast route convergence, you can cancel the interval at which LSAs are received by setting the interval to 0s. After the interval is set to 0s, topology or route changes can be immediately advertised on the network through LSAs, which speeds up route convergence.

Procedure

Run system-view
The system view is displayed.
Run ospf [ process-id ]
The OSPF process view is displayed.
Run lsa-arrival-interval { interval | intelligent-timer max-interval start-interval hold-interval }
The interval at which LSAs are received is set.
- The parameter interval sets the interval at which LSAs are received, in milliseconds.
- The parameter intelligent-timer sets the interval at which router LSAs or network LSAs are received using an intelligent timer.
- The parameter max-interval sets the maximum interval at which LSAs are received, in milliseconds.
- The parameter start-interval sets the initial interval at which LSAs are received, in milliseconds.
- The parameter hold-interval sets the hold interval at which LSAs are received, in milliseconds.
Details about the interval at which LSAs are received are as follows:
1. start-interval specifies the initial interval at which LSAs are received.
2. The interval at which LSAs are received for the nth (n ≥ 2) time = hold-interval x 2 x (n-1).
3. When the interval specified in hold-interval x 2 x (n-1) reaches the maximum interval specified in max-interval, OSPF receives LSAs at the maximum interval for three consecutive times. Then, OSPF goes back to Step 3.a and receives LSAs at the initial interval specified in start-interval.
(Optional) Run lsa-arrival-interval suppress-flapping suppress-interval [ threshold threshold ]
The suppression period that takes effect when received OSPF LSAs flap is configured.

If no flapping occurs among received OSPF LSAs, the configuration of the lsa-arrival-interval command prevents the device from frequently receiving LSAs. If received OSPF LSAs flap, the configuration of the lsa-arrival-interval suppress-flapping command minimizes the impact of the flapping on services. The larger value of the two intervals specified in the commands is used as the suppression period.
Run commit
The configuration is committed.