lsa-arrival-interval (OSPF view)

Function

The lsa-arrival-interval command sets the interval at which LSAs are received.

The undo lsa-arrival-interval command restores the default configuration.

By default, the intelligent timer is enabled. The maximum interval at which LSAs are updated is 1000 milliseconds (ms), the initial interval is 500 ms, and the Holdtime interval is 500 ms.

Format

lsa-arrival-interval interval

lsa-arrival-interval intelligent-timer max-interval start-interval hold-interval

undo lsa-arrival-interval

Parameters

Parameter	Description	Value
interval	Specifies the interval at which LSAs are received.	The value is an integer ranging from 0 to 10000, in ms.
intelligent-timer	Enables an intelligent timer to receive LSAs.	-
max-interval	Specifies the maximum interval at which LSAs are received.	The value is an integer ranging from 1 to 300000, in ms.
start-interval	Specifies the initial interval at which LSAs are received.	The value is an integer ranging from 0 to 60000, in ms.
hold-interval	Specifies the Holdtime interval at which LSAs are received.	The value is an integer ranging from 1 to 60000, in ms.

Views

OSPF view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
ospf	write

Usage Guidelines

Usage Scenario

OSPF defines that the interval at which LSAs are received is 1s, which prevents 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 change the interval at which LSAs are received to 0s. In this manner, the device can fast respond to topology or route changes, which speeds up route convergence.

On an unstable network, routes are calculated frequently, which consumes a great number of CPU resources. In addition, LSPs that describe the unstable topology are generated and transmitted on the unstable network. Frequently processing such LSAs affects the rapid and stable operation of the entire network. You can configure an intelligent timer so that the device can dynamically adjust the interval according to the user configuration and the frequency of triggering events (such as route calculation) to speed up network convergence.

If there is no special network requirement, default values are recommended.

Implementation Procedure

After an intelligent timer is enabled, the interval at which LSAs are received is as follows:

The initial interval at which LSAs are received is specified by start-interval.
The interval at which LSAs are received for the nth (n>=2) time equals x 2(n-2).
When the interval specified by hold-interval x 2(n-2) reaches the maximum interval specified by max-interval, OSPF receives LSAs at the maximum interval for three consecutive times. Then, OSPF receives LSAs at the initial interval specified by start-interval.

Precautions

Setting the interval in the lsa-arrival-interval command to be a value less than or equal to the Holdtime interval specified in the lsa-originate-interval command is recommended.

Example

# Set the interval at which LSAs are received to 0 milliseconds.

<HUAWEI> system-view
[~HUAWEI] ospf 1
[*HUAWEI-ospf-1] lsa-arrival-interval 0