lsdb-overflow-limit

Function

The lsdb-overflow-limit command configures a maximum number of external routes supported by the OSPF LSDB.

The undo lsdb-overflow-limit command deletes the configured maximum number of external routes supported by the OSPF LSDB.

By default, the maximum number of external routes supported by the OSPF LSDB is not set.

Format

lsdb-overflow-limit number

undo lsdb-overflow-limit [ number ]

Parameters

Parameter	Description	Value
number	Specifies the maximum number of external routes supported by the OSPF LSDB.	The value is an integer ranging from 1 to 1000000.

Parameter

Description

Value

number

Specifies the maximum number of external routes supported by the OSPF LSDB.

The value is an integer ranging from 1 to 1000000.

Views

OSPF view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
ospf	write

Usage Guidelines

Usage Scenario

If the number of external routes (carried in Type 5 LSAs) imported by OSPF exceeds the value defined, excess external routes are discarded. To address this problem, run the lsdb-overflow-limit command to configure a maximum number of external routes supported by the OSPF LSDB. If the number of external routes imported by OSPF exceeds the configured maximum number, the device deletes self-generated non-default external routes to ensure the proper forwarding of other external routes.

If OSPF is in LSDB overflow status is displayed in the output of the display ospf brief command, the OSPF LSDB in the current OSPF process is overloaded. If OSPF LSDB is approaching overflow limit is displayed in the command output, the number of external routes in the OSPF LSDB has reached or exceeded 90% of the maximum number.

The device generates alarms based on the following rules:

When the number of external routes in the OSPF LSDB reaches or exceeds 90% of the maximum number, the device generates the OSPF_1.3.6.1.4.1.2011.5.25.155.31.15 hwOspfv2LsdbApproachingOverflow alarm.
When the number of external routes in the OSPF LSDB falls below 90% of the maximum number, the device generates the OSPF_1.3.6.1.4.1.2011.5.25.155.31.16 hwOspfv2LsdbApproachingOverflowClear alarm.
When the number of external routes in the OSPF LSDB reaches the maximum number, the device generates the OSPF_1.3.6.1.4.1.2011.5.25.155.31.17 hwOspfv2LsdbOverflow alarm.
When the number of external routes in the OSPF LSDB falls below the maximum number, the device generates the OSPF_1.3.6.1.4.1.2011.5.25.155.31.18 hwOspfv2LsdbOverflowClear alarm.

Example

# Set the maximum number of external routes supported by the OSPF LSDB to 400000.

<HUAWEI> system-view
[~HUAWEI] ospf 100
[*HUAWEI-ospf-100] lsdb-overflow-limit 400000