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Command Reference

CloudEngine 8800, 7800, 6800, and 5800 V200R002C50

This document describes all the configuration commands of the device, including the command function, syntax, parameters, views, default level, usage guidelines, examples, and related commands.
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ospfv3 router-id auto-recover disable

ospfv3 router-id auto-recover disable

Function

The ospfv3 router-id auto-recover disable command disables the switch from automatically changing its router ID after a router ID conflict is detected.

The undo ospfv3 router-id auto-recover disable command enables the switch to automatically change its router ID after a router ID conflict is detected.

By default, the switch automatically changes its router ID after a router ID conflict is detected.

Format

ospfv3 router-id auto-recover disable

undo ospfv3 router-id auto-recover disable

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If the switch is enabled to automatically change its router ID after a router ID conflict is detected in an OSPFv3 area, problems such as route flapping, frequent route calculations, and protocol disconnections caused by high CPU usage can be avoided.

Procedure

If the switch finds that the router ID in the received updated LSA is the same as its router ID, it triggers router ID conflict detection.

If the switch determines that a router ID conflict occurs, it changes its router ID. If the switch has started for less than 2 hours, it generates a router ID. If the switch has started for more than 2 hours, it waits for 2 to 20 minutes randomly to check whether the router ID in the received updated LSA and its router ID are still the same. If the two router IDs are still the same, it generates a router ID. Otherwise, it retains its router ID.

NOTE:

If the router ID conflict still exists in an OSPFv3 area after the switch changes its router ID, the switch is allowed to change its router ID for at most three times by default. After the switch finds that the router ID conflict does not exist, it restarts its OSPF process to make the changed router ID take effect.

In most cases, the random waiting time of both ends with the same router ID differs, and only one end changes its router ID. However, if both ends change their router IDs after waiting for the same time, router IDs on both ends are changed.

Precautions

After the switch is enabled to automatically change its router ID if a router ID conflict is detected, the router ID automatically generated by the switch is not a local address. If you find this type of router ID during network planning, manually change the router ID to the planned ID to facilitate management. A common practice is to configure a loopback interface address as the router ID.

After changing the router ID, run the reset ospfv3 command to make the new router ID take effect.

Example

# Disable the switch from automatically changing its router ID after a router ID conflict is detected.

<HUAWEI> system-view
[~HUAWEI] ospfv3 router-id auto-recover disable
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Updated: 2019-03-21

Document ID: EDOC1000166501

Views: 43961

Downloads: 330

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