checkzero

Function

The checkzero command enables the check on the Must-Be-Zero field in RIP packets.

The undo checkzero command cancels the check on the Must-Be-Zero field to save CPU resources. When the check is not required (that is, all neighbors are trusted), you can run this command to cancel the check.

By default, the check on the Must-Be-Zero field in RIP packets is enabled.

Format

checkzero

undo checkzero

Parameters

None

Views

RIP view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
rip	write

Usage Guidelines

Usage Scenario

The checkzero command is valid for RIP packets. For RIP-2 packets, only the packet header contains the Must-Be-Zero field.

Configuration Impact

By default, the device rejects all RIP packets whose MBZ field is not 0.

To allow a Huawei device to communicate with a non-Huawei device that allows non-zero values in the MBZ field, run the undo checkzero command on the Huawei device. This configuration is not recommended because it may increase security risks.

Example

# Enable the check on the Must-Be-Zero field in RIP packets.

<HUAWEI> system-view
[~HUAWEI] rip 1
[*HUAWEI-rip-1] checkzero