Chapter 2 Rip Configuration Commands; Rip Configuration Commands; Checkzero - 3Com 3C13618 Command Reference Manual

3Com Router Command Reference Guide — V1.00

Chapter 2 RIP Configuration Commands

2.1 RIP Configuration Commands

2.1.1 checkzero

Syntax
checkzero
undo checkzero
View
RIP view
Parameter
None
Description
Using the checkzero command, you can enable checking the zero field of RIP-1
packet. Using the undo checkzero command, you can disable checking of the zero
field of RIP-1 packet.
By default, the RIP-1 zero check is enabled.
According to RFC1058, some fields in the RIP-1 packet must be zeroes, and these
fields are called zero fields. checkzero or undo checkzero can be used to start or
cancel the checkzero operation on the RIP-1 packet. No processing will be conducted
on the received RIP-1 packet whose zero-field is not a zero.
Since a RIP-2 packet does not contain any zero fields, this command has no effect on
it.
Example
# Disable the check of the zero-field in the RIP-1 packet.
[3Com-rip]undo checkzero
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