Rip Configuration Commands; Checkzero - 3Com Switch 4500 Family Manual

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RIP Configuration Commands

The term router in this chapter refers to a router in a generic sense or an Ethernet switch running a
routing protocol.
RIP Configuration Commands

checkzero

Syntax
checkzero
undo checkzero
View
RIP view
Parameters
None
Description
Use the checkzero command to enable the must be zero field check for RIP-1 packets.
Use the undo checkzero command to disable the must be zero field check for RIP-1 packets.
By default, RIP-1 performs the must be zero field check.
According to the protocol (RFC 1058) specifications, some fields in RIP-1 packets must be zero and
these fields are called zero fields. You can use the checkzero command to enable/disable the must be
zero field check for RIP-1 packets. When the must be zero field check is enabled, if the must be zero
field in an incoming RIP-1 packet is non-zero, the packet will be rejected.
Examples
# Disable the must be zero field check for RIP-1 packets.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] rip
[Sysname-rip] undo checkzero
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