Reference v4.1.0 Instruction Manual

400 Network OS Command Reference

53-1003115-01

ip unreachable

Prohibits routers from forwarding an Internet Control Message Protocol (ICMP) Destination

Unreachable Code 3 (port unreachable) message on a point-to-point link back onto the ingress

port.

Synopsis ip unreachable

no ip unreachable

Operands None

Defaults This command is enabled by default.

Command Modes Global configuration mode

Description This command prohibits routers from forwarding a Destination Unreachable Code 3 (port

unreachable) message on point-to-point links back onto the ingress port.

By default, ICMP Destination Unreachable Code 3 messages are sent for a discarded IP packet.

You can disable the sending of these messages.

Usage Guidelines Use the no ip unreachable command to disable the sending of these messages.

This is an interface-specific configuration The configuration is persistent across a switch reload.

Examples None