Reference v4.1.0 Instruction Manual

Network OS Command Reference 405

53-1003115-01

ipv6 unreachable

Prohibits routers from forwarding an Internet Control Message Protocol version 6 (ICMPv6)

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

the ingress port.

Synopsis ipv6 unreachable

no ipv6 unreachable

Operands None

Defaults This command is enabled by default.

Command Modes Global configuration mode

Description This command prohibits routers from forwarding an ICMPv6 Destination Unreachable Code 3 (port

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

By default, ICMPv6 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 ipv6 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