disable icmp unreachables

disable icmp unreachables {vlan name}


Disables the generation of ICMP (Internet Control Message Protocol) unreachable messages on one or all VLAN (Virtual LAN)s.

Syntax Description


Specifies a VLAN name.



Usage Guidelines

Disables the generation of an ICMP timestamp response (type 3, code 0) when an ICMP timestamp request is received. If a VLAN is not specified, the command applies to all IP interfaces.

This command only affects the generation of certain ICMP packets. Filtering of ICMP packets usually forwarded by the switch is controlled by the access-list commands.


The following example disables the generation of ICMP unreachable messages on all VLANs:

disable icmp unreachables


This command was first available in ExtremeXOS 10.1.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.