Skip-Loopback-Test - Cisco Catalyst 3550 Command Reference Manual

Multilayer switch

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skip-loopback-test

Use the skip-loopback-test interface configuration command to configure the switch to omit the

loopback test on an interface during the switch power-on self-test (POST).

Syntax Description

This command has no arguments or keywords.

A loopback test is performed on all interfaces during POST.

Command Modes

Interface configuration

Command History

Usage Guidelines

Use this command in rare situations when an interface fails POST but the switch hardware is known to

be fully functional as is the case when the Gigabit port of a Catalyst 3550 switch with inline power

(WS-C3550-25-PWR) is connected to the Gigabit port of a Catalyst 4000 series switch with Supervisor

Model WS-X4516 running Cisco IOS release 12.2(18)EW or 12.2(20)EW. This configuration is known

to experience lost loopback packets when the switch boots up and entering this command on the interface

allows it to remain up.

Catalyst 3550 Multilayer Switch Command Reference

skip-loopback-test

no skip-loopback-test

Modification

This command was introduced.

Chapter 2 Catalyst 3550 Switch Cisco IOS Commands

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