Administrator Guide

Table Of Contents
Layer 2 Switching Commands 597
Loop Protection
Dell Networking N2000/N3000/N4000/N5000 Series Switches
Loop protection detects physical and logical loops between Ethernet ports on
a device. Loop protection must be enabled globally before it can be enabled at
the interface level.
Commands in this Section
This section explains the following commands:
keepalive (Interface Config)
Use the keepalive command in Interfacae Configuration mode to enable loop
protection on an interface. Use the no form of the command to return the
configuration to the defaults.
Syntax
keepalive
no keepalive
Default Configuration
Loop protection is enabled globally by default and enabled on all interfaces by
default.
Command Mode
Interface (Physical) Configuration mode
User Guidelines
Loop protection operates by unicasting a Configuration Test Protocol (CTP)
reply packet with the following field settings:
keepalive (Interface Config) show keepalive
keepalive (Global Config) show keepalive statistics
keepalive action
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