Users Guide

Layer 2 Switching Commands 627
Loop Protection Commands
Dell EMC Networking N1100-ON/N1500/N2000/N2100-ON/N2200-
ON/N3000-ON/N3100-ON/N3200-ON 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.
keepalive (Interface Config)
Use the keepalive command in Interface 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 disabled globally by default and disabled on all interfaces
by default.
Command Mode
Interface (Ethernet) Configuration mode
User Guidelines
Loop protection operates by unicasting a Configuration Test Protocol (CTP)
reply packet with the following field settings:
• Source MAC Address:switch L3 MAC address
• Destination MAC Address: Switch L3 MAC address
• Ether Type: 0x0900 (LOOP)
• Skip Count: 0
• Functions: Reply
• Receipt Number: 0