Cisco 300 Series User Manual

Spanning-Tree Commands
925 OL-32830-01 Command Line Interface Reference Guide
46
Syntax
spanning-tree loopback-guard
no spanning-tree loopback-guard
Parameters
N/A
Default Configuration
N/A
Command Mode
Global
User Guidelines
This enables shutting down all interfaces if a loopback BPDU is received on it.
Example
switchxxxxxx(config)# spanning-tree loopback-guard

Cisco 300 Series Specifications

General

Model	Cisco 300 Series
Category	Switch
Dimensions	Varies by model
Weight	Varies by model
Power over Ethernet (PoE)	Available on select models
Management	Web-based GUI, SNMP, CLI
VLANs	Up to 256
Security Features	ACLs, 802.1X, Port Security
Humidity	10% to 90% non-condensing
Ports	8, 16, 24, 48