Cisco Systems 8540 CSR, 8510 CSR appendix Direction receive transmit both, Source-port

Chapter 4 Configuring Interfaces

Configuring Snooping

	Command	Purpose
Step 1
	Router(config)# interface destination-port	Defines the interface configuration for the
	Router(config-if)#	destination (test) port.
Step 2
	Router(config-if)# shutdown	Shuts down the destination port.
Step 3
	Router(config-if)# snoop interface source-port	Defines a snoop source port and its snoop
	direction {receive transmit both}	direction. You must issue separate snoop
		interface commands for each source port.
Step 4
	Router(config-if)# no shutdown	Reenables the interface. When you bring the
		destination port back up, snooping mode is fully
		functional.
Step 5
	Router(config-if)# end	Returns to privileged EXEC mode.
	Router#
Step 6
	Router# copy system:running-config	Saves your configuration changes to NVRAM.
	nvram:startup-config

For a complete configuration example that includes port snooping, see the “Catalyst 8540 CSR with ISL, VLAN, and BVI with GEC” section on page C-1.

To disable port-based snooping on an interface, perform the following steps:

	Command	Purpose
Step 1
	Router(config)# interface fastethernet	Enters interface configuration mode for the
	slot/subslot/interface	previously configured destination port.
	or
	Router(config)# interface gigabitethernet
	slot/subslot/interface
	Router(config-if)#
Step 2
	Router(config-if)# shutdown	Shuts down the destination port.
Step 3
	Router(config-if)# no snoop interface	Disables port snooping by the destination port
	source-port	defined in Step 1 on the indicated source port.
Step 4
	Router(config-if)# no shutdown	Reenables the interface. When you bring the
		destination port back up, snooping mode is
		disabled and any existing configuration and
		connections are reestablished.
Step 5
	Router(config-if)# end	Returns to privileged EXEC mode.
	Router#
Step 6
	Router# copy system:running-config	Saves your configuration changes to NVRAM.
	nvram:startup-config

	Note	For additional information on port snooping commands, refer to the “Port Snooping
		Commands” section on page A-1.
	Layer 3 Switching Software Feature and Configuration Guide
4-40		78-6235-04, Cisco IOS Release 12.0(10)W5(18)