Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
l2protocol-tunnel
l2protocol-tunnel
To enable protocol tunneling on an interface, use the l2protocol-tunnel command. You can enable
tunneling for the Cisco Discovery Protocol (CDP), Spanning Tree Protocol (STP), or VLAN Trunking
Protocol (VTP) packets. To disable tunneling on the interface, use the no form of this command.
l2protocol-tunnel [cdp | stp | vtp]
no l2protocol-tunnel [cdp | stp | vtp]
Syntax Description
Defaults The default is that no Layer 2 protocol packets are tunneled.
Command Modes Interface configuration mode
Command History
Usage Guidelines You must enter this command, with or without protocol types, to tunnel Layer 2 packets.
Layer 2 protocol tunneling across a service-provider network ensures that Layer 2 information is
propagated across the network to all customer locations. When protocol tunneling is enabled, protocol
packets are encapsulated with a well-known Cisco multicast address for transmission across the network.
When the packets reach their destination, the well-known MAC address is replaced by the Layer 2
protocol MAC address.
You can enable Layer 2 protocol tunneling for CDP, STP, and VTP individually or for all three protocols.
Examples This example shows how to enable protocol tunneling for the CDP packets:
Switch(config-if)# l2protocol-tunnel cdp
Switch(config-if)#
Related Commands
cdp (Optional) Enables tunneling of CDP.
stp (Optional) Enables tunneling of STP.
vtp (Optional) Enables tunneling of VTP.
Release Modification
12.2(18)EW Support for this command was introduced on the Catalyst 4500 series switch.
Command Description
l2protocol-tunnel cos Configures the class of service (CoS) value for all tunneled
Layer 2 protocol packets.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E