Cisco Catalyst 4500 Series Administration Guide

CHAPTER
26-1
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
26
Configuring EtherChannel and Link State
Tracking
Note Supervisor 6-E, Supervisor 6L-E, Catalyst 4900M, and Catalyst 4948-E do not support hw CoPP for all
IPv6 First Hop Security Features (DHCPv6 Inspection/Guard, DHCPv6 remote-ID option for Layer 2,
IPv6 “full” RA Guard, ...) over EtherChannel. If these features are applied either directly to
EtherChannel interface, on ports in the EtherChannel, or over a VLAN to which EtherChannel belongs,
they will not work.
This chapter describes how to use the command-line interface (CLI) to configure EtherChannel on the
Catalyst 4500 series switch Layer 2 or Layer 3 interfaces. It also provides guidelines, procedures, and
configuration examples.
EtherChannel provides automatic recovery for the loss of a link by redistributing the load across the
remaining links. If a link fails, EtherChannel redirects traffic from the failed link to the remaining links
in the channel without intervention. This chapter also describes how to configure link-state tracking.
This chapter includes the following major sections:
• About EtherChannel, page 26-2
• EtherChannel Configuration Guidelines and Restrictions, page 26-5
• Configuring EtherChannel, page 26-6
• Displaying EtherChannel to a Virtual Switch System, page 26-16
• Understanding Link-State Tracking, page 26-18
• Configuring Link-State Tracking, page 26-21
Note The commands in the following sections can be used on all Ethernet interfaces on a Catalyst 4500 series
switch, including the uplink ports on the supervisor engine.
Note For complete syntax and usage information for the switch commands used in this chapter, see the Cisco
Catalyst 4500 Series Switch Command Reference and related publications at this location:
http://www.cisco.com/en/US/products/hw/switches/ps4324/index.html
If a command is not in the Catalyst 4500 Series Switch Command Reference, you can locate it in the

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