Cisco Catalyst 4500 Series Administration Guide

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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
OL-30933-01
Chapter 5 Configuring Virtual Switching Systems
Configuring a VSS
Switch(config-vs-domain)# dual-active detection pagp
Switch(config-vs-domain)# dual-active detection pagp trust channel-group 20
Switch(config-vs-domain)# exit
Switch(config)# interface port-channel 20
Switch(config-if)# no shutdown
Switch(config-if)# exit
This example shows the error message if you try to enable PAgP dual-active detection when a trusted
port channel is not shut down first:
Switch(config)# switch virtual domain 100
Switch(config-vs-domain)# dual-active detection pagp
This example shows the error message if you try to configure trust mode for a port channel that is not
shut down first:
Switch(config)# switch virtual domain 100
Switch(config-vs-domain)# dual-active detection pagp trust channel-group 20
Trusted port-channel 20 is not administratively down. To change the pagp dual-active trust
configuration, “shutdown” the port-channel first. Remember to “no shutdown” the
port-channel afterwards.
Configuring Fast-Hello Dual-Active Detection
To configure an interface as part of a dual-active detection pair, you need to configure dual-active
fast-hello on the interface. Although fast hello dual-active detection is enabled by default, you must
configure dual-active interface pairs to act as fast hello dual-active messaging links.
To enable or disable fast-hello dual-active detection, perform this task:
Command Purpose
Step 1
Switch(config)# switch virtual domain domain_id
Enters virtual switch submode.
Step 2
Switch(config-vs-domain)# dual-active detection
fast-hello
Enables the fast hello dual-active detection method.
Note Fast hello dual-active detection is enabled by
default.
Step 3
Switch(config-vs-domain)# exit
Exits virtual switch submode.
Step 4
Switch(config)# interface type switch/slot/port
Selects the interface to configure.
Note This interface must be directly connected to
the other chassis and must not be a VSL link.
Step 5
Switch(config-if)# dual-active fast-hello
Enables fast hello dual-active detection on the
interface, automatically removes all other
configuration from the interface, and restricts the
interface to dual-active configuration commands.
Step 6
Switch(config-if)# no shutdown
Activates the interface.
Step 7
Switch(config-if)# exit
Exits interface configuration mode.
Step 8
Switch(config)# exit
Exits global configuration mode.
Step 9
Switch)# show run interface type switch/slot/port
Displays status of dual-active fast-hello
configuration.

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