Configuring Fast-Hello Dual-Active Detection - Cisco Catalyst 4500 Series Software Configuration Manual

Chapter 5 Configuring Virtual Switching Systems
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
Step 1
Switch(config)# switch virtual domain domain_id
Step 2
Switch(config-vs-domain)# dual-active detection
fast-hello
Step 3
Switch(config-vs-domain)# exit
Step 4
Switch(config)# interface type switch/slot/port
Step 5
Switch(config-if)# dual-active fast-hello
Step 6
Switch(config-if)# no shutdown
Step 7
Switch(config-if)# exit
Step 8
Switch(config)# exit
Step 9
Switch)# show run interface type switch/slot/port
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Purpose
Enters virtual switch submode.
Enables the fast hello dual-active detection method.
Fast hello dual-active detection is enabled by
Note
default.
Exits virtual switch submode.
Selects the interface to configure.
Note This interface must be directly connected to
the other chassis and must not be a VSL link.
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.
Activates the interface.
Exits interface configuration mode.
Exits global configuration mode.
Displays status of dual-active fast-hello
configuration.
Configuring a VSS
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