Configuring Link-State Tracking - Cisco Catalyst 4500 Series Software Configuration Manual

Configuring Link-State Tracking

Configuring Link-State Tracking
These sections describe how to configure link-state tracking ports:
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Default Link-State Tracking Configuration
No link-state groups are defined, and link-state tracking is not enabled for any group.
Link-State Tracking Configuration Guidelines
Follow these guidelines to avoid configuration problems:
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Configuring Link-State Tracking
To configure a link-state group and to assign an interface to a group, perform this task beginning in
privileged EXEC mode:
Command
Step 1
Switch# configure terminal
Step 2
Switch(config)# link state track
Step 3
Switch(config)# interface interface-id
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
27-26
Default Link-State Tracking Configuration, page 27-26
Link-State Tracking Configuration Guidelines, page 27-26
Configuring Link-State Tracking, page 27-26
Displaying Link-State Tracking Status, page 27-27
An interface that is defined as an upstream interface cannot also be defined as a downstream
interface in the same or different link-state group. The reverse is also true.
We recommend that you add the upstream interfaces to the link state group before adding the
downstream interfaces. it is because when a downstream interface is added to a link state group
without an upstream interface, the downstream interface is put in error-disabled state until an
upstream interfaces is added to the group.
An interface cannot be a member of more than one link-state group.
You can configure up to 20 link-state groups per switch.
If a SPAN destination port is configured as a downstream interface, it is error disabled when all
upstream interfaces in its group are down. When an upstream interface is configured as a SPAN
destination port, it is considered as a link down event on the interface.
number
Chapter 27 Configuring EtherChannel and Link State Tracking
Purpose
Enters global configuration mode.
Creates a link-state group, and enables link-state tracking. The
group number range is 1 to 20; the default is 1.
Specifies a physical interface or range of interfaces to configure,
and enters interface configuration mode.
Valid interfaces include switch ports in access mode or trunk
mode (IEEE 802.1q), routed ports, or multiple ports bundled into
an EtherChannel interface (static or LACP), in trunk mode.