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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
OL-9639-06
Chapter 34 Configuring EtherChannels and Link-State Tracking
Configuring Link-State Tracking
You can recover a downstream interface link-down condition by removing the failed downstream port
from the link-state group. To recover multiple downstream interfaces, disable the link-state group.
Configuring Link-State Tracking
These sections describe how to configure link-state tracking ports:
• Default Link-State Tracking Configuration, page 34-24
• Link-State Tracking Configuration Guidelines, page 34-24
• Configuring Link-State Tracking, page 34-24
Default Link-State Tracking Configuration
There are no link-state groups defined, and link-state tracking is not enabled for any group.
Link-State Tracking Configuration Guidelines
Follow these guidelines to avoid configuration problems:
• An interface that is defined as an upstream interface cannot also be defined as a downstream
interface in the same or a different link-state group. The reverse is also true.
• An interface cannot be a member of more than one link-state group.
• You can configure only two link-state groups per switch.
Configuring Link-State Tracking
Beginning in privileged EXEC mode, follow these steps to configure a link-state group and to assign an
interface to a group:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
link state track number Create a link-state group, and enable link-state tracking. The
group number can be 1 to 2; the default is 1.
Step 3
interface interface-id Specify a physical interface or range of interfaces to configure,
and enter interface configuration mode.
Valid interfaces include switch ports in access or trunk mode
(IEEE 802.1q), routed ports, or multiple ports bundled into an
EtherChannel interface (static or LACP), also in trunk mode.
Step 4
no shutdown Enable the port, if necessary. By default, UNIs and ENIs are
disabled, and NNIs are enabled.
Step 5
link state group [number] {upstream |
downstream}
Specify a link-state group, and configure the interface as either
an upstream or downstream interface in the group.The group
number can be 1 to 2; the default is 1.