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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 40 Configuring EtherChannels and Link-State Tracking
Configuring Link-State Tracking
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
• 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 Catalyst 3560-X switch.
• You can configure only ten link-state groups per Catalyst 3750-X 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:
This example shows how to create a link-sta
te group and to configure the interfaces:
Switch# configure terminal
Switch(config)# link state track
1
Switch(config)# interface range g
igabitethernet1/0/21 -22
Switch(config-if)# link state gro
up 1 upstream
Switch(config-if)# interface giga
bitethernet1/0/1
Switch(config-if)# link state gro
up 1 downstream
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. For
Catalyst 3560-X switches, the group number can be 1 to 2. For
Catalyst 3750-X switches, the group number can be 1 to 10. 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 b
undled into an
EtherChannel interface (static or LACP) that is also in trunk
mode.
Step 4
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.For Catalyst
3560-X switches, the group number can be 1 to 2. For Catalyst
3750-X switches, the group number can be 1 to 10. The default
is 1.
Step 5
end Return to privileged EXEC mode.
Step 6
show running-config Verify your entries.
Step 7
copy running-config startup-config (Optional) Save your entries in the configuration file.