Link State Group - Cisco Catalyst 3750-X Command Reference Manual

Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands

link state group

Use the link state group interface configuration command to configure a port as a member of a link-state
group. Use the no form of this command to remove the port from the link-state group.
Syntax Description
number
upstream
downstream
Defaults The default group is group 1.
Command Modes Interface configuration
Command History Release
12.2(53)SE2
Usage Guidelines Use the link state group interface configuration command to configure a port as an upstream or
downstream interface for the specified link-state group. If the group number is omitted, the default group
number is 1.
To enable link-state tracking, create a link-state group, and specify the interfaces that are assigned to the
link-state group. An interface can be an aggregation of ports (an EtherChannel), a single physical port
in access or trunk mode, or a routed port. In a link-state group, these interfaces are bundled together. The
downstream interfaces are bound to the upstream interfaces. Interfaces connected to servers are referred
to as downstream interfaces, and interfaces connected to distribution switches and network devices are
referred to as upstream interfaces.
For more information about the interactions between the downstream and upstream interfaces, see the
"Configuring EtherChannels and Link-State Tracking" chapter of the software configuration guide for
this release.
Follow these guidelines to avoid configuration problems:
•
•
•
OL-29704-01
link state group [number] {upstream | downstream}
no link state group [number] {upstream | downstream}
Modification
This command was introduced.
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 ten link-state groups per Catalyst 3750-X switch and two link-state groups
per Catalyst 3560-X switch.
(Optional) Specify the link-state group number. For a Catalyst 3750-X
switch, the group number can be 1 to 10. For a Catalyst 3560-X switch,
the group number can be from 1 to 2. The default is 1.
Configure a port as an upstream port for a specific link-state group.
Configure a port as a downstream port for a specific link-state group.
Catalyst 3750-X and 3560-X Switch Command Reference
link state group
2-351