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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
link state group
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.
link state group [number] {upstream | downstream}
no link state group [number] {upstream | downstream}
Syntax Description
Defaults The default group is group 1.
Command Modes Interface configuration
Command History
Usage Guidelines Use the link state group interface configuration command to configure a port as an upstream or
downstream port for a specific link-state group. If the group number is omitted, the default group is
assumed.
An interface can be an aggregation of ports (an EtherChannel), a single switch port in access or trunk
mode, or a routed port. Each downstream interface can be associated with one or more upstream
interfaces. Upstream interfaces can be bundled together, and each downstream interface can be
associated with a single group consisting of multiple upstream interfaces, referred to as link-state
groups.
The link state of the downstream interfaces are dependent on the link state of the upstream interfaces in
the associated link-state group. If all of the upstream interfaces in a link-state group are in a link-down
state, the associated downstream interfaces are forced into a link-down state. If any one of the upstream
interfaces in the link-state group is in a link-up state, the associated downstream interfaces are allowed
to change to, or remain in, a link-up state.
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 ten link-state groups per switch.
number (Optional) Specify the link-state group number. The group number can
be 1 to 10.The default is 1.
upstream Configure a port as an upstream port for a specific link-state group.
downstream Configure a port as a downstream port for a specific link-state group.
Release Modification
12.2(25)SEE This command was introduced.
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