Link State Group - Cisco Catalyst 3030 Command Reference Manual

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.
Syntax Description number
upstream
downstream
Defaults The default group is group 1.
Command Modes
Interface configuration
Command History Release
12.2(25)SEE
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) or a single physical port in access or trunk
mode. 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. These groups are 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, then 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, then the associated downstream interfaces
are allowed to transition to, or remain in, a link-up state.
Follow these guidelines to avoid configuration problems:
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Cisco Catalyst Blade Switch 3030 Command Reference
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link state group [number] {upstream | downstream}
no link state group [number] {upstream | downstream}
Modification
This command was introduced.
Do not configure an EtherChannel as a downstream interface.
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.
You can configure only two link-state groups per switch.
Chapter 2
(Optional) Specify the link-state group number. 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.
Cisco Catalyst Blade Switch 3030 Cisco IOS Commands
78-17262-01