Specifications

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Cisco ME 3400 Ethernet Access Switch Command Reference
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Chapter 2 Cisco ME 3400 Ethernet Access 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}
This command is supported only when the switch is running the metro access or metro IP access image.
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 two link-state groups per switch.
number (Optional) Specify the link-state group number. The group number can
be 1 to 2.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)SEG This command was introduced.