HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP Co - Page 171
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Chapter 2 Cisco Catalyst Blade Switch 3020 for HP 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 number upstream downstream (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. Defaults The default group is group 1. Command Modes Interface configuration Command History Release 12.2(25)SEF Modification This command was introduced. 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: • 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. OL-8916-01 Cisco Catalyst Blade Switch 3020 for HP Command Reference 2-143