Catalyst 3750-E and 3560-E Switch Cisco IOS ... - DNIP . NET

link state groupChapter 2Catalyst 3750-E and 3560-E Switch Cisco IOS Commandslink state groupUse the link state group interface configuration command to configure a port as a member of a link-stategroup. 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 Descriptionnumber (Optional) Specify the link-state group number. For a Catalyst 3750-Eswitch, the group number can be 1 to 10. For a Catalyst 3560-E switch,the group number can be from 1 to 2. The default is 1.upstreamConfigure a port as an upstream port for a specific link-state group.downstreamConfigure a port as a downstream port for a specific link-state group.Defaults The default group is group 1.Command ModesInterface configurationCommand HistoryRelease12.2(35)SE2ModificationThis command was introduced.Usage GuidelinesUse the link state group interface configuration command to configure a port as an upstream ordownstream interface for the specified link-state group. If the group number is omitted, the default groupnumber is 1.To enable link-state tracking, create a link-state group, and specify the interfaces that are assigned to thelink-state group. An interface can be an aggregation of ports (an EtherChannel), a single physical portin access or trunk mode, or a routed port. In a link-state group, these interfaces are bundled together. Thedownstream interfaces are bound to the upstream interfaces. Interfaces connected to servers are referredto as downstream interfaces, and interfaces connected to distribution switches and network devices arereferred 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 forthis release.Follow these guidelines to avoid configuration problems:• An interface that is defined as an upstream interface cannot also be defined as a downstreaminterface 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-E switch and two link-state groupsper Catalyst 3560-E switch.2-318Catalyst 3750-E and 3560-E Switch Command ReferenceOL-9776-08