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Cisco Systems IntelligentGigabit Ethernet Switch Modules for the IBM BladeCenter, Software Configuration Guide
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Chapter24 Configuring EtherChann els and Layer 2 Trunk Failover
Configuring Layer 2 Trunk Failover
Layer 2 Trunk Failover Configuration Guidelines
Follow these guidelines to avoid configuration problems:
•Do not configure an internal management module interface (gi0/15 or gi0/16) as a member of a
link-state group.
•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.
•An interface cannot be a member of more than one l ink-state group.
•You can configure only two link-state groups per switch.
Configuring Layer 2 Trunk Failover
Beginning in privileged EXEC mode, follow these steps to configure a link-state group and to assign an
interface to a group:
This example shows how to create a link-state group and to configure the interfaces:
Switch# configure terminal
Switch(config)# link state track 1
Switch(config)# interface range gigabitethernet0/17 -18
Switch(config-if)# link state group 1 upstream
Switch(config-if)# interface range gigabitethernet0/1 -8
Switch(config-if)# link state group 1 downstream
Switch(config-if)# end
To disable a link-state group, use the no link state track number global configuration command.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 link state track number Create a link-state group, and enable link-state tracking. The
group number can be 1 or 2: the default is 1.
Step3 interface interface-id Specify a physical interface or range of interfaces to configure,
and enter interface configuration mode.
Valid interfaces include physical ports in access or trunk mode
(IEEE 802.1q) or multiple physical ports bundled into an
EtherChannel interface (static or LACP), also in trunk mode.
Step4 link state group [number] {upstream |
downstream}
Specify a link-state group, and configure the interface as either
an upstream or downstream interface in the group.
Step5 end Return to privileged EXEC mode.
Step6 show running-config Verify your entries.
Step7 copy running-config startup-config (Optional) Save your entries in the configuration file.