Cisco Cisco Gigabit Ethernet Switch Module (CGESM) for HP Technical References
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Cisco Gigabit Ethernet Switch Module for the HP p-Class BladeSystem Command Reference Guide
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Chapter 2 CGESM Switch Cisco IOS Commands
switchport backup interface
switchport backup interface
Use the switchport backup interface interface configuration command on a Layer 2 interface to
configure Flex Links, a pair of interfaces that provide backup to each other. Use the no form of this
command to remove the Flex Links configuration.
configure Flex Links, a pair of interfaces that provide backup to each other. Use the no form of this
command to remove the Flex Links configuration.
switchport backup interface {interface-id}
no switchport backup
Syntax Description
Note
Though visible in the command-line help, VLAN interfaces are not supported.
Defaults
The default is to have no Flex Links defined.
Command Modes
Interface configuration
Command History
Usage Guidelines
With Flex Links configured, one link acts as the primary interface and forwards traffic, while the other
interface is in standby mode, ready to begin forwarding traffic if the primary link shuts down. The
interface being configured is referred to as the active link; the specified interface is identified as the
backup link. The feature provides an alternative to the Spanning Tree Protocol (STP), allowing users to
turn off STP and still retain basic link redundancy.
interface is in standby mode, ready to begin forwarding traffic if the primary link shuts down. The
interface being configured is referred to as the active link; the specified interface is identified as the
backup link. The feature provides an alternative to the Spanning Tree Protocol (STP), allowing users to
turn off STP and still retain basic link redundancy.
•
This command is available only for Layer 2 interfaces.
•
You can configure only one Flex Link backup link for any active link, and it must be a different
interface from the active interface.
interface from the active interface.
•
An interface can belong to only one Flex Link pair. An interface can be a backup link for only one
active link. An active link cannot belong to another Flex Link pair.
active link. An active link cannot belong to another Flex Link pair.
•
A backup link does not have to be the same type (Fast Ethernet or Gigabit Ethernet, for instance) as
the active link. However, you should configure both Flex Links with similar characteristics so that
there are no loops or changes in behavior if the standby link takes over traffic forwarding.
the active link. However, you should configure both Flex Links with similar characteristics so that
there are no loops or changes in behavior if the standby link takes over traffic forwarding.
interface-id
Specify the Layer 2 interface to act as a backup link to the interface being
configured. The interface can be a physical interface or port channel. The
port-channel range is 1 to 48.
configured. The interface can be a physical interface or port channel. The
port-channel range is 1 to 48.
Release
Modification
12.2(25)SE1
This command was introduced.