Command Line Reference Guide
Parameters
backup interface Use this option to configure a redundant Layer 2 link without using
Spanning Tree. The keywords backup interface configures a
backup port so that if the primary port fails, the backup port changes
to the up state. If the primary later comes up, it becomes the backup.
gigabit Enter the keyword gigabit if the backup port is a 1G port.
tengigabit Enter the keyword tengigabit if the backup port is a 10G port.
fortyGigE Enter the keyword fortyGigE if the backup port is a 40G port.
port-channel Enter the keywords port-channel if the backup port is a static or
dynamic port channel.
slot/port
Specify the switch-unit and port number of the backup port.
Defaults Disabled (The interface is in Layer 3 mode.)
Command Modes INTERFACE
Command History
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
If an IP address or VRRP group is assigned to the interface, you cannot use the switchport
command on the interface. To use the switchport command on an interface, only the no
ip address
and no shutdown statements must be listed in the show config
output.
When you enter the switchport command, the interface is automatically added to the
default VLAN.
To use the switchport backup interface command on a port, you must first enter
the switchport command. For more information, refer to the “Configuring Redundant Links”
section in the “Layer 2” chapter of the
FTOS Configuration Guide
.
Related
Commands
interface port-channel – creates a port channel interface.
show interfaces switchport – displays information about switchport interfaces.
Port Channel Commands
A Link Aggregation Group (LAG) is a group of links that appear to a MAC client as if they were a single link according to
IEEE 802.3ad. In FTOS, a LAG is referred to as a Port Channel.
Because each port can be assigned to only one Port Channel, and each Port Channel must have at least one port, some
of those nominally available Port Channels might have no function because they could have no members if there are not
enough ports installed. In the S5000, those ports could be provided by stack members.
For the S5000, the maximum port channel ID is 128 and the maximum members per port channel is 8.
NOTE: The FTOS implementation of LAG or Port Channel requires that you configure a LAG on both switches
manually. For information about FTOS link aggregation control protocol (LACP) for dynamic LAGs, refer to the Link
Aggregation Control Protocol (LACP) chapter. For more information about configuring and using Port Channels,
refer to the
FTOS Configuration Guide
.
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