Reference Guide

Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.1 Introduced on the S4810.
Usage
Information
Splitting a 40G port into 4x10G port is supported on standalone and stacked units.
• Split ports cannot be used as stack-link to stack an S4820T.
• The unit number with the split ports must be the default (stack-unit 0).
• This set up can be verified using CLI show system brief. If the unit ID is different
than 0, it must be renumbered to 0 before ports are split by using the
stackunit id
renumber 0 command in EXEC mode.
The quad port must be in a default configuration before it can be split into 4x10G ports. The 40G
port is lost in the config when the port is split, so be sure that the port is also removed from
other L2/L3 feature configurations.
The system must be reloaded after issuing the CLI for the change to take effect.
This command cannot be used if LR4 optics are inserted on the 40G interface.
switchport
Place an interface in Layer 2 mode.
S4820T
Syntax
switchport [backup interface {gigabit slot/port | tengigabit
slot/port | fortyGigE slot/port | port-channel number}]
To remove an interface from Layer 2 mode and place it in Layer 3 mode, enter the no
switchport command. If a switchport backup interface is configured, first remove the
backup configuration. To remove a switchport backup interface, enter the no switchport
backup interface {gigabit slot/port | tengigabit slot/port |
fortyGigE slot/port | port-channel number}
command.
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 line card and port number of the backup port.
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