request virtual-chassis mode

 

Syntax

Release Information

Command introduced in Junos OS Release 11.1 for EX Series switches.

Command introduced in Junos OS Release 13.2X51-D20 for QFX Series devices.

fabric keyword introduced in Junos OS Release 13.2X51-D20 for EX Series switches and QFX Series devices in a Virtual Chassis Fabric (VCF).

Command introduced in Junos OS Release 13.2X51-D20 for VCF.

ieee-clause-82 mixed-mode option introduced for EX4300 switches mixed with EX4300 multigigabit switches in a Virtual Chassis in Junos OS Release 18.2R1.

Description

Configure the mode for a device or multiple devices in a Virtual Chassis or a VCF. The Virtual Chassis mode setting is maintained through reboots even though it is set in operational mode.

Fabric Mode

A device is configured in fabric mode to participate as a member device in a VCF.

Mixed Mode

A device must be configured in mixed mode when it is participating in a Virtual Chassis or a VCF with devices that have differences in how they interoperate. See Understanding Mixed EX Series and QFX Series Virtual Chassis or Understanding Mixed Virtual Chassis Fabric for details on which devices can be interconnected to form a mixed Virtual Chassis or VCF.

Note

You do not need to configure mixed mode if the only devices in your Virtual Chassis are the following combinations of switches, which form a non-mixed Virtual Chassis or VCF because the devices can run the same software images:

  • Only EX4500 and EX4550 switches in an EX Series Virtual Chassis.

  • Only QFX3500 and QFX3600 switches in a QFX Series Virtual Chassis.

  • QFX5110 and QFX5100 switches in a QFX5110 Virtual Chassis or QFX5110 VCF.

You must include the ieee-clause-82 option when setting mixed mode on EX4300 switches that are not multigigabit models for those switches to participate in an EX4300 Virtual Chassis with EX4300 multigigabit model switches (EX4300-48MP). Due to platform differences, this mode is required for other EX4300 switches to properly communicate with EX4300 multigigabit switches.

Do not enable the request virtual-chassis mode mixed command for a standalone device or for a member switch that is intended to remain in a non-mixed Virtual Chassis or VCF. Enabling this command reduces the maximum scaling numbers for some features on the switch, Virtual Chassis, or VCF.

Best Practice

For a mixed Virtual Chassis, to avoid potential traffic disruptions and configuration issues, we recommend configuring mixed mode on your device before cabling it into your Virtual Chassis, and rebooting the device to complete this configuration procedure before interconnecting it into the Virtual Chassis. Similarly, for a VCF, to avoid potential traffic disruptions and configuration issues, we recommend configuring the fabric and, if applicable, the mixed mode settings on your device and rebooting it before cabling it into the VCF. You can change the fabric and mixed mode settings manually after a device has been added to a Virtual Chassis or VCF.

If you set only some of the devices in a mixed Virtual Chassis or VCF to mixed mode using this command, the mixed Virtual Chassis or VCF might not form. If you experience this issue, enter the request virtual-chassis mode mixed all-members command to set the Virtual Chassis mode to mixed for all devices in the Virtual Chassis or VCF. You then need to reboot the devices that have been set into mixed mode to complete the procedure. The Virtual Chassis or VCF forms after the devices have rebooted.

Note

When you do not use this command to set any of the switches in a mixed EX4200 and EX4500 Virtual Chassis to mixed mode, a mixed EX4200 and EX4500 Virtual Chassis forms with one of the switches assuming the master role if the switches are running Junos OS Release 11.4 or later. All other switches in the mixed EX4200 and EX4500 Virtual Chassis are placed into the linecard role. If you experience this behavior, enter the request virtual-chassis mode mixed all-members command to set the Virtual Chassis mode to mixed for all switches in the Virtual Chassis. You will then need to reboot the switches to complete the procedure. The Virtual Chassis will form after all of the switches have rebooted.

Options

No options (default)Set the Virtual Chassis mode for all members of the Virtual Chassis or VCF.
all-members(Optional) Set the Virtual Chassis mode for all members of the Virtual Chassis or VCF.
disableDisable the Virtual Chassis fabric or mixed mode setting if it was previously enabled.
fabricSet the device into fabric mode so that the device can participate in a VCF.
local(Optional) Set the Virtual Chassis mode only on the member device where the command is issued.
member member-id(Optional) Set the Virtual Chassis mode on the specified member of the Virtual Chassis or VCF.
mixed <ieee-clause-82> Set the device into mixed mode so that the device can participate in a mixed Virtual Chassis or mixed VCF. The ieee-clause-82 mixed-mode option is required when mixing EX4300 switches that are not multigigabit models with EX4300 multigigabit (EX4300-48MP) model switches in an EX4300 Virtual Chassis.
rebootAfter applying the mode change specified by the other options, reboot the device automatically.

Required Privilege Level

system-control

List of Sample Output

request virtual-chassis mode mixed

request virtual-chassis mode fabric mixed reboot

request virtual-chassis mode mixed (with IEEE Clause 82 mode for EX4300 switches mixed with EX4300 multigigabit switches in a Virtual Chassis)

Sample Output

request virtual-chassis mode mixed

user@switch> request virtual-chassis mode mixed

Sample Output

request virtual-chassis mode fabric mixed reboot

user@switch> request virtual-chassis mode fabric mixed reboot

Sample Output

request virtual-chassis mode mixed (with IEEE Clause 82 mode for EX4300 switches mixed with EX4300 multigigabit switches in a Virtual Chassis)

user@switch> request virtual-chassis mode ieee-clause-82 mixed