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request virtual-chassis mode

 

Syntax

Release Information

Command introduced in Junos OS Release 11.1.

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

Enable devices to operate as a Virtual Chassis Fabric (VCF) by setting fabric mode, or to interoperate in a mixed Virtual Chassis or VCF by setting mixed mode. You must reboot the standalone device, Virtual Chassis or VCF for this command to take effect, and the setting persists across subsequent reboot operations. You can use the reboot option to automatically reboot the device when setting fabric or mixed modes.

Note

For devices in a mixed VCF, you can set both mixed and fabric modes in the same command and then reboot the device once for both settings to take effect.

You must set fabric mode on all of the devices in a VCF.

You must set mixed mode on all devices in a Virtual Chassis or a VCF when the devices 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 combined 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. These 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.

  • EX2300 multigigabit switches (EX2300-24MP and EX2300-48MP models) with any other EX2300 model switches in an EX2300 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.

Requirements when setting mixed mode include:

  • EX4300 switches that are not multigigabit models combined with EX4300 multigigabit model (EX4300-48MP) switches form a mixed EX4300 Virtual Chassis. In this case, when you set mixed mode on the EX4300 non-multigigabit model member switches, you must also include the ieee-clause-82 option on those switches. This option sets a special port mode (IEEE Clause 82) on the Virtual Chassis ports (VCPs) that enables them to communicate when interconnected with VCPs on EX4300 multigigabit switches.

    Note

    If you remove an EX4300 member switch from a mixed EX4300 Virtual Chassis with multigigabit model members, you must disable ieee-clause-82 port mode on the switch if you want to reconfigure it as a standalone switch or use it in any other type of mixed Virtual Chassis or any non-mixed Virtual Chassis. Otherwise, the VCPs will not connect with other members in the new Virtual Chassis. To do this, use the request virtual-chassis mode mixed ieee-clause-82 disable command and then reboot the switch. To add the switch to any other type of mixed Virtual Chassis, enable mixed mode again without this option and reboot the switch again for the change to take effect.

  • Don’t enable mixed mode on a standalone device or for a member switch that is in a non-mixed Virtual Chassis or VCF. Mixed mode reduces the maximum scaling numbers for some features on the standalone switch, Virtual Chassis, or VCF to accommodate different types of devices that can be interconnected.

Best practices when setting mixed or fabric mode include:

  • Before cabling a device into a mixed Virtual Chassis or a VCF, to avoid potential traffic disruptions and configuration issues, on each device we recommend setting mixed mode for a mixed Virtual Chassis or VCF and setting fabric mode for a VCF. You must then reboot the device for the change or changes to take effect.

  • You can also change mode settings manually after a device has been added to a Virtual Chassis or VCF if you determine the settings are not the same on all the devices.

    However, if you set only some of the devices in a mixed Virtual Chassis or VCF to mixed mode, 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 force setting mixed mode on all devices in the Virtual Chassis or VCF. You can then reboot the entire Virtual Chassis or VCF, or only the devices where the mode changed. The Virtual Chassis or VCF forms when the rebooted devices are online again.

    Note

    On switches running Junos OS Release 11.4 or later, if you don’t set any of the switches in a mixed EX4200 and EX4500 Virtual Chassis to mixed mode, a mixed EX4200 and EX4500 Virtual Chassis forms where one of the switches assumes the primary role, and all other switches take on the linecard role. If you see this behavior, enter the request virtual-chassis mode mixed all-members command to set all members to mixed mode and reboot the Virtual Chassis.

Options

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.

The request virtual-chassis mode mixed disable command does not also automatically disable the mixed mode ieee-clause-82 port mode option. To disable ieee-clause-82 port mode on the device, you must include that option in the disable command as follows:

request virtual-chassis mode mixed ieee-clause-82 disable

fabricSet the device into fabric mode so it can participate as a member device 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.

You must set mixed mode with the ieee-clause-82 option on EX4300 switches that are not multigigabit models when mixing them 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