Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Configuring Interchassis Redundancy for MX Series 5G Universal Routing Platforms Using a Virtual Chassis

To provide a stateful interchassis redundancy solution for MX Series routers, you can configure a Virtual Chassis. A Virtual Chassis interconnects two MX Series routers into a logical system that you can manage as a single network element.


For recommended settings on MX Virtual Chassis devices, please consult Maximizing Scaling and Performance for MX Series Virtual Chassis on the Juniper Networks Knowledge Base.

To configure a Virtual Chassis for MX Series routers:

  1. Prepare your site for the Virtual Chassis configuration.
  2. Install Junos OS licenses on the routers to be configured as members of the Virtual Chassis.
  3. Define configuration groups for the Virtual Chassis.
  4. Create the preprovisioned member configuration on the primary router in the Virtual Chassis.
  5. Configure a heartbeat connection between the primary router and backup router.
  6. Configure enhanced IP network services on both member routers.
  7. Enable graceful Routing Engine switchover (GRES) and nonstop active routing (NSR) on both member routers.
  8. Set the preprovisioned member IDs and reboot the routers in Virtual Chassis mode.
  9. Create the Virtual Chassis ports to interconnect the member routers, and commit the Virtual Chassis configuration on the primary router.
  10. (Optional) Starting in Junos OS Release 20.2R1, enable the ephemeral configuration database.
  11. (Optional) Verify the configuration and operation of the Virtual Chassis.