When configuring a 2 member Virtual Chassis using 2xQFX5100, there is a slight difference compared to EX Series but it’s very much similar. As this is the case, I thought I’d do a quick post (And it doubles up as documentation writing for work lol). The QFX doesn’t have dedicated VC ports or a VC module, so with this in mind you’ll have to use either 10GB SPF+ port(s) or 40GB QSFP(s) ports to connect the switches together. The method is same as Configuring Virtual Chassis on EX switch using VCEP ports, the one difference is that with the QFX you can do the entire configuration with the VCEP port pre-connected, but this wasn’t the case with EX Series. However, similarly, it’s recommended that you have Backup Routing Engine (RE) or Linecard powered off if you’re using the preprovisioned method like I am 🙂
Let’s get cracking 😀
In one of my previous post, Configuring Virtual Chassis on Juniper EX Series, it’s recommended that you have the following commands set before processing with configuring a Virtual Chassis:
set system commit synchronize set chassis redundancy graceful-switchover set routing-options nonstop-routing set protocols layer2-control nonstop-bridging
Once these have been committed, you can configure the virtual-chassis stanza.
[email protected]> show configuration virtual-chassis | display set set virtual-chassis preprovisioned set virtual-chassis no-split-detection set virtual-chassis member 0 role routing-engine set virtual-chassis member 0 serial-number TA3715110057 set virtual-chassis member 1 role routing-engine set virtual-chassis member 1 serial-number TA3715110028
Just like on EX Series, you have to set the VC-Ports on the Master Routing Engine for them to know those ports are being used as the Virtual Chassis interconnects
[email protected]> request virtual-chassis vc-port set pic-slot 0 port 48 [email protected]> request virtual-chassis vc-port set pic-slot 0 port 50
You can power up (the Backup RE), having completed the entire configuration on the Master RE. Once the Backup has booted, as done on the Master, you have to set the 40GB QSFPs ports as the VC-Ports
[email protected]> request virtual-chassis vc-port set pic-slot 0 port 48 [email protected]> request virtual-chassis vc-port set pic-slot 0 port 50
Once this is done, the Virtual Chassis is created and you’ll be kicked out of the Backup RE and will have to log back into the switch, where you will be logged into the Master Routing Engine. To verify that everything is working as expected you can run the commands show virtual-chassis vc-port and show virtual-chassis
[email protected]> show virtual-chassis vc-port fpc0: -------------------------------------------------------------------------- Interface Type Trunk Status Speed Neighbor or ID (mbps) ID Interface PIC / Port 0/48 Configured 5 Up 40000 1 vcp-255/0/48 0/50 Configured 5 Up 40000 1 vcp-255/0/50 fpc1: -------------------------------------------------------------------------- Interface Type Trunk Status Speed Neighbor or ID (mbps) ID Interface PIC / Port 0/48 Configured 5 Up 40000 0 vcp-255/0/48 0/50 Configured 5 Up 40000 0 vcp-255/0/50
[email protected]> show virtual-chassis Preprovisioned Virtual Chassis Virtual Chassis ID: 1165.24bd.5581 Virtual Chassis Mode: Enabled Mstr Mixed Route Neighbor List Member ID Status Serial No Model prio Role Mode Mode ID Interface 0 (FPC 0) Prsnt TA3715110057 qfx5100-48s-6q 129 Master* N VC 1 vcp-255/0/48 1 vcp-255/0/50 1 (FPC 1) Prsnt TA3715110028 qfx5100-48s-6q 129 Backup N VC 0 vcp-255/0/48 0 vcp-255/0/50
And you’re done! As I said, it’s very similar to configuring a Virtual Chassis on EX Series, except for a couple of small changes that could throw someone off if they didn’t know!
For more in-depth detail you can check Juniper’s TechLibrary page
Keeran Marquis
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Hey thanks for this helped me out! i got 2 qfx5100 in virtual chassis now but i cant get any config from the backup switch
never mind you have to set the config for it! thanks again this was a big help