JunOS : Configuring the QSFP+ uplink ports on EX4300

By | January 26, 2018

By default, all QSFP+ ports on the EX4300 chassis are configured as virtual chassis ports (vcp).

VC minimal (recommended) requirement is two ports, meaning that two out of the four ports can be used as regular 40 Gbps interfaces and/or for uplink purpose.

Let’s assume we want to use the port #0 and 1 as uplink rather than VC ports, in order to do that, issue the following commands :

Then set them as auto-negotiation :

Commit the change :

From this point, interfaces “et-0/1/0” and “et-0/1/1” are now visible as interfaces and can be configured as such.