Description

There are 4 interfaces configured as VCP by default on Juniper EX4300 devices. These interfaces cannot be used by default as uplink interfaces, unless they are removed as VC Ports and configured as [et] interface. If you are not using these interfaces, it is possible to convert them into standard ports to work as up-link [et] interfaces.

Solution

Please follow the next steps in order to configure the default VC Ports as regular Uplink ports:

  1. Identify the VC Ports that are not being used as VCP. 

    show virtual-chassis vc-port 
fpc3:
--------------------------------------------------------------------------
Interface   Type              Trunk  Status       Speed        Neighbor
or                             ID                 (mbps)       ID  Interface
PIC / Port
1/2         Configured         -1    Up           40000        3   vcp-255/1/1
1/3         Configured         -1    Up           40000        1   vcp-255/1/2
1/1         Configured               Absent  
1/0         Configured               Absent

  2. Delete the VC Ports that are not being used. 

    request virtual-chassis vc-port delete fpc-slot 3 pic-slot 1 port 1
fpc3:
--------------------------------------------------------------------------
Interface   Type              Trunk  Status       Speed        Neighbor
or                             ID                 (mbps)       ID  Interface
PIC / Port
1/2         Configured         -1    Up           40000        3   vcp-255/1/1
1/3         Configured         -1    Up           40000        1   vcp-255/1/2
1/0         Configured               Absent

    After deleting the desired port, you will no longer see it when running the command  ​'show virtual-chassis vc-port'.

  3. Once the VC Port has been deleted, you can configure it as an [et] interface (40 gig) using the following command: 

    set interfaces et-3/1/1 unit 0

    Then you will be able to see the physical interface and protocol up if you have a QSFP+ installed to it, and a cable connected. 
    show interfaces terse | match et

et-3/1/1        up          up       inet


Note: Remember these ports cannot be used for channelizing on EX4300 devices.

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