[j-nsp] Oddness in a QFX VCP trunk

[Jonathan Call]

I have four QFX set up in a lab to do some Virtual Chassis testing. The two REs are QFX5100-24Q and the two linecards are QFX5100-48T

virtual-chassis {
    preprovisioned;
    member 0 {
        role routing-engine;
        serial-number TB3714010XXX;
    }
    member 1 {
        role routing-engine;
        serial-number TB3714010XXX;
    }
    member 2 {
        role line-card;
        serial-number TR0214480XXX;
    }
    member 3 {
        role line-card;
        serial-number TR0214500XXX;
    }
}

For whatever reason the links between fpc2 and fp3 are not working:

fpc0:
--------------------------------------------------------------------------
Interface   Type              Trunk  Status       Speed        Neighbor
or                             ID                 (mbps)       ID  Interface
PIC / Port
1/0         Configured          5    Up           40000        1   vcp-255/1/0
1/1         Configured          5    Up           40000        1   vcp-255/1/1
1/2         Configured          6    Up           40000        3   vcp-255/0/50
1/3         Configured          6    Up           40000        3   vcp-255/0/51

fpc1:
--------------------------------------------------------------------------
Interface   Type              Trunk  Status       Speed        Neighbor
or                             ID                 (mbps)       ID  Interface
PIC / Port
1/0         Configured          5    Up           40000        0   vcp-255/1/0
1/1         Configured          5    Up           40000        0   vcp-255/1/1
1/2         Configured          6    Up           40000        2   vcp-255/0/50
1/3         Configured          6    Up           40000        2   vcp-255/0/51

fpc2:
--------------------------------------------------------------------------
Interface   Type              Trunk  Status       Speed        Neighbor
or                             ID                 (mbps)       ID  Interface
PIC / Port
0/50        Configured          5    Up           40000        1   vcp-255/1/2
0/51        Configured          5    Up           40000        1   vcp-255/1/3
0/52        Configured         -1    Up           40000
0/53        Configured         -1    Up           40000

fpc3:
--------------------------------------------------------------------------
Interface   Type              Trunk  Status       Speed        Neighbor
or                             ID                 (mbps)       ID  Interface
PIC / Port
0/50        Configured          5    Up           40000        0   vcp-255/1/2
0/51        Configured          5    Up           40000        0   vcp-255/1/3
0/52        Configured         -1    Up           40000
0/53        Configured         -1    Up           40000

Another curious thing is that all of the VC ports on fpc2 and fpc3 are all blinking at a steady rate.

This seems to be wired up according to Juniper's Virtual Chassis recommendations so what did I miss?

Thanks,

Jonathan