The answer is: check the cabling.

When its dark in the cabinet and you're rearranging DACs from one layout to 
another something is bound to get plugged in wrong.

The steady blinking seems to be a feature of the QFX5100-48T. Any active port 
configured as a VCP seems to be doing it. The VCPs on the 24Q blink according 
to traffic levels.

Jonathan


From: juniper-nsp <[email protected]> on behalf of Jonathan 
Call <[email protected]>
Sent: Wednesday, January 11, 2017 2:41 PM
To: [email protected]
Subject: [j-nsp] Oddness in a QFX VCP trunk
    
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
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