Switching

Hi all,

I'm trying to connect a QFX10008 to an EX4300 switch using a Passive DAC as uplink port and not as vcp.

I already found out that the default behavior for a 4x40G pic in the EX4300 is configured as VCP

I removed the VCP ports and configured et port, and show interfaces shows the port as up | down from the EX4300.

QFX10K - 15.1X53-D33.3

show chassis hardware
Xcvr 10 REV 740-038625 QSFP+-40G-CU5M

show interfaces et-0/0/10
Physical interface: et-0/0/10, Enabled, Physical link is Down
Link-level type: Ethernet, MTU: 1514, LAN-PHY mode, Speed: 40Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled, Media type: Fiber
Device flags : Present Running Down

EX4300 - 14.1X53-D35.3

show chassis hardware
PIC 1 REV 19 BUILTIN BUILTIN 4x 40GE QSFP+
Xcvr 0 REV 740-038625 QSFP+-40G-CU5M

shdudu@vodc-sw11.hfa> show interfaces et-0/1/0
Physical interface: et-0/1/0, Enabled, Physical link is Down
Link-level type: Ethernet, MTU: 1514, MRU: 0, Speed: 40Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled, Auto-negotiation: Enabled, Remote fault: Online,

Do I need to configure additional settings on the port?

Disable autonegotiation on both sides--this is the only way we can get our 4300's and QFX to link over 40Gb DAC.

--Paul

Hi Paul

You're right, this is the solution indeed.

Trying it couple of hours after posting this question only at the 4300 end solved the issue. 

Thanks a dozan

David