am I missing something 3650

[spd2612]

Cisco 3650 uplink to router is going into sfp port 1/1/4 and shows operational status down ?

I have it set as a a trunk port on the 3650 and is connected to a 10 gb SFP port on a tp-link switch which shows it is connected 

The port is obviously connected and working as everything  on the 3650 port works (all poe devices)

The connection is sfp on both sides and the switch shows it as 10 gig

the uplink is a fiber sfp patch cord why does this show operational status down

[johnd2310]

HI,

Could be the polarity of the fibre is wrong. Have you tried crossing the fibre leads on one end?

Thanks

John

[spd2612]

Dont understand what you mean?

[johnd2310]

HI,

At one end of the link change the fibre around.

https://www.flukenetworks.com/blog/cabling-chronicles/b-c-s-fiber-polarity

Thanks

John

[spd2612]

I stand corrected I dont have a standard fiber patch cord its a passive twinax sfp

[johnd2310]

HI,

Is the "passive twinax sfp" connecting the switch to the router? Does the router recognise the sfp module? Check that both devices support the twinax.

Thanks

John

[spd2612]

I have my router and a different switch connected this way and it works but when i go to the Cisco it dose not the router shows its active but the cisco switch does not

[balaji.bandi]

I have my router and a different switch connected this way

what Router model and what switch model ?

have you check the compatibility matrix ?  (on OP you posted 2 different model, is this 3850 or 3650 ?)

Can you post show interface x/x (both the devices ) - what is the log when you plug the twinax cable ?

[spd2612]

Sorry 3650

[balaji.bandi]

show interface x/x (both the devices )

[spd2612]

Its port 27 on the switch and port 1 1/4 on the 3650 you can see the switch shows it connected and the 3650 does not

[balaji.bandi]

i would expect command level output to troubleshoot as requested above. (if you need further assistance hee)

1. i would verify physical cable ok

2. port detected SFP

3. have you checked the compatability matrix ?

4.

I have my router and a different switch connected this way

what Router model and what switch model

[spd2612]

1. i would verify physical cable ok  (cable is good I have tested)

2. port detected SFP  (tp-link switch detects it as being connected and it does pass data)

3. have you checked the compatability matrix ? (not sure where that is)

4.

I have my router and a different switch connected this way

 Using the same type sfp cable between a tp-link er8411 bussines router to a tp-link TL-SG3428X Switch 

It is connected on both ends

Only the Cisco shows it as no operational status
I guess I will just let this go and connect the Cisco to my switch via cat 8  
Thought someone may know the answer here

[balaji.bandi]

at this moment still not clear other than the inputs here - i tried my best ask question - still i am not clear is the switch detected the cable ? using command level i have asked show interface x/x

May be all the cables may not support and work in cisco gear as expected. - first i would check the compatible matrix, then check Logs of the switch show logging as i mentioned before, check the show interface x/x do you see the port recognize the twinax cable ?

what brand twinax cable - cisco ?

https://tmgmatrix.cisco.com/

TP Link to TP link may have worked as you mentioned, but  TP link to cisco switch not working (this i take as limitation) until we know any better information.

[spd2612]

Ok thank you for clarifying, here is the interface output from the 3650 and my cable is
FLYPROFiber 0.5m(1.6ft) SFP+ Cable, 10G DAC Cable, SFP to SFP Twinax Cable, Passive DAC Cable for Cisco SFP-H10GB-CU0.5M, Ubiquiti, Netgear, Mikrotik, Supermicro | Length

GigabitEthernet1/1/4 is down, line protocol is down (err-disabled)
  Hardware is Gigabit Ethernet, address is 7070.8b8d.cc34 (bia 7070.8b8d.cc34)
  Description: uplink to tp-link switch
  MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive not set
  Auto-duplex, Auto-speed, link type is auto, media type is unknown
  input flow-control is on, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output never, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     Output 0 broadcasts (0 multicasts)
     0 output errors, 0 collisions, 2 interface resets
     267 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 pause output
     0 output buffer failures, 0 output buffers swapped out