Hi,

What is the other transceiver connected to? What does it show for the port status? The ports should work at 1G. If you use the speed command to set the interface to 1000 does it work?

Thanks for the quick response!  It's good to know that it should work.

For now I'm plugging into a 10Gtek gigabit fiber to rj45 adapter (because it's small and portable!), so the chain is:

10Gtek adapter --> 10Gbase-SR SFP+ --> Fiber patch cable --> 10Gbase-SR SFP+ --> S4810

I've also tested with Trendnet gigabit adapters and a Dlink switch with a 1 gigabit SFP port, all using the same 10Gbase-SR SFP+.  None of those devices will show a connection with the S4810, though any combination of them will work with each other.

Per your suggestion, I've tried setting the port speed to 1000 on the S4810 but still with no success connecting.

I've also tried other ports.  Here is the current port config:

Dell(conf-if-te-0/1)#show config
!
interface TenGigabitEthernet 0/1
description testport
no ip address
portmode hybrid
speed 1000
no shutdown

Any suggestions on how to get gigabit working?  Thanks!

What is the output of show interfaces TenGigabitEthernet 0/1

The output of that command is:

Dell>show interfaces TenGigabitEthernet 0/1
TenGigabitEthernet 0/1 is up, line protocol is down
Description: testport
Hardware is DellEth, address is 00:01:e8:8b:0a:63
    Current address is 00:01:e8:8b:0a:63
Pluggable media present, SFP+ type is 10GBASE-SR
    Medium is MultiRate, Wavelength is 850nm
    SFP+ receive power reading is 0.3044dBm
    SFP+ transmit power reading is -2.2439dBm
Interface index is 1048708
Internet address is not set
Mode of IPv4 Address Assignment : NONE
DHCP Client-ID :0001e88b0a63
MTU 1554 bytes, IP MTU 1500 bytes
LineSpeed 1000 Mbit
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout 04:00:00
Last clearing of "show interface" counters 09:02:47
Queueing strategy: fifo
Input Statistics:
     14 packets, 896 bytes
     14 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     14 Multicasts, 0 Broadcasts, 0 Unicasts
     0 runts, 0 giants, 0 throttles
     0 CRC, 0 overrun, 14 discarded
Output Statistics:
     7 packets, 448 bytes, 0 underruns
     7 64-byte pkts, 0 over 64-byte pkts, 0 over 127-byte pkts
     0 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
     7 Multicasts, 0 Broadcasts, 0 Unicasts
     0 throttles, 0 discarded, 0 collisions, 0 wreddrops
Rate info (interval 299 seconds):
     Input 00.00 Mbits/sec,          0 packets/sec, 0.00% of line-rate
     Output 00.00 Mbits/sec,          0 packets/sec, 0.00% of line-rate
Time since last interface status change: 00:54:17

 line protocol is down

It doesn’t seem like it properly connecting as an SR connection.

Got it.  Do you have any recommendations for how to deal with that?

But the 10Gtek adapter, the Trendnet adapter, and the Dlink switch all work with each other using the SR SFPs and properly negotiate down gigabit.  

The same SR SFPs also negotiate properly to 10gbe on the S4810.  The S4810 just doesn't recognize the gigabit connections from any other device.

Do you have any suggestions or configuration changes you would recommend for getting the 10gbe ports to negotiate down to gigabit?

Thanks!

I probably would start with the 10Gtek adapter. It might not handle SR properly, some only to LC or SC fiber.

Also, just for kicks, I tried plugging in two ports on the S4810 to each other.  When speed is set to auto on both, they properly negotiate a 10Gbe connection.  When I set the speed to 1000 on one of the ports, they no longer connect.  When I set the speed to 1000 on both ports, they do connect.

Is there an issue with this switch being able to automatically negotiate to gigabit?  Do you have any ideas of how to get the original issue to work correctly?

Thanks!

https://downloads.dell.com/manuals/all-products/esuprt_ser_stor_net/esuprt_networking/esuprt_net_fxd_prt_swtchs/force10-s4810-on_administrator%20guide_en-us.pdf

Page 414. 10G doesn’t support auto negotiation , so if one port is 10G and one is 1G it won’t switch speeds. So sounds like manually setting both sides is required.