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Link between switches not working
So this is the scenario.
I have 2 Dell Switches (A S5248F and S4148F) and i'm trying to have a link between them with a 10G SFP+ cable (P/N: 0358VV).
Now, in the console i see that the port recognize the cable but the link is not UP between them.
This is the S4148F switch
OS10(config)# do show interface ethernet 1/1/2
Ethernet 1/1/2 is up, line protocol is down
Hardware is Dell EMC Eth, address is 50:9a:4c:e4:97:42
Current address is 50:9a:4c:e4:97:42
Pluggable media present, SFP-PLUS type is SFPPLUS_10GBASE_CU5M
Wavelength is 256
Receive power reading is 0.0
Interface index is 17305094
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 0, Auto-Negotiation on
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout: 60
Last clearing of "show interface" counters: 05:04:08
Queuing strategy: fifo
Input statistics:
0 packets, 0 octets
0 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
0 Multicasts, 0 Broadcasts, 0 Unicasts
0 runts, 0 giants, 0 throttles
0 CRC, 0 overrun, 0 discarded
Output statistics:
0 packets, 0 octets
0 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
0 Multicasts, 0 Broadcasts, 0 Unicasts
0 throttles, 0 discarded, 0 Collisions, 0 wred drops
Rate Info(interval 30 seconds):
Input 0 Mbits/sec, 0 packets/sec, 0% of line rate
Output 0 Mbits/sec, 0 packets/sec, 0% of line rate
Time since last interface status change: 05:04:08
This is the S5248F switch
OS10# show interface ethernet 1/1/2
Ethernet 1/1/2 is up, line protocol is down
Hardware is Eth, address is 8c:04:ba:a9:af:c2
Current address is 8c:04:ba:a9:af:c2
Pluggable media present, SFP+ type is SFP+ 10GBASE-CR-5.0M
Wavelength is 256
Receive power reading is no power
Interface index is 12
Internet address is not set
Mode of IPv4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 0, Auto-Negotiation on
Configured FEC is off, Negotiated FEC is off
Flowcontrol rx off tx off
ARP type: ARPA, ARP Timeout: 60
Last clearing of "show interface" counters: 04:45:19
Queuing strategy: fifo
Input statistics:
17 packets, 3110 octets
4 64-byte pkts, 5 over 64-byte pkts, 2 over 127-byte pkts
6 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
17 Multicasts, 0 Broadcasts, 0 Unicasts
0 runts, 0 giants, 0 throttles
0 CRC, 0 overrun, 0 discarded
Output statistics:
81 packets, 7194 octets
68 64-byte pkts, 5 over 64-byte pkts, 2 over 127-byte pkts
6 over 255-byte pkts, 0 over 511-byte pkts, 0 over 1023-byte pkts
81 Multicasts, 0 Broadcasts, 0 Unicasts
0 throttles, 0 discarded, 0 Collisions, wred drops
Rate Info(interval seconds):
Input 0 Mbits/sec, 0 packets/sec, 0% of line rate
Output 0 Mbits/sec, 0 packets/sec, 0% of line rate
Time since last interface status change: 04:33:36
They're both connected in the same port 1/1/2
As you can see, they detect the cable but the link is down.
So far i tried to set the negotiation to auto, thinking that the problem could be a mismatch in the speed of the link.
Could it be a configuration problem, or am i missing something here?
Any help would be appreciated.
Thanks in advance.
Regards.
DELL-Josh Cr
Community Manager
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Posted February 10th, 2020 10:00
Hi,
The S5248F has the error” Receive power reading is no power”
Can you try a different transceiver?
I tried 4 different cables with the same part number, but any of those seems to work between them (S4148F and S5248F).
I know the cables work, because i tested the connection with the same cable between two S5248F and the link comes up.
I thought it could be a misconfiguration but the led doesnt even turn on when i connect the cable between the S4148F and S5248F switches.
I tried to open a support case with Dell and they said that the cable is compatible and that the link should work, but they didnt give any clue on what could be the problem.If you want to paste the "show running-config interface..." output for those two ports it may help. What brand of cable is this? Ideally it is "DELL" branded. If not, it could be something picky about the SFP on the cable. Also check to see how old the switch firmware versions are, maybe get them up to the latest OS10 version. One last ditch effort may be to try and manually configure the port on the 5248F to "10G" since it is a 25G switch. Hope it helps. Sometimes these things are hard to track down. Good luck.
Edit- Look like you did specify the cable model# which suggest it is a Dell cable.
This is the result of the command
Switch S4148F
!
interface ethernet1/1/1
no shutdown
channel-group 10
no switchport
flowcontrol receive offSwitch S5248F
!
interface ethernet1/1/1
no shutdown
channel-group 10
no switchport
flowcontrol receive offI can't set the speed of the S5248F interface to 10000 as the interface only accepts the 25000 o auto parameters.
SW-SPINE1-S5248(conf-if-eth1/1/1)# speed 10000
Error: Illegal parameter.I contacted Dell technical support and they said that the cable is compatible and it shouldn't cause any trouble between the swtiches.
Regards.
twindragons1983
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Posted May 21st, 2020 11:00
please check the below link, that may solve your issue
spiceworks
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Posted May 31st, 2020 19:00
This problem needs more testing, I suggest you try to cross-link the network cable.
In case someone finds this and is looking for an answer, the reason your switches are not connecting is because your S5248 port is set to 25Gb and won't negotiate a 10Gb link.
Individual ports on the S5200-series will not do 10Gb / 1Gb.
You need to use port groups. The ports are arranged in groups of 4 on the backplane. Each group of four can be set to common parameters. Do
>show port-group
and you'll see your arrangement. You can, in your case, on the S5248, do
> conf t
> port-group 1/1/1
> mode Eth 10g-4x
> exitWhich sets ports 1 - 4 to use 10Gb mode. In this mode, the ports support 10Gb and 1Gb transceivers.
Use node/slot/port:subport to refer to the actual ports, so in your case
> show int eth 1/1/2:1
will show the status of physical port 1/1/2.
Of course all this information is the admin guide, and it is all there if you take the time to read it.
ngocduong18
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Posted March 25th, 2026 19:51
Thank you very much! this post was 6 years ago but it is helping me today
(edited)