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5897
October 13th, 2022 09:00
Connection DELL S5248F-ON to Cisco switch
Hello together,
I am trying to connect one of my DELL S5248F-ON switches to an existing network with CISCO switches. The connection should not be able to do much, it is enough if two VLANs are connected over it.
Both switches (DELL and CISCO) have 25GB ports and corresponding SFP modules. The DELL switch has a SFP module from DELL and the CISCO switch has one from CISCO.
Unfortunately I don't get an uplink when I connect the switches.
It can't be the cable, because this cable works with the same SFP module in a DELL server without any problems.
The configuration of the interface is:
ToR1(conf-if-eth1/1/47)# show configuration
!
interface ethernet 1/1/47
description uplink
no shutdown
switchport mode trunk
switchport access vlan 2
switchport trunk allowed vlan 40-41
flowcontrol receive on
flowcontrol transmit off
spanning-tree port type edge
The status of the interface is:
ToR1(conf-if-eth1/1/47)# do show interface ethernet 1/1/47
Ethernet 1/1/47 is up, line protocol is down
Description: uplink
Hardware is Eth, address is 74:86:02:11:22:33
Current address is 74:86:2:11:22:33
Pluggable media present, SFP28 type is SFP28 25GBASE-LR
Wavelength is 1310
Interface index is 60
Internet address is not set
Mode of IPy4 Address Assignment: not set
Interface IPv6 oper status: Disabled
MTU 1532 bytes, IP MTU 1500 bytes
LineSpeed 0, Auto-Negotiation off
Configured FEC is off, Negotiated FeC is off Flowcontrol ry off tx off
ARP type: ARPA, ARP Timeout: 60
Last clearing of "show interface" counters: 00:19:33
Queuing strategy: fifo
Input statistics:
0 packets, 0 octets
0 64-byte pts, 0 over 64-byte pts, 0 over 127-byte pts
0 over 255-byte pts, 0 over 511-byte pts, 0 over 1023-byte pts
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 pts, 0 over 64-byte pkts, 0 over 127-byte pts
0 over 255-byte prts, 0 over 511-byte prts, 0 over 1023-byte pts
0 multicasts, 0 broadcasts, 0 unicasts
0 throttles, 0 discarded, 0 collisions, wred drops
Rate Info(interval 30 seconds):
Input 0 Mbits/sec, 0 packets/sec, o% of line rate
Output 0 Mbits/sec, 0 packets/sec, 0% of line rate
Time since last interface status change: 00:19:34The line protocol is down and I don't know what the connection is missing. Is there anything I need to consider when connecting the two switches?
Thanks for your answers!
-__Felix__-
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October 25th, 2022 11:00
Hello together,
the problem seems to be that DELL and CISCO can't negotiate the forward error correction correctly. I had to manually set the fec to CL108-RS to be able to establish a connection. in addition I set the negotiation to off and the linkspeed to 25000.
With the settings I was able to establish a connection between the DELL S5248F-On and the CISCO Catalyst 9600.
Thanks for your help!
DELL-Young E
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October 13th, 2022 21:00
Hello, thanks for choosing Dell.
What is the current firmware version in switch ?
Is it VLT or standalone setup ?
If your system is in warranty, log analysis would definitely help. You could also try doing loopback test on both Dell and Cisco switch as well. If you call in a remote session could also be possible. Wish you a good one.
-__Felix__-
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October 14th, 2022 04:00
The current firmware version is: 10.5.2.6
It is a VLT setup. Here is a network diagram for better understanding.
The green connection that the red arrow points to is my problem. If I do not connect this connection to the DELL switch on port47, but directly to the R450 server, it works. Therefore I do not assume a cable error. Also the port-group should not be a problem, because the port group 1/1/12, where also the port 1/1/47 is, is set to 25g-4x.
The "show logging log-file" only shows me this message:
And yes, the system is still in warranty. But it should not be a problem to connect these two switches, or are there any manufacturer specific settings that I have to consider?
Best regards
Felix
DELL-Marco B
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3.8K Posts
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October 14th, 2022 09:00
Hello,
no I don't see any issue regarding connecting those two switch, anyway as my collegue said, if the system is under warranty is better to call the support as it is an advanced troubleshooting.
Thanks
fmagic
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March 6th, 2024 21:34
If you are not getting link lights, it's possible the port-group is still using the default 25G setting.
Try running 'show port-group' and verify the setting of the appropriate port group. If necessary, change it to 10G:
conf t
interface port-group1/1/6
mode Eth 10g-4x
This helped us resolve an issue we had uplinking S5224F-ON switches to a Cisco Catalyst 9300 core.