topic Re: 5520 stacking with QSFP+ to SFP+ adapter in ExtremeSwitching (EXOS/Switch Engine)

5520 stacking with QSFP+ to SFP+ adapter

NN_QA — Wed, 06 Mar 2024 08:27:19 GMT

Hi,

I am trying to stack my 5520 series switch, using QSFP+ to SFP+ adapter.But switch is not detecting neighbour device and also tried to use the stack port as a normal ethernet port in that way also it is link is in down state only .Anyone hav any idea?

Re: 5520 stacking with QSFP+ to SFP+ adapter

Stefan_K_ — Wed, 06 Mar 2024 08:52:42 GMT

Hi @NN_QA

Native stacking is only possible using QSFP (40G)
SummitStackV is at least possible using VIM-4X, but most certainly not using QSFP28 Port.
Why not using QSFP Direct Attach cables?
If you want to use them as Ethernet Ports you have to disable stacking-support. Did you do this?

If you already disabled stacking-support to use it as Ethernet Port:

Is the SFP detected? (show ports xx transceiver information detail)
Did you configure the Port speed to 10G? (configure ports xx auto off speed 10000 duplex full)
Anything in the logs? (show log)

Btw, this was already discussed in your other thread. The final conclusion was:

Yes, you can stack 5520 using QSFP28 Ports. The question is, if we can also use these Ports if we use QSFP -> SFP+ Adapters. But I checked the StackingTool again and it says that a VIM-4X is required... So the answer is probably no.

Best regards
Stefan

Re: 5520 stacking with QSFP+ to SFP+ adapter

NN_QA — Wed, 06 Mar 2024 08:58:26 GMT

Hi stefan,

Yes i disabled stacking-support option.SFP got detected but link is not getting up.

Port speed tried to set 10G but getting one error

Error: Auto negotiation is not supported on 10G SFP+ optics in port 25.

can you suggest me which qsfp and direct attach cable can use for stacking(part number of the material).?

Regards,

Nakul

Re: 5520 stacking with QSFP+ to SFP+ adapter

Stefan_K_ — Wed, 06 Mar 2024 09:06:12 GMT

Sounds like you configured it with auto on? Try: configure ports 25 auto off speed 10000 duplex full

Regarding stacking cable: you can use 10311, 10312, 10313 etc.
These are Direct-attach cables. 10311 is 0.5m, 10312 is 1m etc.

You can use https://optics.extremenetworks.com/EXOS/ to check it. Transceivers are also listed there, incl. an information if they support stacking. 10334 could be an option.

Re: 5520 stacking with QSFP+ to SFP+ adapter

NN_QA — Wed, 06 Mar 2024 09:37:14 GMT

Hi stefan,

#showlog
03/06/2024 07:59:07.10 <Erro:HAL.Stacking.Error> KICM LS Thread: SPB 2: Member [0,60]: Unable to read link status, error -18<Invalid port>

03/06/2024 07:59:07.09 <Erro:HAL.Stacking.Error> KICM LS Thread: SPB 1: Member [0,59]: Unable to read link status, error -18<Invalid port>

03/06/2024 07:59:07.09 <Erro:HAL.Stacking.Error> KICM BCM CB: SPB 2: Member [0,60]: Unable to read link status, error -18<Invalid port>

03/06/2024 07:59:07.09 <Erro:HAL.Stacking.Error> KICM BCM CB: SPB 1: Member [0,59]: Unable to read link status, error -18<Invalid port>

#sh ports transceiver information
25 21.14 -2.28 -26.78* 5.74 3.38 N/A

29 31.24 -2.42 -26.78* 8.77 3.34 N/A

#configure ports 25 auto off speed 10000 duplex full
Error: Speed specified is not supported on port 25.

regards,

Re: 5520 stacking with QSFP+ to SFP+ adapter

Stefan_K_ — Wed, 06 Mar 2024 10:01:09 GMT

Are you sure stacking-support is disabled? Did you reboot after executing disable stacking-support?

You can check by using "show stacking-support".

Re: 5520 stacking with QSFP+ to SFP+ adapter

NN_QA — Wed, 06 Mar 2024 14:39:00 GMT

hi,

yes i rebooted