MLT between VOSS devices

[ITDept19]

I am after guidance on setting up an MLT between 2 VOSS devices, a Core Switch and a 5420.

Diagram of set up is:

The link between Cores and CabA is multi mode fibre and there’s an Extreme Networks LX GBICs on the uplink ports (1/20 and 1/50).

SPBM is not configured on the Core Switch.

The link between Core2 and CabA-Sw2 has not been connected yet.

The link on CoreA comes up, and stays up, I can see this from running “sh int gig state 1/20”.

The link on the 5420 doesn’t, however there is also nothing in logging file to indicate why.

I’ve confirmed the GBIC is visible on the 5420 with sh plug basic, and I also get a logging message when it’s plugged into port 1/50.

Anything I am missing or doing wrong?

[ITDept19]

We only have LX gbics.

We have used LX gbics with multi mode on ERS switches without issues.

The gbic we are using is a 1Gb LX gbic, rather than a 10Gb gbic. I think this may be the issue. I came across https://extremeportal.force.com/ExtrArticleDetail?an=000107496&q=5420 and tried what was suggested without luck.

[Jave]

So you have tried with LR modules without success ?

[ITDept19]

Yep, I've only got LX modules to test with.
Changing the interfaces to "no auto-negotiate" made no difference.

Unfortunately, I don't have a LC-LC single mode duplex cable to test directly between core and 5420 switch, bypassing the multimode cable run.