ICX 7150 connecting to ICX 7850

[kk1313]

Hello, 

I have an ICX 7850 (08.0.95g) as my distributed core. I can connect 7250s just fine, but I cannot link 7150s (08.0.95g). I've tried the connection with both multimode and single mode. The sfp modules match, the speed-duplex matches, the vlan's match. The media is validated on both ports. Any ideas here?

[BenBeck · Accepted solution]

Down at layer 1. Could you try this?

ICX(config-if-e10000-1/2/2)#gig-default neg-off

[kk1313]

That seems to have done the trick! Can you explain why that is?

[BenBeck]

Nice! I believe that fiber port does not have auto-neg capability. That command is basically forcing it to listen to configuration. 

[kk1313]

Ah, well then that would make sense. Thanks so much for the assistance. This worked on my test environment, now I can try it on my production switches.

Out of curiosity: I see in the documentation that "When Gbps negotiation mode is turned off (using the gig-default neg-off command), the device may inadvertently take down both ends
of a link. This is a hardware limitation for which there is currently no workaround."

How likely is this to happen?

[BenBeck]

No problem at all. I think that is a warning if your link is already up this command could bring it down as you are disrupting any prior negotiation. You could also see a flip at initial configuration, but it will come up if configured properly.