Turning off UDLD in a production environment - impact?

[ThomasKlausen]

Greetings.

We have a relatively recent install, based around N9Ks (9504s and 9300s). Our integrator turned on UDLD aggressive as default before handover, and it's causing us issues - ports go into err-disable too often. We want to turn it off, globally. My question is as follows: 

What sort of impact should I expect? 

I am getting conflicting information. Some experts seem to feel that UDLD de facto cares about the link, not the partner. Others insist that we will see link outages. As this is a high-visibility operation and we don't have a lab on hand, I am looking for input on the consequences. Any thoughts, experiences?

[Dennis Mink]

Before you turn it off, try to find out why UDLD puts your link into err-diable mode. because UDLD does what is expected to do:  down a fibre pair if it becomes unidirection. i.e. looses keepalives. If you think that UDLD is somehow flagging a false positive. You could decide to remove it. 

[Reza Sharifi]

Hi,

I recommend doing this in a maintenance window if downtime/outage is import to your organization.

Even if there was no downtime, I would still do it in a window since the environment is highly visible.

Here is a great explanation on UDLD by Peter.

https://supportforums.cisco.com/t5/lan-switching-and-routing/udld-enable-and-udld-aggressive-what-is-the-difference/td-p/724555

HTH