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Purple

UDLD

We are going start implementing UDLD on our core switches , is there any potential gottchas other than turning it on globally and then at the port level ? Should we disable it at the port level before enableing it globally and then bring it up one at a time . Also is there any disruption on the ckt. while this is being activated or is completely transparent to the user community .

3 REPLIES

Re: UDLD

There are no gotchas such as port resets as it is a overlay protocol, the only real choice is whether to enable aggress-mode.

Do not use UDLD with the ON - AUTO trunk combination. So make sure that they are auto/des or auto/auto which is recommended by Cisco.

When enabling aggressive UDLD, the recommended message interval is 30 seconds; beware that it might shut down the port on a link where there is an extended period of trunk state mismatch on two sides of the link, especially when the NMP is significantly loaded.

Purple

Re: UDLD

Is there any problem if you are using the on/ on trunk combination ? That's what we are using , way back when we first started using this we had problems trying to use the desirable/desirable combination . I saw the reference you were talking about about the on/auto combination , out of curiosity what problems does that cause if you did use the on/auto combination , it's not really clear reading the material other than it says it's not reccomended .

Re: UDLD

This should not pose a problem at all, i have in the past done some debugging and testing and have never seen a port fall out when enabling UDLD of course unless it is uni-directional

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