loop Guard /UDLD

I need to verify if this is Correct:
 If L2 link (Trunk) exists between 2 switches. Loopguard /UDLP should be configured on every port on both  switches including on the ports linking the  switches (Trunk ports)

Thank you
jskfanAsked:
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JustInCaseCommented:
Yes, on ports between switches. Typically only one of those, since they are pretty similar.
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jskfanAuthor Commented:
Yes, on ports between switches. Typically only one of those, since they are pretty similar.
On Trunk ports Only  ?
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JustInCaseCommented:
Yes, on trunk ports only since mechanism both enchansments are using is BPDU. If there is no BPDU on port link will be err-disabled (ports to any device that is not sending BPDU will be error disabled (UDLD will err-disable port only if aggressive mode is configured)).
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jskfanAuthor Commented:
Thank you Guys!
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