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==External links==
* [http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a008009477b.shtml Understanding and Configuring the Unidirectional Link Detection Protocol Feature] at [[Cisco Systems]]
* {{cite web |url=https://www.iol.unh.edu/services/testing/10gec/
[[Category:Link protocols]]
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