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trunking

One of my coworkers just came back from networkers and on one of his sessions the Cisco instructors said, when trunking Cisco recommends mode to be “ON ON” or “DESIRABLE DESIRABLE” on both sides. If this is accurate can someone explain why?

Thanks

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Cisco Employee

Re: trunking

Cisco recommends an explicit trunk configuration of desirable at both ends. In this mode, network operators can trust syslog and command line status messages that a port is up and trunking, unlike on mode, which can make a port appear up even though the neighbor is misconfigured. In addition, desirable mode trunk provides stability in situations where one side of the link cannot become a trunk or drops trunk state.

http://www.cisco.com/warp/public/473/103.html

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