Trunking recommendation

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May 13th, 2008
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I would like to know what Cisco recommends regarding trunking configuration..

Should I use the command switchport mode trunk or let the ports negotiate between them.

Could you explain the difference.



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bvsnarayana03 Tue, 05/13/2008 - 04:31
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Some people prefer to have trunking on by manual methods & some people who'll leave it to negotiate.

you may want to leave the ports in desirable state to let the trunk negotiate.

Jon Marshall Tue, 05/13/2008 - 04:34
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From Cisco best practices doc for 4500/6500 IOS


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


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