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.


Thanks


Gilles

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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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Gilles


From Cisco best practices doc for 4500/6500 IOS


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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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Full link:


http://www.cisco.com/en/US/products/hw/switches/ps700/products_white_paper09186a00801b49a4.shtml


Jon

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