I just noticed one thing and I am sharing to all of you
Dynamic Trunking Protocol (DTP) sends the VTP domain name in a DTP packet.
Therefore, if you have two ends of a link that belong to different VTP domains,
the trunk does not come up if you use DTP. In this special case, you must
configure the trunk mode as on or nonegotiate, on both sides, in order to allow
the trunk to come up without DTP negotiation agreement.
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Windows Live™: Keep your life in sync.
http://windowslive.com/explore?ocid=TXT_TAGLM_WL_BR_life_in_synch_062009
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