dtp causes unnecessary traffic... when you manually configure a trunk on both sides, as you should, you will still get dtp traffic... port 1 says, i'm a trunk; port 2 says i'm a trunk too back to port 1, and port 1 says it's delightful to be a trunk and port 2 says, being a trunk is good...
turn that shit off...
never trust your trunks to create themselves...
dls1(config)#int f0/15
dls1(config-if)#sw
dls1(config-if)#sw trunk encap dot1q
dls1(config-if)#sw mode trunk
dls1(config-if)#sw nonegotiate
dls1(config-if)#end
dls1#sh int f0/15 trunk
Port Mode Encapsulation Status Native vlan
Fa0/15 on 802.1q other 1
use nonegotiate to stop the stupid dtp traffic...
dynamic auto on both sides leads to a dtp roadblock... this is because auto is a passive state... two passive's will never make an active... similar in fashion to pagp and lacp...
network cisco ccna gns3 certification arteq
a network runs through it
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