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trunk mode auto

sarahr202
Level 5
Level 5

hi everybody!

i just want to know if two switches sw1 and sw2 are connected as:

sw1---------------------sw2

f0/1 f0/2

will the trunk form if sw1 is configured as:

sw1(config-if)switchport mode dynamic auto

sw2 is configured as:

sw2(config-if)switchport trunk encapsulation dot1q

sw2(config-if)switchport mode trunk

i did not turn off the dtp on sw2.

According to cisco document, trunk will form if the combination is dynamic auto and "trunk" . Is it because dtp is not turned off and sw1 configured with dynamic auto receives the dtp packets and form the trunk? if yes that means if i turn off dtp on sw2 , the trunk should not form ,given that sw1 has dynamic auto configured while sw1 has mode " trunk" ?]

thanks a lot!

1 Reply 1

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello Sarah,

your understanding is correct.

only if the sw2 use the nonegotiate option the trunk will not form on sw1 side

Hope to help

Giuseppe

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