Trunk Problem

momobhai · ‎07-16-2022

Hi, I'm a beginner using cisco switch for VLANs.

I've configured a switch with 4 VLANs for data/AP/CCTV/IP phone

VLAN 2,3,4,5

when I pull out and reinsert network cables, these ports configured for IP phones turn from access GEs to the trunk

how can I prevent this?

thanks

marce1000 · ‎07-17-2022

- Disable the Auto Smartport feature on the involved ports : https://content.cisco.com/chapter.sjs?uri=/searchable/chapter/content/en/us/td/docs/switches/lan/catalyst9200/software/release/16-12/configuration_guide/int_hw/b_1612_int_and_hw_9200_cg/configuring_auto_smartports.html.xml#:~:text=To%20disable%20Auto....

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

balaji.bandi · ‎07-17-2022

what model of the switch here? is they are the SG series.

If you do not know how to use smart port usage, then as suggested go to the traditional way by disabling the smart port good move.

BB

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Jitendra Kumar · ‎07-17-2022

Disable the DTP on the port,s if getting an issue and disable the auto-negotiation if required..

for checking DTP below is the command

#show dtp interface gigabitEthernet 0/0

Thanks,
Jitendra