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Beginner

Troubles related to vlan trunking mismatch

Hello guys,

     Somebody knows what kind of problems can be arise when you have vlan mismatch between two switches that have configured diferent trunk native vlan between these switches , slow trafic on the network?... lost of packets?.. Thanks a lots guys

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Hall of Fame Guru

Re: Troubles related to vlan trunking mismatch

You can definitely get packet loss because if you are running a version of PVST+ STP will block one of the vlans on the trunk link in order to avoid a possible loop.

Basically with a different native vlan on either end you have joined two vlans together. So STP reports a PVID inconsistency and will block for one of those vlans.

Jon

Beginner

Re: Troubles related to vlan trunking mismatch

We have a network that is experiencing slow speed on their network, this network is a start topology, and they have vlans mismatchs... there is no redundancy... switches can block ports despite there is no duble links between switches?....

Hall of Fame Guru

Troubles related to vlan trunking mismatch

switches can block ports despite there is no duble links between switches?....

yes because it is done a per trunk link basis. STP doesn't block the whole trunk link only the native vlan on that trunk link providing you are running a per vlan STP.

That said you would probably be seeing loss of connectivity rather than slow speed as if STP did block the vlan no packets would pass.

Jon

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