Native VLAN help

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May 3rd, 2009
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Just a couple of questions regarding a 24 port 3750G I have, I don't think VLAN 1 i the native vlan, how can I tell which VLAN is the native as vlan 1 is shutdown?

Also it has 24 ports but if I run the below command I only see 9:

sh interfaces gigabitEthernet ?

<1-9> GigabitEthernet interface number

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Giuseppe Larosa Sun, 05/03/2009 - 23:49
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Hello Andy,

first of all the native vlan is an OSI layer 2 concept:

the interface that you see shut down is the L3 interface that can be associated to broadcast domain Vlan1 (it is an SVI switched virtual interface).

vlan1 should still the native vlan even if SVI vlan1 is shut.

to verify what are the native vlan settings you can use:

sh int type x/y switchport

look for the native vlan line

about interfaces:

sh int ?

see if the other interfaces are fastethernet

Hope to help



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