Switchport multi and trunk lines

Oct 27, 2009 2 Replies

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JF Mezei 16 years ago

I have what is now considered an ancient 2924 switch IOS (tm) C2900XL Software (C2900XL-C3H2S-M), Version 12.0(5)WC16, (Enterprise Edition Software).

It will not let me define one port to be

switchport mode multi switchport multi vlan 10,20

with an error message about this not being possible when there is a "trunk" port defined on the switch.

Is this just some silly arbritary restriction on that model or are there protocol/architectural reasons that prevent combination of trunk ports and multi ports on any/all switches ?

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geoar75 16 years ago

Hi,

You can't use multi-VLAN mode when trunk is enabled.

Giorgos

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Doug McIntyre 16 years ago

Multi-VLAN mode was never well supported, and had a bunch of restrictions, one of which is what you see, no multi-vlans if any trunk port exists. I assume they did this for security purposes, although it could have been an internal implementation limitation.

Cisco dropped multi-vlan mode after this switch model was EOL'd, and no other cisco switches since have supported it.

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