I can't remove vlan 1002-1005 from interface?

[GREGORY GEE]

I tried setting the vlan on a trunk port using the following on my 3524XL.

switchport trunk allowed vlan 11

When I look at the config, I see this.

interface GigabitEthernet0/1

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,11,1002-1005

switchport mode trunk

This acts different than my 6509. How do I get rid of the other vlans? I can't seem to remove them. How many other switches act this way? Will this cause any problems?

Thanks,

Greg

[milan.kulik]

Hi,

these VLANs are reserved for Token Ring and FDDI.

See http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/29_35wc6/scg/swvlan.htm for details.

You cant remove them on XL switches.

They can bring some troubles while a trunk is connected to some CatOS switch.

See "CatOS Switch Changes to VTP Transparent Mode, VTP-4-UNSUPPORTEDCFGRCVD:" in http://www.cisco.com/en/US/customer/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml#cat25k and bug CSCdv77448 description.

I'm using

switchport trunk allowed vlan 1,x-y,1002-1005

on my 3500-XL switches (x-y are VLANs I'm using for user data)

and

set trunk mod/port nonegotiate dot1q 1,x-y,1005

on CatOS switch trunks when they're connected to the XLs.

Everything works fine this way, I'm not receiving any error messages, no discrepancies reported via CiscoWorks.

I'm allowing VLAN1 because there were some bugs on Cat3550 and 2950 with VLAN1 disabled on trunk.

Regards,

Milan

[keeran]

this should be marked as solution