difficulty in creating extended vlans and subinterface

[suthomas1]

Hi,

We have a 3560 switch running IOS universalk9-mz.150-1.SE3.bin.

Recently, we saw two problems with this switch:-

1. if we try to enable subinterface on any routed interface , for eg. gig1/1, it says invalid input detected. It doesnt accept encapsulation command also.

   Following was done to enable subinterface:

   int gig1/1

  no ip address

  int gig1/1.2000

  ip address 1.1.1.1

under the gi1/1.2000 subinterface, it doesnt present the option of ip address.

2. we created a layer 2 vlan 2000 like:

   vlan 2000

when we do an exit after creating this vlan , it gives following error:-

%SW_VLAN-4-VLAN_CREATE_FAIL: Failed to create VLANs 2000: extended VLAN(s) not allowed in current VTP mode

Please help with inputs on what could be wrong. is it the IOS .

Appreciate all inputs!

[mahmoodmkl]

Hi
sub interfaces are not possible on this switch
u are not able to create vlans due the switch is in vtp mode
i suggest to use svi

Sent from Cisco Technical Support iPhone App

[suthomas1]

Mahmood,

Thanks. Is this not possible on the 3560 switch specifically or is it an IOS limitation?

[Raju Sekharan]

Hi

You need to use vtp transparent mode if you would like to use extended VLAN range (

VLAN IDs 1006 to 4094)

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_52_se/configuration/guide/swvlan.html#wpxref78259

Thanks

Raju

[suthomas1]

Raju,

Thanks. So the solution is either to use vtp mode 3 or transparent mode to make this work. please correct me if wrong.

[Raju Sekharan]

yes. If you want to use extended VLAN range, you need to use transparent mode or vtp mode 3

Raju

[suthomas1]

Thanks Raju.  So it means we need to use transparent mode or version 3 to get extended vlans.

1. Currently the core ( 3560 ) is in server mode and access switches are in Client mode with vtp v2.

    If we change the mode to transparent on the 3560, will it affect the connectivity? What changes manually will i have to undertake on core and access switches if it is to be made transparent?

how much downtime is expected?

2. If we change the version to v3 from current v2 , can i still retain the client-server mode and still get the extended vlans feature working?

what is the impact on changing the version from v2 to  v3?

Appreciate all help!

Message was edited by: sunny thomas