configure vlan on cisco 851

You need to create the VLAN in global config ("vlan 30"). Next, assign a port to be a member of the vlan in interface config mode ("switchport access vlan 30"). Then create the VLAN interface and assign an ip address.
 

conf t
vlan 30
int f0
 switchport access vlan 30
 no shut
int VLAN 30
 ip address 192.168.30.1 255.255.255.0
 no shut
end

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Yeah i figured as much, but it doesnt seem to work though. :(

Gw1(config)#vlan 30
Error on initialize VLAN database 1: VTP feature not yet initialized
Gw1(config)#

Gw1(config-if)#switchport?
% Unrecognized command

Can create Vlan30 interface correctly though.
!
interface Vlan30
 description AvayaDect
 ip address 192.168.48.254 255.255.255.0
 ip helper-address 192.168.6.11

Can you post the output of a "show version" please.

Cisco IOS Software, C850 Software (C850-ADVSECURITYK9-M), Version 12.4(15)T1, RE
LEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by Cisco Systems, Inc.
Compiled Wed 18-Jul-07 16:23 by prod_rel_team

ROM: System Bootstrap, Version 12.3(8r)YI4, RELEASE SOFTWARE

OutrupGw1 uptime is 12 weeks, 5 days, 2 hours, 45 minutes
System returned to ROM by reload at 14:19:33 CEST Thu Aug 14 2008
System restarted at 14:20:03 CEST Thu Aug 14 2008
System image file is "flash:c850-advsecurityk9-mz.124-15.T1.bin"


This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Cisco 851 (MPC8272) processor (revision 0x200) with 49152K/16384K bytes of memor
y.
Processor board ID FCZ112623HW
MPC8272 CPU Rev: Part Number 0xC, Mask Number 0x10
5 FastEthernet interfaces
128K bytes of non-volatile configuration memory.
20480K bytes of processor board System flash (Intel Strataflash)

Configuration register is 0x2102

Two questions/suggestions;

1) Can you try to put the switch/router in VTP transparent mode and see if that resolves the "VTP feature not yet initialized" message.

2) Which interface are you trying the "switchport" command on? If I remember correctly, It's only available on the first 4 interfaces (f0 - 3).

transparent; done.

After;
Gw1(config)#vla 30
Vlan can not be added. Maximum number of 1 vlan(s) in the database.

Tried to apply switchport to interfaces f0, f1 and f3. No go.

Now we're getting somewhere. You're only allowed one VLAN. Probably an IOS limitation. There are also a ton of software advisories on that image. I'd upgrade the IOS. "T" versions are always full of surprises.

If I go to the software advisor, im oly allowed to downpload the Advsecurity feature set.  Is it a software limitation on this feature set? Because then im stuck.

Thanks for that!