Re: Transparent mode to server mode

horvaia · ‎06-24-2005

Hi,

I have a network with 3 switches. I'm using vlans and I have problem with out WS-C2950-24 type switch.

I'm not able to put the switch's vtp status in server mode. What could be the problem? The other two

switches are in server mode. Thanks for your help,

Andras

sh vtp status

VTP Version : 2

Configuration Revision : 0

Maximum VLANs supported locally : 64

Number of existing VLANs : 63

VTP Operating Mode : Transparent

VTP Domain Name : Company_VLAN

VTP Pruning Mode : Disabled

VTP V2 Mode : Disabled

VTP Traps Generation : Disabled

MD5 digest : 0x9F 0xAF 0x67 0xDA 0x78 0x92 0xA9 0x57

Configuration last modified by 213.134.0.243 at 6-21-05 15:38:55

sh ver

Cisco Internetwork Operating System Software

IOS (tm) C2950 Software (C2950-I6Q4L2-M), Version 12.1(13)EA1c, RELEASE SOFTWARE (fc1)

Compiled Tue 24-Jun-03 17:31 by yenanh

Image text-base: 0x80010000, data-base: 0x805A8000

ROM: Bootstrap program is CALHOUN boot loader

serverswitch2 uptime is 29 weeks, 2 days, 5 hours, 4 minutes

System returned to ROM by power-on

System restarted at 09:58:25 CEST Wed Dec 1 2004

System image file is "flash:c2950-i6q4l2-mz.121-13.EA1c.bin"

cisco WS-C2950-24 (RC32300) processor (revision B0) with 20839K bytes of memory.

Processor board ID FAB0602Y358

Last reset from system-reset

Running Standard Image

24 FastEthernet/IEEE 802.3 interface(s)

peterledwidge · ‎06-24-2005

Are you using extended VLANs?

If extended-range VLANs are configured on the switch, you cannot change VTP mode to server. You receive an error message, and the configuration is not allowed.

http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_guide_chapter09186a00800d84bf.html#24519

HTH

peterledwidge · ‎06-24-2005

Have you tried ?

config t

no vtp mode

The default operation is server mode.

horvaia · ‎06-29-2005

Hi,

(sorry for the delay)

I don't use extended-range VLANs. Look: (the last few):

535 enet 100535 1500 - - - - - 0 0

539 enet 100539 1500 - - - - - 0 0

560 enet 100560 1500 - - - - - 0 0

561 enet 100561 1500 - - - - - 0 0

562 enet 100562 1500 - - - - - 0 0

564 enet 100564 1500 - - - - - 0 0

700 enet 100700 1500 - - - - - 0 0

998 enet 100998 1500 - - - - - 0 0

999 enet 100999 1500 - - - - - 0 0

1002 fddi 101002 1500 - - - - - 1 1003

1003 tr 101003 1500 1005 3276 - - srb 1 1002

1004 fdnet 101004 1500 - - 1 ibm - 0 0

1005 trnet 101005 1500 - - 15 ibm - 0 0

glen.grant · ‎06-24-2005

What are your other 2 switches that are servers ? If they are bigger switches that support 1000 vlans then your problem is you did not prune off any uneeded vlans off the trunks . The 2950 can only handle 64 vlans I believe so if a server is trying to send information for more than that it will default to transparent mode , I would think there would be something in the 2950 logs indicating this but I could be wrong . Manually prune unneeded vlans off the link that goes to this 2950 . Also if you are running 3 switches you should make 1 or 2 servers and the other switch I would make a client .

horvaia · ‎06-29-2005

My two other switches are:

WS-C2924-XL-EN(max:64) and WS-C3548-XL-EN (max:250).

You are right this is in the log:

%PM-2-VLAN_ADD: Failed to add VLAN 444 - exceeded system VLAN limit

when i try to change from transparent to server:

%SW_VLAN-6-VTP_MODE_CHANGE: VLAN manager changing device mode from SERVER to TRANSPARENT.

amit-singh · ‎06-25-2005

I do agree with Glen's post. this is the issue with the number of Vlans that 2950 can handle. Its supports only 64 Vlans and in case if gets more than that via VTP it changes itself to transparent mode.

Mmanually prune off the Vlans from the trunk or delete the unwanted Vlans from the server and it will take care of the issue.

regards,

-amit singh

Prashanth Krishnappa · ‎06-25-2005

Why do you think clearing trunks on the trunk take care of the VTP mode changing to transparenet issue?

Number of VLANs in a VTP domain is advertised in a VTP update packet and just clearing off VLANs will not change the number. However, clearing off VLANs on the trunk will help in running STP for the VLANs needed.

amit-singh · ‎06-29-2005

Yup,

Got your point Prashanth, taking the Vlan off from the trunk will not help in this issue. I think the only thing is to remove the unwanted vlans from the server.

thanks for the reply.

-amit singh

horvaia · ‎06-29-2005

Thanks guys,

I will delete manually my unwanted vlans.

Andras