vlan configuration

[ramonat]

i've added a new switch to our network, have it config with uplink connection. will the vlan config from the core propogate down or is that a manual process to set that up?

[Mohamad Qayoom]

It should propogate down as long as they are in the same VTP domain, the mode is correct, and your uplink is configured as a trunk port.

[ramonat]

not sure if i have my uplink config correct but this is what i have: there is no vtp domain on the core,

switchport trunk encapsulation dot1q

switchport mode trunk

is that it?

[Mohamad Qayoom]

The port configurations look ok.

The core should be a VTP server and the other one should be a VTP client. And they both should be in same VTP domain.

[ramonat]

if i go in and set a vtp domain on the core will that cause any problems? i have another stand alone switch that was setup prior to me taking this on and it has all the vlans settings but this was all without a vtp domain setting. is this the only way this can happen?

[Tshi M]

please check the VTP status of both switches. If you want to make any changes, I would recommend to make the changes during off hours. In a small environment, you can get away with one switch as a server and the other as clients. Though Cisco recommends transparent mode to avoid some obvious problems.

regards,

[Tshi M]

here are some helpful links. At least I hope they are:

http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080094c52.shtml

http://www.cisco.com/en/US/tech/tk389/tk689/technologies_configuration_example09186a0080890607.shtml

[ramonat]

definitely helpful with understanding the settings of vtp.thanks!

[Giuseppe Larosa]

Hello Ramon,

use

sh vtp status

on all three switches to check the current status of VTP

they need to match on the following:

vtp domain name

vtp revision number

ip address and date/time of last update

also the MD5 string has to be the same.

if you like you can post here to get help.

Hope to help

Giuseppe

[ramonat]

i have a 5 stack switch setup running in vtp server mode. is it because its running in stack config that the vlans are able to propogate without a vtp domain and now that i am trying to setup a new switch outside of the stack now i need a vtp domain in order to propogate the vlans down.

[Tshi M]

what do you get with the command

sh vtp status

[ramonat]

vtp version 2

vtp operating mode server

vtp domain

vtp pruning disabled

vtp v2 mode disabled

vtp trap gen disabled

md5 digest #0x84 0x52 0xB2 0xF0 0x4A 0xA6 0xCD 0x17

[Tshi M · Accepted solution]

you need to setup a vtp domain. Please refer to the second link i sent you earlier.

I will advise to make any changes after working hours just to be in the safe side.

you can either use:

switch(config)#vtp domain (your_domain_name)

or use the old

switch#vlan database

switch(vlan)# vtp domain (your_domain_name)

regards,

[ramonat]

yes i see from the article and other input that the vtp domain is what's missing and i guess this never came up since the other switches are part of the stack so vtp domain was not needed. thanks for the help.

[Mohamad Qayoom]

The VLANs are propogated in your 5 stack switch without a VTP domain because the stack is considered as one big switch. For example, if you have a 4506, you don't have VTP information for every blade. And yes, if you are configuring a new switch that is not part of the existing stack, you need a VTP domain.