Cisco VTP Domain Switch

[Simon Thomas]

I have a 2950 Switch that I configured for the expanded Middle School Library.  I can get the Vlan 100 to work, but I configured a few ports to Vlan 204, which is pushed via the Domain Switch and no go.

I noticed that the configuration has an entry in every interface “no ip address”

What I read in one forum – no problem, just do a no switchport mode command.  That did nothing.

The 2950 switch was set without a VTP Domain.

        I changed it to OURVTPDomai, switch which has a IP of xx.xx.xx.xx

        I check the Domain switch and it is set to Server.

The 2950 – I set the VTP to Client (It was set to Server)

The 2950 – I set the VTP Password to the same as the Domain Switch

The 2950 – I saved the Configuration to Start

The 2950 – I reloaded the Switch

The 2950 – It still is not getting the Vlans etc. from the Domain Switch.

The Domain Switch – Restarted

The 2950 – It still is not getting the Vlans etc. from the Domain Switch.

So I have spent the day reading and nothing is really jumping out. 

Do you have any ideas of what or where I can go to find out why the Domain Server is not sending the Configuration>?

Thank you.

[Reza Sharifi]

You need to configure the ports you want to put in vlan 204 like this

example:

interface GigabitEthernet0/2
switchport mode access

switchport access vlan 204
 spanning-tree portfast

HTH

[Simon Thomas]

Thank you - but I understood that the Domain Switch that had all the vlans configured was to push out the vlans to the Client Switches. 

Here is what I have and yet the "no ip address" line comes up.

interface FastEthernet0/19
description Student-Vlan204
switchport access vlan 204
switchport mode access
no ip address
spanning-tree portfast

[InayathUlla Sharieff]

Simon,

Can you test this:-

default int f0/19

int f0/19

switchport

description Student-Vlan204 

switchport access vlan 204 

switchport mode access 

  spanning-tree portfast

and then you check the port config again and update me?

regards

Inayath

[Masoud Pourshabanian]

VPT packets only travel on trunk ports. Do you have a trunk port between your Domain switch and your new switch?

Use debug to see what is going on.

Command to debug :

Debug sw-vlan vtp {events | packets | pruning [packets | xmit] | xmit}

Terminal monitor (To see debug when you are connecting by telnet).

Masoud

[Simon Thomas]

2950 Goes to 3750 which is connected to the Domain Switch via Fiber  - here is the trunk config.  Which again shoes "no ip address"

interface FastEthernet0/48
description To MSEastSW1
switchport mode trunk
switchport nonegotiate
no ip address
mls qos trust cos
spanning-tree portfast
spanning-tree bpduguard disable
spanning-tree link-type point-to-point

[Masoud Pourshabanian]

VTP does is not rely on IP address. That part of config is correct. Most of the time, it happen when you have domain mismatch. Check the debug command to see what is happening. Be careful  VTP domain name and password are case sensitive.

Check to see your Trunk interface is up and works properly. Pass some traffic on trunk link to make sure it works.

The configuration you sent was from 2950? Make sure both sides have the same trunk protocol. Either dot1q or ISL.

[Simon Thomas]

I will check both switches trunk and report back in.

I did check both the spelling and case on both switches and it is correct.

Thank you.

[Jon Marshall]

I think there is a basic confusion between L2 and L3.

VTP simply passes vlan information to a switch. So if you do a "sh vlan brief" on the 2950 do you see vlan 204 ?

If so VTP has done it's job, it doesn't do anything else.

In terms of the IP addresses on ports all the port configurations you have posted are correct ie. they are L2 whether access or trunk ports so they don't have IP addresses.

Only L3 interfaces whether that be physical interfaces or SVIs ("int vlan <x>") have IP addresses.

Perhaps you could clarify what it is you are trying to do.

Jon

[milan.kulik]

Hi,

if "sh vlan brief" on the 2950 suggested by Jon does not show vlan 204 running, just use

show vtp status

to check if the 2950 is communicating with the VTP server correctly.

The last line of the output should be

Configuration last modified by your_VTP_server at ....

Best regards,

Milan

[Masoud Pourshabanian]

VTP does is not rely on IP address. That part of config is correct. Most of the time, it happen when you have domain mismatch. Check the debug command to see what is happening. Be careful  VTP domain name and password are case sensitive.

Check to see your Trunk interface is up and works properly. Pass some traffic on trunk link to make sure it works.

The configuration you sent was from 2950? Make sure both sides have the same trunk protocol. Either dot1q or ISL.