VTP mismatch

[Andy White]

Hello,

I have enabled syslog on a lot of switches today and cleared down all the errors apart from this one below:

VTP protocol user notification: Version 1 device detected on Gi1/0/7 after grace period has ended

Most of the issues today that I have cleared are VTP issues or duplex issues which are now resolved.  I thought the above issues woudl be easy to fix but it isn't.  I have checked the VTP version and it is version 2 on both switches and the Domain and password are correct.  I even removed the VTP info and re-added it all and I still get the above error, any ideas?

Thanks

[Ivan Shirshin]

Hi Andy,

Could you provide "show vtp status" from both this device and the device connected on port gig1/0/7?

Kind Regards,
Ivan

**Please grade this post if you find it useful.

[Andy White]

Sure:

This is the device off gig1/0/7

VTP Version                     : 2

Configuration Revision          : 3

Maximum VLANs supported locally : 250

Number of existing VLANs        : 6

VTP Operating Mode              : Server

VTP Domain Name                 : Holt

VTP Pruning Mode                : Disabled

VTP V2 Mode                     : Enabled

VTP Traps Generation            : Enabled

MD5 digest                      : 0x5A 0xB9 0x0C 0xE9 0xA2 0x96 0x2B 0x49

Configuration last modified by 0.0.0.0 at 3-1-93 00:06:42

Local updater ID is 10.1.60.34 on interface Vl10 (lowest numbered VLAN interface found)

Here is the other:

VTP Version capable             : 1 to 3
VTP version running             : 2
VTP Domain Name                 : Holt
VTP Pruning Mode                : Disabled
VTP Traps Generation            : Enabled
Device ID                       : 0019.e743.0c00
Configuration last modified by 0.0.0.0 at 3-1-93 00:06:42
Local updater ID is 10.1.60.11 on interface Vl10 (lowest numbered VLAN interface found)

Feature VLAN:
--------------
VTP Operating Mode                : Server
Maximum VLANs supported locally   : 1005
Number of existing VLANs          : 6
Configuration Revision            : 3
MD5 digest                        : 0x5A 0xB9 0x0C 0xE9 0xA2 0x96 0x2B 0x49
                                    0x3A 0xD3 0xE4 0xF1 0xBA 0xB0 0xFB 0x99

Thanks

[Ivan Shirshin]

Hi Andy,

Is the one of devices actually a switch stack? If so, please send the output of "rem com all show vtp status".

Also, I see both are VTP servers. Is that intended?

Try to configure the following commands on switches:

switch#vlan database

switch(vlan)#vtp v2-mode

switch(vlan)#exit

Kind Regards,
Ivan

**Please grade this post if you find it useful.

[rizwanr74]

Hi Andy

Please force an update on your primary switch by creating a dummy layer2 vlan and then deleting it.

It should fix up your problem.

Please let me know, if this helps.

thanks

Rizwan Rafeek

[Andy White]

Hi all,

Sorry for the delay.  I'm not sure why the other switch is server too and not client, but it seems they have set all their switches to server. 

How can I force an update by creating a dummy layer 2 vlan?  Will their be downtime?

To eaxplain things better one switch is a 3750 and has 6 2955 switchs trunking to it and 5 of them are fine it is just one 2955 complaining about the VTP, so I guess it is just that switch that is the problem?

Tanks

[dolahadad]

is it the switch still working as it suppose to be?

or that 1 switch really cause a network distruption?

If I were you, I will ignore the warning if it doesn't have impact on my network.

Also,

I notice on the troubled switch :

The Maximum VLANs supported locally : 250

have you check the IOS version?

maybe that switch have the lower IOS version then the others..

Regards,

Dola.

[Ivan Shirshin]

Hi Andy,

About triggering updates:

When you delete a VLAN from a switch that is in  VTP server mode, the VLAN is removed from the VLAN database for all  switches in the VTP domain. Since problem switch is a server like the rest of switches, creating any new vlan and then removing it will generate VTP updates for all switches. See the following guide for managing VLANs on 2950:

http://www.cisco.com/en/US/docs/switches/lan/catalyst2950/software/release/12.1_22ea/SCG/swvlan.html#wp1150876

Kind Regards,

Ivan

**Please grade this post if you find it useful.

[Andy White]

Hi, guys, so how do I force an update?

The 3750 is running the latest IOS (as of a round a month ago) and teh 2955's are all running the same IOS and is also the latest for that model.

Thanks

[Ivan Shirshin]

Hi Andy,

Please see my reply in a message above.

Kind Regards,
Ivan

[Andy White]

Thanks, sorry I don't know why I didn't see that!

Thing is if I start deleting VLAN's I will lose connectivity, I am not accessing these switches via a rollover cable.

[Ivan Shirshin]

No worries!

As for the deleting VLAN  - that is why it was recommended to first add dummy vlan, so that deleting it (dummy one) would not have any effect on connectivity.

Kind Regards,
Ivan

**Please grade this post if you find it useful.