Skip to main content
Share Your Experience: Take the 2024 Developer Survey
5 votes
Accepted

VTP does not update VLANs in switch

For VTP to work between a VTP server and client, the VTP Domain Name and VTP passwords must match. You have the same VTP Domain Name (ccna), but the VTP Passwords do not match. You can tell that the ...
Ron Maupin's user avatar
  • 99.8k
4 votes

VTP and VTP domain

If you have not previously configured a switch to be in a VTP domain, it will become part of the VTP domain from the first VTP advertisement it sees. See the sections which I emphasized below: ...
Ron Maupin's user avatar
  • 99.8k
3 votes

DHCP server access problem

Neither. DHCP works by the server receiving the client's broadcast - so you need a working broadcast domain (aka L2 segment aka VLAN) in between, unless you're using a DHCP relay. As long as the ...
Zac67's user avatar
  • 84.9k
3 votes

How does VTP deal with revision conflict

If a switch gets revision X+1 from one VTP server, it will simply look at the revision number if that same revision number comes in an update from the other VTP server. The switch will then ignore the ...
Ron Maupin's user avatar
  • 99.8k
3 votes

what is the relation between DTP and VTP?

This question is very similar to this other question: Whats the difference between VTP and DTP You do not actually need VTP at all to use DTP but if you want VTP to work and you want DTP to work then ...
FrameHowitzer's user avatar
3 votes
Accepted

VTP VLAN configuration not allowed when device is not the primary server for vlan database

I got it. I rebooted the switch but the Primary Server role is not reboot-persistent, which means it may be lost if the switch reloads and another one taking over the Primary Server role. You can make ...
MBrain's user avatar
  • 79
3 votes
Accepted

How does the VTP Client update it's information if the revision number is equal?

If the rev number is identical, the client assumes it's already got the latest config and there's no update. You'll need to reset the client to make it update.
Zac67's user avatar
  • 84.9k
3 votes

VTP updates through router!

VTP is a layer 2 protocol and therefore can't be forwarded over a layer 3 boundary. Also, since Vlans terminate at a layer 3 boundary, why would you want to?
Ron Trunk's user avatar
  • 67.7k
3 votes
Accepted

Inter-VLAN Routing with VTP Server and Clients in Packet Tracer

It seems you have the SVI for VLANs 10, 20, and 30 configured on all three switches. This is going to cause an IP conflict. The only switch that actually needs the SVI is whatever switch that will be ...
Eddie's user avatar
  • 15k
2 votes

VTP transparent mode Switch does not pass user traffic to and from other VTP Switches

This has nothing to do with VTP. If Switch C only has VLAN 1, it's not going to forward other tagged traffic from one port to another.
Ron Trunk's user avatar
  • 67.7k
2 votes
Accepted

Sharing VTP Info Between two VTP Servers

OK. You have a couple of problems. First, you need to make sure that the channel is a trunk. VTP only works on trunks. On both switches: interface Port-channel1 switchport mode trunk ! Next, you ...
Ron Maupin's user avatar
  • 99.8k
2 votes
Accepted

What is the impact of VTP pruning against RSTP topology?

After days of trials and researches, I managed to get a clear answer that I want to share here also. VTP pruning does NOT reduce the number of STP instances running on each switch; it just removes ...
mouch's user avatar
  • 170
2 votes
Accepted

VTP not working in all switches

Apparently, your VTP password is incorrect on the 2960X which doesn't work. The MD5 digest on VTP doesn't match on the last (non-working) of the three switches you show. You wrote there is no MD5 ...
Ron Maupin's user avatar
  • 99.8k
1 vote
Accepted

How does VTP deal with revision conflict

How is that solved? Probably not really at all. https://www.cisco.com/c/en/us/support/docs/lan-switching/vtp/98155-tshoot-vlan.html#topic14 (quoted from above, emphasis by me) VTP is designed ...
Marc 'netztier' Luethi's user avatar
1 vote

How can I force VTP clients to update their VLAN database from the VTP server, on Cisco devices?

While most people get the vtp config setup they sometimes forget to trunk the interface. When all your vtp stuff looks right (but config rev not incrementing/updating) then it's probably a trunking ...
Jeff Baker's user avatar
1 vote
Accepted

switch joining vtp domain fails with unknown error

Ok, got the cause cornered, I think. It looks like an IOS version problem: making the 2811 vtp server and any switch vtp client works as expected. The other way round never works. Conclusion: vtp ...
JdeHaan's user avatar
  • 103
1 vote
Accepted

VTP Mode Automatically Changing to Server

It sounds like someone removed the domain name and password on the switches in question. This leaves them with no VTP set, just like a new switch, which will auto-configure VTP from VTP advertisements ...
Ron Maupin's user avatar
  • 99.8k
1 vote

Can't establish the connection for switch

Your problem is that the VTP passwords don't match. On the non-working switch: MD5 digest : 0xB9 0x07 0xEE 0xE3 0x27 0xEC 0xF7 0x33 0x98 ...
Ron Maupin's user avatar
  • 99.8k

Only top scored, non community-wiki answers of a minimum length are eligible