VTP- Level 2 question and answers

vpp feature

How many Switches can act in Server mode, for a single VTP domain?
Can we have more than one VTP server in the environment? Should we configure
them as Primary or Secondary?
Till VTP version 2
We can have multiple switches acting in Server mode
There is no logic of Primary and Secondary.
Both the Switches will have equal rights.
We can do Vlan modification on any of the Switch acting in Server mode.
But in VTP version 3,
We can make one switch as Primary and another as secondary

 

What is difference between VTP server, client & transparent mode?

Server Mode
-In this mode, we can create, modify & delete vlans
-Changes made on the server mode gets replicated onto the other switches
-When changes are made, Revision number gets incremented. When new
revision number is received via VTP traffic, other switches come to know
about the new update of Vlans
-Higher revision number always takes precedence. To keep it simple, higher
revision number means latest Vlan configuration
-We can specify other configurations like VTP version, VTP pruning for entire

VTP domain
-VTP advertisements travel within the same VTP domain only
-There can be more than one VTP server in the network, they will not act as
Primary & Secondary. Both will have equal rights
-By default, new switch is in Server mode

Client Mode
-When client gets update, switch will update itself & passes update further
-We cannot do vlan related changes on client mode, switch will give error
message
-New switch should be added as Client mode with Revision number equal to
zero

Transparent Mode
-When Transparent gets update, switch will not update itself & passes update
further (simply act as Transparent)
-Changes performed on the Transparent will not be replicated to other
switches

Off Mode
-When switch in Off mode gets update, switch will not update itself and do not
pass further
-It is similar to VTP transparent mode, except that switch will not pass update
further

 

What is the difference between different VTP versions, ver 1, ver 2 & ver 3?
Different VTP versions are compatible with each other or not?

vtp1-3

D1 & D2 are two VTP domains
Case 1 : Server (D1, ver1) —- (D2, ver1) Client
Case 2 : Server (D1, ver1) —- (D1, ver2) Client
Are they going to exchange VTP updates?

In Case 1, Server and Client have different VTP domain, so they will not exchange
VTP updates, so logic of version has nothing to do in this scenario
In Case 2, Server and Client have same VTP domain, so they will exchange VTP
updates based on version 1

How they will work in below scenario?
Case 1 : Server (ver1) —- (ver2) Client
Case 2 : Server (ver2) —- (ver1) Client
Case 1,
Initially, Both server and client was running with version 2
We downgraded the Server to version 1
It is observed that Client also got downgraded to ver 1
case1

Case 2,
Initially, Both server and client was running with versio
Now, we upgraded the Server to version 2
It is observed that Client also got upgraded to ver 2

case2

How much is the Revision number increased in Case 1 & 2?
Case 1: switch(config)#vlan 10
switch(config)#vlan 20
Case 2: switch(config)#vlan 10-20

How much is the Revision number increased in Case 1 & 2?
Case 1: switch(config)#vlan 10
switch(config)#vlan 20
Case 2: switch(config)#vlan 10-20

In Case 1, Revision number will be increased by value 2
In Case 2, Revision number will be increased by value 1

 

Who will over write another one? Who will win? server or client ?
Connectivity: server (Rev. x) ——- client (Rev. x+1)
Client will win over Server here
Thumb Rule, Revision number always takes precedence
That’s why it is always recommended to add new switch in network with Revision
number equal to zero, so that it will not impact the current Vlan configuration

 

Select correct statement
Client mode update itself and pass on update further
Client mode do not update itself and pass on update further
Client mode update itself and do not pass on further
Client mode update itself and pass on update further

 

Select correct statement
Transparent mode update itself & pass on update further
Transparent mode do not update itself & pass on update further
Transparent mode update itself & do not pass on further
Transparent mode do not update itself & pass on update further

 

If we have two VTP server, do they act as Primary & Secondary?
If no, how they will act? If yes, How to elect primary & secondary?
It depends on the VTP version
In version 1 & 2, we cannot make Primary and secondary
In version 3, we can have primary and secondary

 

What is the recommendation? To have One VTP server or Two VTP server?
Recommendation is to have more than VTP server, Reason is simple that is
redundancy

 

How to make Revision number? Suggest two options?

Option 1
-VTP Domain name should be changed to any bogus name (which do not
exist)
-Then back to the original VTP domain name
Option 2
-VTP mode should be change to the transparent mode
-Then back to the required VTP mode (Let’s say client mode)

VTP traffic travels on which vlan? VTP traffic is tagged or untagged?
VTP traffic travels over Vlan 1
Other critical traffic like CDP also travels over Vlan 1. We cannot shut down Vlan 1.

 

In which mode, new switch should be added to the network?
Client or Server or Transparent? What is the recommendation?
New switch should be added in Client Mode, but with Revision number zero
By this, Switch will update itself and pass on the updates to other switches further