VTP Transparent mode doubt

[pfr 1]

Hi Team,

 

INE Mock lab 16

 

1.1 Pruning

• Some time ago a new switch was installed in your network that had a high

configuration revision number and it erroneously overwrote your entire

VTP domain.

• In order to protect against this type of misconfiguration in the future your

new corporate policy dictates that all switches must run in VTP

transparent mode. However since SW1, SW2, SW3, and SW4 are not

advertising VLAN information to each other they cannot participate in VTP

pruning. This has resulted in a large amount of unnecessary broadcast

traffic being sent over your trunk links.

• In order to solve this problem manually configure your network to behave

as though VTP pruning has been enabled.

• Trunk only the necessary VLANs on SW2’s trunk to R6.

 

The solution is below

SW1, SW2:

vtp mode transparent

SW1:

interface FastEthernet0/14

switchport trunk allowed vlan 16,47,100,200

!

interface FastEthernet0/19

switchport trunk allowed vlan 3003

SW2:

interface FastEthernet0/14

switchport trunk allowed vlan 16,63

!

interface FastEthernet0/14

switchport trunk allowed vlan 16,47,100,200

!

interface FastEthernet0/16

switchport trunk allowed vlan 63

SW3:

interface FastEthernet0/16

switchport trunk allowed vlan 63

SW4:

interface FastEthernet0/13

switchport trunk allowed vlan 3003

 

 

Why do we need 3003 on Sw1 and SW4 ?

 

INE mock lab 9 1.4 also is similar. Solution says VLAN 68 connects SW2 to R6 (connected to SW4), so needs to be created on SW2, SW3, and SW4. Why ?

 

I couldn't find the logic behind the solution. Could someone help ?

 

Thanks

Edited October 20, 2010 by pfr

[i3isking 0]

I have checked the solution it doesn't have any 3003 vlan. Maybe they had a mistake in solution and fixed it in a later revision.

[pfr 1]

Hi i3isking,

Thanks for your reply.

 

Could we have couple of more responses to the question

 

Thanks

[Peterjj 1]

You use VTP pruning of stop the vlan flooding traffic into the switching domain. If you want to mimic pruning in transparent mode, you need stop the vlan spanning unnecessary switches. So only allow required vlans on the trunks.

[pfr 1]

You use VTP pruning of stop the vlan flooding traffic into the switching domain. If you want to mimic pruning in transparent mode, you need stop the vlan spanning unnecessary switches. So only allow required vlans on the trunks.

 

Hi Peterjj,

 

Thanks for your response.

But I was looking for feedback on the exact question of INE. I couldn't get their answer. I wanted to know if I their answer is right or wrong

 

This is a very important topic always asked in the CCIE lab and we have to be 100% sure about the concept.

If you have INE could you check that question ?

 

 

Thanks