Network design - Master Tran Van Long, Master Tran Dinh Tung Compiled - 24

2.2. Given the following network model:

Configure Trunk using VTP Password to overcome unwanted VLAN overlapping problem between Switches.

Instruct:

In VTP, if two Switches in the same VTP Domain are connected together, the Switches will exchange VLAN information with each other. If a Switch has a higher Configuration Revision number, it will transfer all its VLAN information to the other Switch. This is sometimes convenient but sometimes not convenient. In the case where a network with many VLANs is already set up and is working well, when upgrading the network by installing a new Switch and we want this Switch to get information about the VLANs that are already in the old Switch, but this Switch has a higher Configuration Revision number, so it has transferred all the VLAN information to the old switch. This means that all the old VLANs that are working will be lost (because the new Switch does not have VLANs yet). VTP Password helps us overcome this unwanted situation. It helps two Switches in the same VTP Domain but with different VTP Passwords not exchange VLAN information with each other via the Trunk.

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- Configure the Switches:

Configure VLAN and Trunk for Switch 1 and Switch 2 similar to exercise 2.1 above.

Network design - Master Tran Van Long, Master Tran Dinh Tung Compiled - 24

Next we configure VTP Password:

Switch 1#vlan database

Switch 1(vlan)#vtp password cisco ←Configure VTP password Switch 1(vlan)#apply

Switch 2#vlan database

Switch 2(vlan)#vtp password cisco1 Switch 2(vlan)#apply

Here, configure two different VTP Passwords. After configuring the VTP Password, we check the Configuration Revision number again, then connect the cable to the two Port fa0/1 and check the VLANs of the two Switches.

Switch 1#sh vtp status

VTP Version : 2 Configuration Revision : 2

Maximum VLANs supported locally : 64 Number of existing VLANs : 8

VTP Operating Mode : Server VTP Domain Name : Switch VTP Pruning Mode : Disabled VTP V2 Mode : Disabled

VTP Traps Generation : Disabled

MD5 digest : 0xDC 0x72 0x0C 0xDF 0x21 0x03 0x77 0xE6 Configuration last modified by 0. 0. 0. 0 at 3-1-93 00 : 21 : 40

Local updater ID is 0. 0. 0. 0 (no valid interface found) Switch 2#sh vtp status

VTP Version : 2 Configuration Revision : 3

Maximum VLANs supported locally : 68 Number of existing VLANs : 8

VTP Operating Mode : Server VTP Domain Name : Switch VTP Pruning Mode : Disabled VTP V2 Mode : Disabled

VTP Traps Generation : Disabled

MD5 digest : 0xEB 0x3F 0x54 0x2C 0x25 0x7B 0x0D 0x19 Configuration last modified by 0. 0. 0. 0 at 3-1-93 00 : 08 : 14

Switch 1#sh vlan

VLAN Name Status Ports

-------------------------------

1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4 Fa0/5, Fa0/6, Fa0/7, Fa0/8

Fa0/9, Fa0/10, Fa0/11, Fa0/12 2 VLAN2 active

4 Vlan4 active

6 Vlan6 active Switch 2#sh vlan

VLAN Name Status Ports

------------------------------

1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4,

Fa0/5, Fa0/6, Fa0/7, Fa0/8, Fa0/9, Fa0/10, Fa0/11, Fa0/12, Fa0/13, Fa0/14, Fa0/15, Fa0/16, Fa0/ 17, Fa0/18, Fa0/19, Fa0/20, Fa0/21, Fa0/22, Fa0/23, Fa0/24

3 Vlan3 active

5 Vlan5 active

7 Vlan7 active

We see that even though Switch 2 has a larger Configuration Revision number, the VLANs of Switch 1 are not deleted. This means that the two Switches do not exchange VLAN information with each other, because Switch 1 has VTP Password cisco and Switch 2 has cisco1.

So if two Switches have the same VTP Domain but different Passwords, they will not transmit VLAN information to each other.

2.3. Configure VLAN for the following network model:

2.4. Configure VLAN routing for the following network model:

2.5. Configure VLAN routing for the following network model:


3. Chapter 4 exercises

3.1. Analyze the following network model:

3.2. Analyze the routing table of the Routers in the following model:

3.3. Draw the network model based on the following routing tables:

3.4. Analyze how to update the routing table in the following network model:

3.5. Configure RIP routing for the following network model:

3.6. Configure RIP routing for the following network model:

3.7. Configure RIP routing for the following network model:

3.8. Configure OSPF routing for the following network model:

3.9. Configure OSPF routing for the following network model:

3.10. Configure EIGRP routing for the following network model:

3.11. Configure EIGRP routing for the following network model:

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