Static VLAN, VLAN Trunking, VLAN VTP Modes

Initial switch configuration

Switch(config)#hostname ALS1
ALS1(config)#int vlan 1
ALS1(config-if)#ip add 10.1.1.103 255.255.255.0
ALS1(config-if)#no shut


Switch(config)#hostname ALS2
ALS2(config)#int vlan 1
ALS2(config-if)#ip add 10.1.1.104 255.255.255.0
ALS2(config-if)#no shut

Switch(config)#hostname DLS1

 DLS1(config)#int vlan 1
 DLS1(config-if)#ip add 10.1.1.101 255.255.255.0
 DLS1(config-if)#no shut

Switch(config)#hostname DLS2
DLS2(config)#int vlan 1
DLS2(config-if)#ip add 10.1.1.102 255.255.255.0
DLS2(config-if)#no shut




I will configure DLS1 as a vtp server and ALS1 as a VTP client using vtp domain SWLAB


DLS1#
DLS1#show vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs        : 5
VTP Operating Mode              : Server
VTP Domain Name                 :
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x7D 0x5A 0xA6 0x0E 0x9A 0x72 0xA0 0x3A
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 10.1.1.101 on interface Vl1 (lowest numbered VLAN interface found)
DLS1#config t
Enter configuration commands, one per line.  End with CNTL/Z.
DLS1(config)#vtp domain SWLAB
Changing VTP domain name from NULL to SWLAB
DLS1(config)#do show vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 1005
Number of existing VLANs        : 5
VTP Operating Mode              : Server
VTP Domain Name                 : SWLAB
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x87 0x67 0x56 0x26 0xCB 0xE7 0x65 0x4D
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 10.1.1.101 on interface Vl1 (lowest numbered VLAN interface found)



ALS1#show vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 255
Number of existing VLANs        : 5
VTP Operating Mode              : Server
VTP Domain Name                 :
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x7D 0x5A 0xA6 0x0E 0x9A 0x72 0xA0 0x3A
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 10.1.1.103 on interface Vl1 (lowest numbered VLAN interface found)
ALS1#config t
Enter configuration commands, one per line.  End with CNTL/Z.
ALS1(config)#vtp mode client
Setting device to VTP CLIENT mode.
ALS1(config)#vtp domain SWLAB
Changing VTP domain name from NULL to SWLAB
ALS1(config)#do show vtp status
VTP Version                     : 2
Configuration Revision          : 0
Maximum VLANs supported locally : 255
Number of existing VLANs        : 5
VTP Operating Mode              : Client
VTP Domain Name                 : SWLAB
VTP Pruning Mode                : Disabled
VTP V2 Mode                     : Disabled
VTP Traps Generation            : Disabled
MD5 digest                      : 0x87 0x67 0x56 0x26 0xCB 0xE7 0x65 0x4D
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00

The configuration hasn't been modified because there are no trunks setup between these two switches, if I hadn't given the ALS1 the domain name it wouldn't have gotten it automatically because no trunks exist.




ALS1#show interfaces trunk

ALS1#show interfaces fastEthernet 0/7 switchport
Name: Fa0/7
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Appliance trust: none





DLS1#show interfaces fastEthernet 0/7 switchport 
Name: Fa0/7
Switchport: Enabled
Administrative Mode: dynamic auto
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: On
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: All
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

Trunks will not form because port 7 on both switches are setup for dynamic auto, both are listening for instructions to become a trunk. I will setup DLS1's port 7 in trunk mode for all ports that will be used as trunks.


DLS1(config)#int range fastEthernet 0/7-12
DLS1(config-if-range)#switchport trunk encapsulation dot1q
DLS1(config-if-range)#switchport mode trunk

DLS1#show interfaces trunk
Port        Mode         Encapsulation  Status        Native vlan
Fa0/7       on           802.1q         trunking      1
Fa0/8       on           802.1q         trunking      1
Fa0/9       on           802.1q         trunking      1
Fa0/10      on           802.1q         trunking      1
Fa0/11      on           802.1q         trunking      1
Fa0/12      on           802.1q         trunking      1

ALS1(config)#int range fastEthernet 0/7-12
ALS1(config-if-range)#switchport mode trunk

Client ports will be setup as access switches because they do not need to participate in spanning tree.

DLS2(config)#int range fastEthernet 0/7-12
DLS2(config-if-range)#switchport trunk encapsulation dot1q
DLS2(config-if-range)#switchport mode trunk



ALS2(config)#int fa0/6
ALS2(config-if)#switchport mode access 



DLS1(config)#int fa0/6
DLS1(config-if)#switchport mode access



ALS1(config)#int fa0/6
ALS1(config-if)#switchport mode access


I created the VLANs on the VTP server which will propagate them to clients and other servers within the domain.

DLS1#config t
DLS1(config)#vlan 100
DLS1(config-vlan)#vlan 110
DLS1(config-vlan)#vlan 120


Now I can assign the ports to their respective VLANs.

DLS1(config)#int fa0/6
DLS1(config-if)#switchport access vlan 100

Client can't not speak with each other because they are in different VLANs without layer 3 routing.