The key benefits for running VTP Version 3 on a Cisco switch environment are:
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#hostname SW01
SW01(config)#vtp version ?
<1-3> Set the administrative domain VTP version number
SW01config)#vtp version 3 // NEED TO CONFIGURE VTP DOMAIN FIRST
Cannot set the version to 3 because domain name is not configured
SW01(config)#vtp domain ?
WORD The ascii name for the VTP administrative domain.
SW01(config)#vtp domain vtp domain CORE
Changing VTP domain name from NULL to CORE
SW01(config)#vtp mode server ?
client Set the device to client mode.
off Set the device to off mode.
server Set the device to server mode.
transparent Set the device to transparent mode.
SW01(config)#vtp mode server ?
mst Set the mode for MST VTP instance.
unknown Set the mode for unknown VTP instances.
vlan Set the mode for VLAN VTP instance.
<cr>
SW01(config)#vtp mode server mst // ONLY SUPPORTED IN VTPv3
Device MST VTP mode cannot be changed in VTP version 1
SW01(config)#end
SW01#vtp primary ?
force Do not check for conflicting devices
mst MST feature
vlan Vlan feature
<cr>
SW01#vtp primary // NOT STORED IN NVRAM; NEED TO RE-CONFIGURE AGAIN WHEN SWITCH REBOOTS; SECONDARY VTP SERVER/SWITCH DOESN'T AUTOMATICALLY BECOME VTP PRIMARY SERVER
System can be made Primary Server only in VTP version 3
SW01#vtp primary mst
System can be made Primary Server only in VTP version 3
SW01#show vtp status
VTP Version capable : 1 to 3
VTP version running : 1
VTP Domain Name : CORE
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 003c.109f.4f80
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 0.0.0.0 (no valid interface found)
Feature VLAN:
--------------
VTP Operating Mode : Server
Maximum VLANs supported locally : 1005
Number of existing VLANs : 5
Configuration Revision : 0
MD5 digest : 0x15 0x89 0x9A 0xAE 0xF4 0x42 0x44 0x7D
0xCA 0x15 0x45 0x7A 0x3B 0xA4 0x2E 0x64
SW01#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW01(config)#spanning-tree mode ?
mst Multiple spanning tree mode
pvst Per-Vlan spanning tree mode
rapid-pvst Per-Vlan rapid spanning tree mode
SW01(config)#spanning-tree mode mst
SW01(config)#vtp version 3
SW01(config)#
*Feb 7 03:22:33.292: %SW_VLAN-6-OLD_CONFIG_FILE_READ: Old version 2 VLAN configuration file detected and read OK. Version 3 files will be written in the future.
SW01(config)#do show vtp status
VTP Version capable : 1 to 3
VTP version running : 3
VTP Domain Name : CORE
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 003c.109f.4f80
Feature VLAN:
--------------
VTP Operating Mode : Server
Number of existing VLANs : 5
Number of existing extended VLANs : 0
Maximum VLANs supported locally : 4096
Configuration Revision : 0
Primary ID : 0000.0000.0000
Primary Description :
MD5 digest :
Feature MST:
--------------
VTP Operating Mode : Transparent
Feature UNKNOWN:
--------------
VTP Operating Mode : Transparent
SW01(config)#vtp mode server mst
Setting device to VTP Server mode for MST.
SW01(config)#end
SW01#vtp primary force // ENTER IN PRIVILEGE MODE; ONLY ONE PRIMARY SERVER IS ALLOWED; PRIMARY SERVER STATUS LOST WHEN SWITCH REBOOTS
This system is becoming primary server for feature vlan
SW01#
*Feb 7 03:23:34.402: %SW_VLAN-4-VTP_PRIMARY_SERVER_CHG: 003c.109f.4abc has become the primary server for the VLAN VTP feature
SW01#vtp primary mst
This system is becoming primary server for feature mst
No conflicting VTP3 devices found.
Do you want to continue? [confirm] // PRESS ENTER
SW01#
*Feb 7 03:24:06.016: %SW_VLAN-4-VTP_PRIMARY_SERVER_CHG: 003c.109f.4f80 has become the primary server for the MST VTP feature
SW01(config)#spanning-tree ?
backbonefast Enable BackboneFast Feature
etherchannel Spanning tree etherchannel specific configuration
extend Spanning Tree 802.1t extensions
logging Enable Spanning tree logging
loopguard Spanning tree loopguard options
mode Spanning tree operating mode
mst Multiple spanning tree configuration
pathcost Spanning tree pathcost options
portfast Spanning tree portfast options
transmit STP transmit parameters
uplinkfast Enable UplinkFast Feature
vlan VLAN Switch Spanning Tree
SW01(config)#spanning-tree mst ?
WORD MST instance range, example: 0-3,5,7-9
configuration Enter MST configuration submode
forward-time Set the forward delay for the spanning tree
hello-time Set the hello interval for the spanning tree
max-age Set the max age interval for the spanning tree
max-hops Set the max hops value for the spanning tree
SW01(config)#spanning-tree mst configuration
SW01(config-mst)#?
abort Exit region configuration mode, aborting changes
exit Exit region configuration mode, applying changes
instance Map vlans to an MST instance
name Set configuration name
no Negate a command or set its defaults
private-vlan Set private-vlan synchronization
revision Set configuration revision number
show Display region configurations
SW01(config-mst)#name CORE
SW01(config-mst)#revison ?
<0-65535> Configuration revision number
SW01(config-mst)#revision 1
SW01(config-mst)#instance ?
<0-4094> MST instance id
SW01(config-mst)#instance 1 ?
vlan Range of vlans to add to the instance mapping
SW01(config-mst)#instance 1 vlan 2-4094
SW01(config-mst)#exit
SW01(config)#spanning-tree mst 0-1 ?
WORD MST instance range, example: 0-3,5,7-9
configuration Enter MST configuration submode
forward-time Set the forward delay for the spanning tree
hello-time Set the hello interval for the spanning tree
max-age Set the max age interval for the spanning tree
max-hops Set the max hops value for the spanning tree
SW01(config)#spanning-tree mst 0-1 ?
priority Set the bridge priority for the spanning tree
root Configure switch as root
SW01(config)#spanning-tree mst 0-1 priority ?
<0-61440> bridge priority in increments of 4096
SW01(config)#spanning-tree mst 0-1 priority 4096 // SET TO LOWEST PRIORITY TO BECOME ROOT SWITCH
SW01#show spanning-tree mst configuration
Name [CORE]
Revision 1 Instances configured 2
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 1 // MGMT VLAN; INSTANCE 0 CREATED BY DEFAULT
1 2-4094 // CUSTOMER VLAN
-------------------------------------------------------------------------------
This is the configuration for SW02.
SW02#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW02(config)#spanning-tree mode mst
SW02(config)#spanning-tree extend system-id
SW02(config)#spanning-tree mst 0-1 priority 8192 // SECONDARY ROOT SWITCH
SW02(config)#spanning-tree mst configuration
SW02(config-mst)# name CORE
SW02(config-mst)# revision 1
SW02(config-mst)# instance 1 vlan 2-4094
SW02(config-mst)#exit
SW02(config)#vtp domain CORE
Changing VTP domain name from NULL to CORE
SW02(config)#
*Feb 7 03:28:39.961: %SW_VLAN-6-VTP_DOMAIN_NAME_CHG: VTP domain name changed to CORE.
SW02(config)#vtp version 3
SW02(config)#
*Feb 7 03:28:46.010: %SW_VLAN-6-OLD_CONFIG_FILE_READ: Old version 2 VLAN configuration file detected and read OK. Version 3
files will be written in the future.
SW02(config)#vtp mode ?
client Set the device to client mode.
off Set the device to off mode.
server Set the device to server mode.
transparent Set the device to transparent mode.
SW02(config)#vtp mode server // DEFAULT VTP MODE
Device mode already VTP Server for VLANS.
I've configured a Layer 2 EtherChannel trunk so VLANs configured on SW01 will automatically propagate to SW02.
SW02(config)#interface range GigabitEthernet1/0/47-48
SW02(config-if-range)#shutdown // BEST PRACTICE IS TO SHUTDOWN FIRST THE PORTS TO BE CONFIGURED FOR ETHERCHANNEL
SW02(config-if-range)# description ### Trunk: SW01 ###
SW02(config-if-range)# switchport mode trunk
SW02(config-if-range)# channel-group 1 mode desirable
Creating a port-channel interface Port-channel 1
SW02(config-if-range)# no shutdown
SW02(config-if-range)#
SW02(config-if-range)#
*Feb 7 03:31:05.878: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to down
*Feb 7 03:31:05.878: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/48, changed state to down
SW02(config-if-range)#interface Port-channel1 // LAYER 2 ETHERCHANNEL TRUNK
SW02(config-if)# description ### Trunk: SW01 ###
SW02(config-if)# switchport mode trunk
SW02(config-if)#end
SW02#sh run interface g01/0/47
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/47
description ### Trunk: SW01 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW02#sh run interface g1/0/48
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/48
description ### Trunk: SW01 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW02#sh run interface po1
Building configuration...
Current configuration : 93 bytes
!
interface Port-channel1
description ### Trunk: SW01 ###
switchport mode trunk
end
SW02#show vtp ?
counters VTP statistics
devices VTP3 domain device information
interface VTP interface status and configuration
password VTP password
status VTP domain status
SW02#show vtp devices
Retrieving information from the VTP domain. Waiting for 5 seconds.
VTP Feature Conf Revision Primary Server Device ID Device Description
------------ ---- -------- -------------- -------------- ----------------------
VLAN No 2 003c.109f.4f80=003c.109f.4abc SW01
MST Yes 2 003c.109f.4f80=003c.109f.4abc SW01
SW02#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW02(config)#vlan 100
VTP VLAN configuration not allowed when device is not the primary server for vlan database. ONLY VTP PRIMARY SERVER CAN ADD/REMOVE VLANS
SW01(config)#interface range GigabitEthernet1/0/47-48
SW01(config-if-range)#shutdown
SW01(config-if-range)#description ### Trunk: SW02 ###
SW01(config-if-range)#switchport mode trunk
SW01(config-if-range)#channel-group 1 mode desirable
Creating a port-channel interface Port-channel 1
SW01(config-if-range)# no shutdown
SW01(config-if-range)#interface Port-channel1
SW01(config-if)# description ### Trunk: SW02 ###
SW01(config-if)# switchport mode trunk
SW01(config-if)#
*Feb 7 03:33:27.837: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to down
*Feb 7 03:33:27.837: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/48, changed state to down
*Feb 7 03:33:30.540: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to up
*Feb 7 03:33:30.698: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/48, changed state to up
*Feb 7 03:33:34.369: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/47, changed state to up
*Feb 7 03:33:34.499: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/48, changed state to up
*Feb 7 03:33:35.369: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up
SW01(config-if)#
*Feb 7 03:33:36.367: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up
SW01#show run interface g1/0/47
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/47
description ### Trunk: SW02 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW01#show run interface g1/0/48
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/48
description ### Trunk: SW02 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW01#show run interface p01
Building configuration...
Current configuration : 93 bytes
!
interface Port-channel1
description ### Trunk: SW02 ###
switchport mode trunk
end
SW01#show etherchannel ?
<1-128> Channel group number
detail Detail information
load-balance Load-balance/frame-distribution scheme among ports in
port-channel
port Port information
port-channel Port-channel information
protocol protocol enabled
summary One-line summary per channel-group
| Output modifiers
<cr>
SW01#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/47(P) Gi1/0/48(P)
SW01#
*Feb 7 03:34:29.880: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/47, changed state to down // I REMOVED THE CABLE ON G1/0/47
*Feb 7 03:34:30.879: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to down
SW01#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/47(D) Gi1/0/48(P)
SW01#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW02 Gig 1/0/48 177 S I WS-C3850- Gig 1/0/48
Total cdp entries displayed : 1
SW01#
*Feb 7 03:34:56.207: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to up // PUT BACK CABLE ON G1/0/47
*Feb 7 03:35:00.050: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/47, changed state to up
SW01#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/47(P) Gi1/0/48(P)
SW01#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW02 Gig 1/0/47 177 S I WS-C3850- Gig 1/0/47
SW02 Gig 1/0/48 154 S I WS-C3850- Gig 1/0/48
Total cdp entries displayed : 2
- Encrypted VTP password
- Backward compatibility with VTP version 2
- Protection mechanism from overwriting a wrong VLAN database with higher revision number
- Supports IEEE 802.1Q Extended VLANs 1006 - 4094
- Supports Private VLAN (PVLAN) propagation
- Supports Multiple Spanning Tree (MST) propagation
- Supports Remote SPAN (RSPAN)
Switch#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)#hostname SW01
SW01(config)#vtp version ?
<1-3> Set the administrative domain VTP version number
SW01config)#vtp version 3 // NEED TO CONFIGURE VTP DOMAIN FIRST
Cannot set the version to 3 because domain name is not configured
SW01(config)#vtp domain ?
WORD The ascii name for the VTP administrative domain.
SW01(config)#vtp domain vtp domain CORE
Changing VTP domain name from NULL to CORE
SW01(config)#vtp mode server ?
client Set the device to client mode.
off Set the device to off mode.
server Set the device to server mode.
transparent Set the device to transparent mode.
SW01(config)#vtp mode server ?
mst Set the mode for MST VTP instance.
unknown Set the mode for unknown VTP instances.
vlan Set the mode for VLAN VTP instance.
<cr>
SW01(config)#vtp mode server mst // ONLY SUPPORTED IN VTPv3
Device MST VTP mode cannot be changed in VTP version 1
SW01(config)#end
SW01#vtp primary ?
force Do not check for conflicting devices
mst MST feature
vlan Vlan feature
<cr>
SW01#vtp primary // NOT STORED IN NVRAM; NEED TO RE-CONFIGURE AGAIN WHEN SWITCH REBOOTS; SECONDARY VTP SERVER/SWITCH DOESN'T AUTOMATICALLY BECOME VTP PRIMARY SERVER
System can be made Primary Server only in VTP version 3
SW01#vtp primary mst
System can be made Primary Server only in VTP version 3
SW01#show vtp status
VTP Version capable : 1 to 3
VTP version running : 1
VTP Domain Name : CORE
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 003c.109f.4f80
Configuration last modified by 0.0.0.0 at 0-0-00 00:00:00
Local updater ID is 0.0.0.0 (no valid interface found)
Feature VLAN:
--------------
VTP Operating Mode : Server
Maximum VLANs supported locally : 1005
Number of existing VLANs : 5
Configuration Revision : 0
MD5 digest : 0x15 0x89 0x9A 0xAE 0xF4 0x42 0x44 0x7D
0xCA 0x15 0x45 0x7A 0x3B 0xA4 0x2E 0x64
SW01#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW01(config)#spanning-tree mode ?
mst Multiple spanning tree mode
pvst Per-Vlan spanning tree mode
rapid-pvst Per-Vlan rapid spanning tree mode
SW01(config)#spanning-tree mode mst
SW01(config)#vtp version 3
SW01(config)#
*Feb 7 03:22:33.292: %SW_VLAN-6-OLD_CONFIG_FILE_READ: Old version 2 VLAN configuration file detected and read OK. Version 3 files will be written in the future.
SW01(config)#do show vtp status
VTP Version capable : 1 to 3
VTP version running : 3
VTP Domain Name : CORE
VTP Pruning Mode : Disabled
VTP Traps Generation : Disabled
Device ID : 003c.109f.4f80
Feature VLAN:
--------------
VTP Operating Mode : Server
Number of existing VLANs : 5
Number of existing extended VLANs : 0
Maximum VLANs supported locally : 4096
Configuration Revision : 0
Primary ID : 0000.0000.0000
Primary Description :
MD5 digest :
Feature MST:
--------------
VTP Operating Mode : Transparent
Feature UNKNOWN:
--------------
VTP Operating Mode : Transparent
SW01(config)#vtp mode server mst
Setting device to VTP Server mode for MST.
SW01(config)#end
SW01#vtp primary force // ENTER IN PRIVILEGE MODE; ONLY ONE PRIMARY SERVER IS ALLOWED; PRIMARY SERVER STATUS LOST WHEN SWITCH REBOOTS
This system is becoming primary server for feature vlan
SW01#
*Feb 7 03:23:34.402: %SW_VLAN-4-VTP_PRIMARY_SERVER_CHG: 003c.109f.4abc has become the primary server for the VLAN VTP feature
SW01#vtp primary mst
This system is becoming primary server for feature mst
No conflicting VTP3 devices found.
Do you want to continue? [confirm] // PRESS ENTER
SW01#
*Feb 7 03:24:06.016: %SW_VLAN-4-VTP_PRIMARY_SERVER_CHG: 003c.109f.4f80 has become the primary server for the MST VTP feature
SW01(config)#spanning-tree ?
backbonefast Enable BackboneFast Feature
etherchannel Spanning tree etherchannel specific configuration
extend Spanning Tree 802.1t extensions
logging Enable Spanning tree logging
loopguard Spanning tree loopguard options
mode Spanning tree operating mode
mst Multiple spanning tree configuration
pathcost Spanning tree pathcost options
portfast Spanning tree portfast options
transmit STP transmit parameters
uplinkfast Enable UplinkFast Feature
vlan VLAN Switch Spanning Tree
SW01(config)#spanning-tree mst ?
WORD MST instance range, example: 0-3,5,7-9
configuration Enter MST configuration submode
forward-time Set the forward delay for the spanning tree
hello-time Set the hello interval for the spanning tree
max-age Set the max age interval for the spanning tree
max-hops Set the max hops value for the spanning tree
SW01(config)#spanning-tree mst configuration
SW01(config-mst)#?
abort Exit region configuration mode, aborting changes
exit Exit region configuration mode, applying changes
instance Map vlans to an MST instance
name Set configuration name
no Negate a command or set its defaults
private-vlan Set private-vlan synchronization
revision Set configuration revision number
show Display region configurations
SW01(config-mst)#name CORE
SW01(config-mst)#revison ?
<0-65535> Configuration revision number
SW01(config-mst)#revision 1
SW01(config-mst)#instance ?
<0-4094> MST instance id
SW01(config-mst)#instance 1 ?
vlan Range of vlans to add to the instance mapping
SW01(config-mst)#instance 1 vlan 2-4094
SW01(config-mst)#exit
SW01(config)#spanning-tree mst 0-1 ?
WORD MST instance range, example: 0-3,5,7-9
configuration Enter MST configuration submode
forward-time Set the forward delay for the spanning tree
hello-time Set the hello interval for the spanning tree
max-age Set the max age interval for the spanning tree
max-hops Set the max hops value for the spanning tree
SW01(config)#spanning-tree mst 0-1 ?
priority Set the bridge priority for the spanning tree
root Configure switch as root
SW01(config)#spanning-tree mst 0-1 priority ?
<0-61440> bridge priority in increments of 4096
SW01(config)#spanning-tree mst 0-1 priority 4096 // SET TO LOWEST PRIORITY TO BECOME ROOT SWITCH
SW01#show spanning-tree mst configuration
Name [CORE]
Revision 1 Instances configured 2
Instance Vlans mapped
-------- ---------------------------------------------------------------------
0 1 // MGMT VLAN; INSTANCE 0 CREATED BY DEFAULT
1 2-4094 // CUSTOMER VLAN
-------------------------------------------------------------------------------
This is the configuration for SW02.
SW02#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW02(config)#spanning-tree mode mst
SW02(config)#spanning-tree extend system-id
SW02(config)#spanning-tree mst 0-1 priority 8192 // SECONDARY ROOT SWITCH
SW02(config)#spanning-tree mst configuration
SW02(config-mst)# name CORE
SW02(config-mst)# revision 1
SW02(config-mst)# instance 1 vlan 2-4094
SW02(config-mst)#exit
SW02(config)#vtp domain CORE
Changing VTP domain name from NULL to CORE
SW02(config)#
*Feb 7 03:28:39.961: %SW_VLAN-6-VTP_DOMAIN_NAME_CHG: VTP domain name changed to CORE.
SW02(config)#vtp version 3
SW02(config)#
*Feb 7 03:28:46.010: %SW_VLAN-6-OLD_CONFIG_FILE_READ: Old version 2 VLAN configuration file detected and read OK. Version 3
files will be written in the future.
SW02(config)#vtp mode ?
client Set the device to client mode.
off Set the device to off mode.
server Set the device to server mode.
transparent Set the device to transparent mode.
SW02(config)#vtp mode server // DEFAULT VTP MODE
Device mode already VTP Server for VLANS.
I've configured a Layer 2 EtherChannel trunk so VLANs configured on SW01 will automatically propagate to SW02.
SW02(config)#interface range GigabitEthernet1/0/47-48
SW02(config-if-range)#shutdown // BEST PRACTICE IS TO SHUTDOWN FIRST THE PORTS TO BE CONFIGURED FOR ETHERCHANNEL
SW02(config-if-range)# description ### Trunk: SW01 ###
SW02(config-if-range)# switchport mode trunk
SW02(config-if-range)# channel-group 1 mode desirable
Creating a port-channel interface Port-channel 1
SW02(config-if-range)# no shutdown
SW02(config-if-range)#
SW02(config-if-range)#
*Feb 7 03:31:05.878: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to down
*Feb 7 03:31:05.878: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/48, changed state to down
SW02(config-if-range)#interface Port-channel1 // LAYER 2 ETHERCHANNEL TRUNK
SW02(config-if)# description ### Trunk: SW01 ###
SW02(config-if)# switchport mode trunk
SW02(config-if)#end
SW02#sh run interface g01/0/47
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/47
description ### Trunk: SW01 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW02#sh run interface g1/0/48
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/48
description ### Trunk: SW01 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW02#sh run interface po1
Building configuration...
Current configuration : 93 bytes
!
interface Port-channel1
description ### Trunk: SW01 ###
switchport mode trunk
end
SW02#show vtp ?
counters VTP statistics
devices VTP3 domain device information
interface VTP interface status and configuration
password VTP password
status VTP domain status
SW02#show vtp devices
Retrieving information from the VTP domain. Waiting for 5 seconds.
VTP Feature Conf Revision Primary Server Device ID Device Description
------------ ---- -------- -------------- -------------- ----------------------
VLAN No 2 003c.109f.4f80=003c.109f.4abc SW01
MST Yes 2 003c.109f.4f80=003c.109f.4abc SW01
SW02#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
SW02(config)#vlan 100
VTP VLAN configuration not allowed when device is not the primary server for vlan database. ONLY VTP PRIMARY SERVER CAN ADD/REMOVE VLANS
SW01(config)#interface range GigabitEthernet1/0/47-48
SW01(config-if-range)#shutdown
SW01(config-if-range)#description ### Trunk: SW02 ###
SW01(config-if-range)#switchport mode trunk
SW01(config-if-range)#channel-group 1 mode desirable
Creating a port-channel interface Port-channel 1
SW01(config-if-range)# no shutdown
SW01(config-if-range)#interface Port-channel1
SW01(config-if)# description ### Trunk: SW02 ###
SW01(config-if)# switchport mode trunk
SW01(config-if)#
*Feb 7 03:33:27.837: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to down
*Feb 7 03:33:27.837: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/48, changed state to down
*Feb 7 03:33:30.540: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to up
*Feb 7 03:33:30.698: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/48, changed state to up
*Feb 7 03:33:34.369: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/47, changed state to up
*Feb 7 03:33:34.499: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/48, changed state to up
*Feb 7 03:33:35.369: %LINK-3-UPDOWN: Interface Port-channel1, changed state to up
SW01(config-if)#
*Feb 7 03:33:36.367: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to up
SW01#show run interface g1/0/47
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/47
description ### Trunk: SW02 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW01#show run interface g1/0/48
Building configuration...
Current configuration : 133 bytes
!
interface GigabitEthernet1/0/48
description ### Trunk: SW02 ###
switchport mode trunk
channel-group 1 mode desirable
end
SW01#show run interface p01
Building configuration...
Current configuration : 93 bytes
!
interface Port-channel1
description ### Trunk: SW02 ###
switchport mode trunk
end
SW01#show etherchannel ?
<1-128> Channel group number
detail Detail information
load-balance Load-balance/frame-distribution scheme among ports in
port-channel
port Port information
port-channel Port-channel information
protocol protocol enabled
summary One-line summary per channel-group
| Output modifiers
<cr>
SW01#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/47(P) Gi1/0/48(P)
SW01#
*Feb 7 03:34:29.880: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/47, changed state to down // I REMOVED THE CABLE ON G1/0/47
*Feb 7 03:34:30.879: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to down
SW01#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/47(D) Gi1/0/48(P)
SW01#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW02 Gig 1/0/48 177 S I WS-C3850- Gig 1/0/48
Total cdp entries displayed : 1
SW01#
*Feb 7 03:34:56.207: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/47, changed state to up // PUT BACK CABLE ON G1/0/47
*Feb 7 03:35:00.050: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/47, changed state to up
SW01#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 1
Number of aggregators: 1
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) PAgP Gi1/0/47(P) Gi1/0/48(P)
SW01#show cdp neighbor
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
SW02 Gig 1/0/47 177 S I WS-C3850- Gig 1/0/47
SW02 Gig 1/0/48 154 S I WS-C3850- Gig 1/0/48
Total cdp entries displayed : 2
