CCIE Routing & Switching v5 Workbook -
CCIE R&S v5 Advanced Technology Labs -
LAN Switching
VTP Transparent
You must load the initial configuration files for the section, Basic
Layer2 Switching, which can be found in
. Reference the Virtual Routers &
Physical Switches Diagram to complete this task.
Task
Configure Ethernet links between SW1 and all other switches as static 802.1q trunks.
Ensure SW1 is the root bridge for all VLANs.
Configure VTP version 2 in domain CCIE as follows:
SW1 in transparent mode
SW2 in server mode
SW3 and SW4 in client mode
Configure VLANs 5, 7, 8, 9, and 10 on VTP server.
Ensure that traffic between hosts within same VLAN is functional regardless of the
switch being connected to.
Configuration
SW1:
vtp domain CCIE
vtp version 2
vtp mode transparent
vlan 5,7,8,9,10
spanning-tree vlan 1-4094 priority 0
!
interface range FastEthernet0/19 - 24
switchport trunk encapsulation dot1q
switchport mode trunk
SW2:
vtp domain CCIE
vtp version 2
vlan 5,7,8,9,10
!
interface range FastEthernet0/23 - 24
switchport trunk encapsulation dot1q
switchport mode trunk
SW3:
vtp domain CCIE
vtp version 2
vtp mode client
!
interface range FastEthernet0/19 - 20
switchport trunk encapsulation dot1q
switchport mode trunk
SW4:
vtp domain CCIE
vtp version 2
vtp mode client
!
interface range FastEthernet0/21 - 22
switchport trunk encapsulation dot1q
switchport mode trunk
Verification
VTP version, just like VTP domain name, can be dynamically learned from VTP
advertisements (if the VTP mode is client or server), but it is configured on all
switches for consistency; VTP version cannot be changed on devices running in
client mode. VTP devices running in transparent mode do not install VTP updates
received, but will continue to forward them unmodified if the domain name of
received VTP advertisements matches its locally configured domain. The
configuration revision number of zero confirms that received VTP updates do not
affect the local VLAN database.
SW1#show vtp status
VTP Version capable
: 1 to 3VTP version running: 2
VTP Domain Name
: CCIE
VTP Pruning Mode
: Disabled
VTP Traps Generation
: Disabled
Device ID
: 0013.605f.f000
Configuration last modified by 0.0.0.0 at 3-24-93 21:11:43
Feature VLAN:
--------------VTP Operating Mode: Transparent
Maximum VLANs supported locally : 1005
Number of existing VLANs: 10Configuration Revision: 0
MD5 digest: 0x6B 0x36 0x65 0xF9 0xD9 0x10 0x51 0xED
0xA8 0x25 0xC5 0x35 0xC9 0x38 0x9F 0x0F
Because VTP is control-plane only and does not directly relate to STP forwarding,
VTP traffic from the server/client or from an entirely different VTP domain can be in
the same broadcast domain as VTP transparent switches. In this particular case,
SW1 must be locally configured with all VLANs from the VTP domain, because it is
in the physical Layer 2 transit path for data-plane traffic within those VLANs. If a
switch receives tagged frames for which the VLAN does not exist in the database,
frames are silently dropped; this can be seen from the fact that the switch does not
have any of its ports in STP forwarding state for non-existing VLANs. Before VLANs
are manually configured on SW1:
SW2#show spanning-tree interface fastEthernet0/23
VlanRole Sts CostPrio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
VLAN0001
Desg FWD 19
128.25 P2p
VLAN0005
Desg FWD 19
128.25 P2p
VLAN0007
Desg FWD 19
128.25 P2p
VLAN0008
Desg FWD 19
128.25 P2p
VLAN0009
Desg FWD 19
128.25 P2p
VLAN0010
Desg FWD 19
128.25 P2p
!SW1#show spanning-tree interface fastEthernet0/23
VlanRole Sts CostPrio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
VLAN0001Root FWD 19128.25 P2p
Verify that the VLAN database has been learned by VTP clients, so the VTP device
in transparent mode, SW1, has relayed the VTP messages between its trunk ports
(from VTP server to VTP clients).
SW2#show vlan brief
VLAN NameStatus Ports
---- -------------------------------- --------- -------------------------------
1defaultactive 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, Gi0/1, Gi0/25 VLAN0005
active7
VLAN0007
active8
VLAN0008
active9
VLAN0009
active10
VLAN0010
active
1002 fddi-default
act/unsup
1003 token-ring-default
act/unsup
1004 fddinet-default
act/unsup
1005 trnet-default
act/unsup
!
!SW3#show vlan brief
VLAN NameStatus Ports
---- -------------------------------- --------- -------------------------------
1defaultactive 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, Fa0/21, Fa0/22
Fa0/23, Fa0/24, Gi0/1, Gi0/25 VLAN0005
active7
VLAN0007
active8
VLAN0008
active9
VLAN0009
active10
VLAN0010
active
1002 fddi-default
act/unsup
1003 token-ring-default
act/unsup
1004 fddinet-default
act/unsup
1005 trnet-default
act/unsup
Changes in the rest of the VTP domain, such as VLAN adds or removes, does not
affect the transparent switches, which just relay VTP messages.
SW1#debug sw-vlan vtp events
vtp events debugging is on
!
!SW2#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.SW2(config)#vlan 123
!
!SW3#show vlan | include ^123
123 VLAN0123active
123 enet 1001231500 ---- -00
!
!SW4#show vlan | include ^123
123 VLAN0123active
123 enet 1001231500 ---- -00
!
!SW1#show vlan | include ^123
SW1#
The following log messages will appear on the SW1 console, confirming that VTP
messages are received from the VTP server and relayed on all other switches.
VTP LOG RUNTIME:Relaying packet received on trunk Fa0/23 - in TRANSPARENT MODE
(nc = false)
VTP LOG RUNTIME: Relaying packet received on trunk Fa0/23 - in TRANSPARENT MODE (nc = false)
VTP LOG RUNTIME:Relaying packet received on trunk Fa0/19 - in TRANSPARENT MODE
(nc = false)VTP LOG RUNTIME:Relaying packet received on trunk Fa0/21 - in TRANSPARENT MODE
(nc = false)
VTP LOG RUNTIME: Relaying packet received on trunk Fa0/19 - in TRANSPARENT MODE (nc = false)
VTP LOG RUNTIME: Relaying packet received on trunk Fa0/21 - in TRANSPARENT MODE (nc = false)
VTP LOG RUNTIME:Relaying packet received on trunk Fa0/20 - in TRANSPARENT MODE
(nc = false)VTP LOG RUNTIME:Relaying packet received on trunk Fa0/22 - in TRANSPARENT MODE
(nc = false)
VTP LOG RUNTIME: Relaying packet received on trunk Fa0/20 - in TRANSPARENT MODE (nc = false)
VTP LOG RUNTIME: Relaying packet received on trunk Fa0/22 - in TRANSPARENT MODE (nc = false)
Note that when a switch is in VTP transparent mode, the VLAN configuration
statements appear in the running-configuration. If the switch is in VTP client/server
mode, the configured VLANs do not appear in the running-configuration; these are
kept in the VLAN database file.
SW1# show running-config | i vlan
vlan internal allocation policy ascendingvlan 5,7-10
!
!SW2#show running-config | i vlan
vlan internal allocation policy ascending