VTP Pruning Test
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callmeall
Member Posts: 13 ■□□□□□□□□□
Hi, everyone, here is what I found my testing result on the issue of “VTP Pruning”
I have builded a simple diagram looks like this:
On R1:
interface Ethernet0/0
description which is directly connected to Sw1 F 0/1
ip address 1.1.1.1 255.255.255.0
no shutdown
On R2:interface Ethernet0/0
description which is directly connected to Sw1 F 0/2
ip address 2.2.2.2 255.255.255.0
no shutdown
On R3:
interface Ethernet0/1
description which is directly connected to Sw2 F 0/3
ip address 2.2.2.3 255.255.255.0
no shutdown
On R4:
interface Ethernet0/1
description which is directly connected to Sw2 F 0/4
ip address 1.1.1.4 255.255.255.0
no shutdown
My Sw1:
Vtp domain VTP_PRUNING
Vlan 11 name SITE_1
Vlan 12 name SITE_2
Vlan 100 name VLAN_100
Vlan 200 name VLAN_200
!
interface FastEthernet0/1
switchport access vlan 12
switchport mode access
!
interface FastEthernet0/2
switchport access vlan 13
switchport mode access
My Sw2:
interface FastEthernet0/3
switchport access vlan 13
switchport mode access
!
interface FastEthernet0/4
switchport access vlan 12
switchport mode access
as you can see, the idea is to make R1 (1.1.1.1) ping R4 (1.1.1.4) via VLAN 12 and R2 (2.2.2.2) ping-able to R3 (2.2.2.3) via VLAN 13…
Pay a closer attention to the following info:
Before I enable “vtp pruning”:
Sw1#show interfaces fastEthernet 0/23 trunk
Port Mode Encapsulation Status Native vlan
Fa0/23 desirable n-isl trunking 1
Port Vlans allowed on trunk
Fa0/23 1-4094
Port Vlans allowed and active in management domain
Fa0/23 1,12-13,100,200
Port Vlans in spanning tree forwarding state and not pruned
Fa0/23 1,12-13,100,200
Sw2#show interfaces fastEthernet 0/23 trunk
Port Mode Encapsulation Status Native vlan
Fa0/23 desirable n-isl trunking 1
Port Vlans allowed on trunk
Fa0/23 1-4094
Port Vlans allowed and active in management domain
Fa0/23 1,12-13,100,200
Port Vlans in spanning tree forwarding state and not pruned
Fa0/23 1,12-13,100,200
So far, NOTHING has pruned, that’s because I havn’t enable them yet. By default, the vtp pruning feature is disabled.
I then use “vtp pruning” to enabled on Sw1 and though BPDU packets, Sw2 will enable “vtp pruning” as well.
Now see the results again as the followings:
Sw1# show interfaces fastEthernet 0/23 trunk
Port Mode Encapsulation Status Native vlan
Fa0/23 desirable n-isl trunking 1
Port Vlans allowed on trunk
Fa0/23 1-4094
Port Vlans allowed and active in management domain
Fa0/23 1,12-13,100,200
Port Vlans in spanning tree forwarding state and not pruned
Fa0/23 1,12-13
And this sub-command as well:
Sw1#show interfaces fastEthernet 0/23 pruning
Port Vlans pruned for lack of request by neighbor
Fa0/23 100,200
Port Vlan traffic requested of neighbor
Fa0/23 1,12-13
Cheers,
P.S (in fact, dtlokee is correct, you can see the vtp pruning result with "show interface fa0/1 trunk" command, and I was thinking to use “show interface f 0/23 pruning” command. They are the samething anyways.
The result is showing me exactly what I want to see, and it’s so simple, but I guess sometimes, I just can’t 100% just memorize it according to the text book, I just have to proof it on my own, I don’t know, that’s just me.
Alright, I am out.
Have a nice day guys.CCIE 2008