VTP Pruning not working correctly

@noneill wrote:

vtp.png1194x887 11.3 KB

The links between all switches are trunks. VTP is enabled and VLANs 1-3 are configured. lxc-1 and lxc-2 are in Vlan 2 with lxc-3 in Vlan 3. VTP pruning is enabled. Below is the output from SW3 where G0/2 is the trunk to SW2:

SW3#sh vtp status
VTP Version capable : 1 to 3
VTP version running : 1
VTP Domain Name : NICKO
VTP Pruning Mode : Enabled
VTP Traps Generation : Disabled
Device ID : fa16.3e95.8bcf
Configuration last modified by 10.255.0.201 at 11-24-15 10:48:56
Local updater ID is 10.255.0.202 on interface Gi0/0 (first layer3 interface found)

Feature VLAN:

VTP Operating Mode : Server
Maximum VLANs supported locally : 1005
Number of existing VLANs : 7
Configuration Revision : 5
MD5 digest : 0x05 0x02 0xE4 0x91 0x48 0x11 0x7F 0xFF
0xCE 0x6B 0xE1 0x41 0x42 0x50 0xEB 0xF3
SW3#sh int trun

Port Mode Encapsulation Status Native vlan
Gi0/2 on 802.1q trunking 1

Port Vlans allowed on trunk
Gi0/2 1-4094

Port Vlans allowed and active in management domain
Gi0/2 1-3

Port Vlans in spanning tree forwarding state and not pruned
Gi0/2 1-2
SW3#sh int prunin

Port Vlans pruned for lack of request by neighbor
Gi0/2 3

Port Vlan traffic requested of neighbor
Gi0/2 1,3

As you can see Vlan 3 traffic should not go onto the trunk yet when I run a traffic capture I see ARP requests from lxc-3 on the trunk G0/2.

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