Refer to the exhibit. VLANs 50 and 60 exist on the trunk links between all switches. All access ports on SW3 are configured for VLAN 50 and SW1 is the VTP server. Which command ensures that SW3 receives frames only from VLAN 50?
VTP pruning should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VTP pruning.
D is correct, since SW1 is the VTP server
D is correct
VTP pruning helps to prevent unnecessary VLAN traffic from being sent over trunk links to switches that do not have access ports in those VLANs.
Since all access ports on SW3 are configured for VLAN 50, enabling VTP pruning on VTP server (SW1) will prevent VLAN 60 traffic from being sent to SW3.
Another question I hate Cisco for. C and D are both valid options. It depends. To really answer that question we would need more information. Knowing Cisco they probably want us to got with D, because Cisco likes enterprise business.....
as described in provided link.....
"VTP pruning should only be enabled on VTP servers, all the clients in the VTP domain will automatically enable VTP pruning. By default, VLANs 2 – 1001 are pruning eligible, but VLAN 1 can’t be pruned because it’s an administrative VLAN. Both VTP versions 1 and 2 support pruning."
far-end has vlan30 allowed on trunk:
sw1(config)#do s int tru
Port Mode Encapsulation Status Native vlan
Et0/0 on 802.1q trunking 1
Et0/3 desirable n-isl trunking 1
Po2 on 802.1q trunking 1
Port Vlans allowed on trunk
Et0/0 1-4094
Et0/3 1-4094
Po2 1-4094
Port Vlans allowed and active in management domain
Et0/0 1,10,30,40,50
Et0/3 1,10,30,40,50
Po2 1,10,30,40,50
Port Vlans in spanning tree forwarding state and not pruned
Et0/0 1,10,30,40,50
Et0/3 1,30 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Po2 1
sw1(config)#
pruning feature allows\add this vlan50 to the forwarding on the trunk on the upstream sw1:
sw1(config)#do s int tru
... omitted...
Port Vlans allowed and active in management domain
Et0/0 1,10,30,40,50
Et0/3 1,10,30,40,50
Po2 1,10,30,40,50
Port Vlans in spanning tree forwarding state and not pruned
Et0/0 1,10,30,40,50
Et0/3 1,30,50 <<<<<<<<<<<<<<<<<<<<< + vlan 50
Po2 1
sw1(config)#
Doesn't pruning only suppress traffic where it's not needed? The only reason SW3 won't get VLAN 60 traffic is because it doesn't need it. If SW2 has ports in VLAN 60, it will receive the VLAN 60 frames, even with pruning applied everywhere.
Vlan pruning can happen on switch 2 as well, the main reason to apply then to pruning in this case and this is the best practice. Applying the pruning at the source rather than wait for the vlan traffic travel to the sw2 then pruning it there. The same concept apply to access-list.
Any documentation on that? I have some doubts here because you can configure pruning on vtp clients as well..
upvoted 6 times
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