Cisco Catalyst 3560-X Software Configuration Manual page 495

Chapter 1 Configuring VTP
Figure 1-1
Switch F
Figure 1-2
is not forwarded to Switches C, E, and F because traffic for the Red VLAN has been pruned on the links
shown (Port 5 on Switch B and Port 4 on Switch D).
Figure 1-2
Flooded traffic
is pruned.
Switch E
Switch F
Enabling VTP pruning on a VTP server enables pruning for the entire management domain. Making
VLANs pruning-eligible or pruning-ineligible affects pruning eligibility for those VLANs on that trunk
only (not on all switches in the VTP domain).
See the
you enable it. VTP pruning does not prune traffic from VLANs that are pruning-ineligible. VLAN 1 and
VLANs 1002 to 1005 are always pruning-ineligible; traffic from these VLANs cannot be pruned.
Extended-range VLANs (VLAN IDs higher than 1005) are also pruning-ineligible.
OL-25303-03
Flooding Traffic without VTP Pruning
Switch D
Switch E
Switch B
Switch C
shows a switched network with VTP pruning enabled. The broadcast traffic from Switch A
Optimized Flooded Traffic with VTP Pruning
Switch D
Port 2
Port
4
Switch B
Flooded traffic
Port
is pruned.
5
Switch C
"Enabling VTP Pruning" section on page
Port 2
Red
VLAN
Port 1
Switch A
Red
VLAN
Port 1
Switch A
1-16. VTP pruning takes effect several seconds after
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Understanding VTP
1-7