Cisco Catalyst 2960 Software Configuration Manual page 417

Chapter 14 Configuring VTP
Figure 14-1
Switch F
Figure 14-2
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 14-2
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-26520-01
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
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
Port 2
Red
VLAN
Port 1
Switch A
Red
VLAN
Port 1
Switch A
14-16. VTP pruning takes effect several seconds after
Understanding VTP
14-7