Cisco WS-C4003 Software Guide - Page 156
Flooding Traffic without VTP Pruning
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Understanding How VTP Works Figure 9-1 Flooding Traffic without VTP Pruning Switch 4 Port 2 Switch 5 Switch 2 Red VLAN Chapter 9 Configuring VTP Switch 6 Switch 3 Switch 1 Port 1 S5812 Figure 9-2 shows the same switched network with VTP pruning enabled. The broadcast traffic from Switch 1 is not forwarded to Switches 3, 5, and 6 because traffic for the Red VLAN has been pruned on the links indicated (port 5 on Switch 2 and port 4 on Switch 4). Figure 9-2 Flooding Traffic with VTP Pruning Switch 4 Port 2 Flooded traffic is pruned Port 4 Switch 5 Switch 2 Port 5 Red VLAN Port 1 S5813 Switch 6 Switch 3 Switch 1 Enabling VTP pruning on a VTP server enables pruning for the entire management domain. VTP pruning takes effect several seconds after you enable it. By default, VLANs 2 through 1000 are pruning eligible. VTP pruning does not prune traffic from VLANs that are pruning ineligible. VLAN 1 is always pruning ineligible; traffic from VLAN 1 cannot be pruned. To make a VLAN pruning ineligible, enter the clear vtp prunning command. To make a VLAN pruning eligible again, enter the set vtp pruneeligible command. You can set VLAN pruning eligibility regardless of whether VTP pruning is enabled or disabled for the domain. Pruning eligibility always applies to the local device only, not for the entire VTP domain. Software Configuration Guide-Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4 9-4 78-12647-02
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