Cisco WS-CBS3032-DEL Software Configuration Manual page 409

Chapter 14 Configuring VTP
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.
VTP pruning is not designed to function in VTP transparent mode. If one or more switches in the
network are in VTP transparent mode, you should do one of these:
Turn off VTP pruning in the entire network.
•
Turn off VTP pruning by making all VLANs on the trunk of the switch upstream to the VTP
•
transparent switch pruning ineligible.
To configure VTP pruning on an interface, use the switchport trunk pruning vlan interface
configuration command (see the
pruning operates when an interface is trunking. You can set VLAN pruning-eligibility, whether or not
VTP pruning is enabled for the VTP domain, whether or not any given VLAN exists, and whether or not
the interface is currently trunking.
OL-13270-06
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
"Changing the Pruning-Eligible List" section on page
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
Red
VLAN
Port 1
Switch A
14-16. VTP pruning takes effect several seconds after
Understanding VTP
13-21). VTP
14-7