Summary
133
Notice, once again, that when you enable a VLAN for pruning, by
default, it configures all of the VLANs. Use the following command to clear
the unwanted VLANs:
Console> (enable) clear vtp pruneeligible 3-1005
Vlans 1,3-1005 will not be pruned on this device.
VTP domain Globalnet modified.
Console> (enable)
To verify the pruned state of a trunk port, use the show trunk command.
Summary
I
n this chapter, you learned how to break up broadcast domains in layer 2
switched networks: by creating virtual LANs. When you create VLANs, you
are able to create smaller broadcast domains within a switch by assigning
different ports in the switch to different subnetworks.
We showed you how to configure VLANs on both set-based and IOS-
based switches. It is important to understand how to configure VLANs on
both types of switch as well as how to set the configuration of VLANs on
individual interfaces.
We also showed you how to configure trunking between links on an
access layer switch and a distribution layer switch, where trunking allows
you to send information about multiple VLANs down one link, in contrast
to an access link that only can send information about one VLAN.
The chapter ended with a discussion of VLAN Trunk Protocol (VTP),
which really doesn't have much to do with trunking other than the fact that
VTP information is sent down trunked links only. VTP is used to update all
switches in the internetwork with VLAN information.
Key Terms
Before you take the exam, be sure you're familiar with the following terms:
access link
local VLANs
dynamic VLANs
static VLAN
end-to-end VLANs
switch-fabric
flat network
trunk links
frame tagging
VTP pruning
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