User's Manual

Key Considerations 496
Troubleshooting 496
The Device Warranty dialog box is not displayed after a Network
Discovery 496
3Com Network Director lists some devices as unregistered, although
you have already registered them on the 3Com website 496
Frequently Asked Questions 497
Why are some registered devices missing from the email? 497
Why is there no warranty associated with some of the devices in the
email? 497
13 VLAN MANAGEMENT
Overview 499
Viewing the VLANs configured on your network 499
Configuring VLANs on your network 499
Key Concepts 500
General VLAN concepts 500
About VLANs 500
Benefits of VLANs 501
802.1Q VLANs 502
Port-based VLANs 502
Tagged and untagged VLAN membership 503
The Default VLAN 504
Communication between VLANs 504
3Com Network Director VLAN Concepts 508
Discovering VLANs in 3Com Network Director 508
VLAN membership inference 509
Components 514
Show VLANs 514
Filter View button 516
Interaction with Trace Path 516
Maps with no VLAN information 517
VLAN names 517
Find Dialog Box 520
Options Dialog Box 521
VLAN membership 523
Properties dialog box 524
VLANs tab for VLAN-aware switches 524