HP Network Direr Software Products manual Checking Vlan connectivity

Components 543

find that you have to configure the VLAN on the same set of inter-switch links, you could save the switches and ports involved as a template and open this template whenever a new VLAN needs to be created.

When you click the OK button in the Selection Editor dialog box, 3Com Network Director will perform some checks on the selected switch ports. If a port has been selected as untagged and the port is already an untagged member of a VLAN, 3Com Network Director will warn you that you may lose contact with any devices that are currently connected to this port. However, 3Com Network Director will not prevent you from proceeding with this port selection.

3Com Network Director will also check for ports that have been selected as tagged that 3Com Network Director thinks should be untagged. By default, 3Com Network Director will assume that the following types of switch port should be untagged:

■Switch ports connected to devices that are not switches e.g. end-stations.

■Switch ports that are currently unconnected.

Again, 3Com Network Director will warn you if have selected ports of these types to be tagged, but will not prevent you from proceeding with this selection.

Checking VLAN connectivity

When you click the Next button in the previous wizard stage, 3Com Network Director will check that there are no gaps in the list of selected switches and ports. For the VLAN to be complete, 3Com Network Director assumes that it should be possible to trace a path from any switch port in the selection to any other switch port in the selection, and all ports in this path should also be in the current selection. If this is not the case, 3Com Network Director will display the additional ports that need to be selected to fill in any gaps.

For example, in the network below, if the Create VLAN wizard was launched with only the switch1-switch2 link and the switch4-PC link selected, 3Com Network Director would spot the fact that there was a gap in the VLAN. So for complete connectivity, the ports connecting switch2 and switch3, and the ports connecting switch3 and switch4, should also be added to the new VLAN.