HP 445946-001 User Manual download pdf (Page 58)

VLANs

Figure 7 802.1Q tagging (after 802.1Q tag assignment)

NOTE: Using the /boot/conf factory command resets all ports to VLAN 1 (except

management port 17) and all other settings to the factory defaults at the next reboot.

VLANs and IP interfaces

Carefully consider how you create VLANs within the switch, so that communication with the switch

remains possible. In order to access the switch for remote configuration, trap messages, and other

management functions, be sure that at least one IP interface on the switch has a VLAN defined.

You can also inadvertently cut off access to management functions if you exclude the ports from the VLAN

membership. For example, if all IP interfaces are left on VLAN 1 (the default), and all ports are configured

for VLAN 2, and then switch management features are effectively cut off.

To remedy this, keep all ports used for remote switch management on the default VLAN and assign an IP

interface to the default VLAN.

For more information on configuring IP interfaces, see the “Configuring an IP interface” section in the

“Accessing the switch” chapter.

VLAN topologies and design considerations

By default, all switch ports are configured to the default VLAN 1. This configuration groups all ports into

the same broadcast domain. The VLAN has an 802.1Q VLAN ID of 1. VLAN tagging is turned off,

because, by default, all ports are members of a single VLAN only.

If configuring Spanning Tree Protocol (/cfg/l2/stp), note that each of spanning tree groups 2-128

may contain only one VLAN. If configuring Multiple Spanning Tree Protocol (/cfg/l2/mrst), each of

the spanning tree groups (1-32 for MSTP) may contain multiple VLANs.

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HP 445946-001 User Manual Page 58