Port-Based Vlans; The Default Vlan - 3Com corebuilder 3500 Implementation Manual

Port-based VLANs

The Default VLAN

In this situation, the system removes all bridge ports from the VLAN that
it could not restore from nonvolatile (NV) data, although it does maintain
the previously stored NV data. To restore your VLANs after you see the
resource error message, use the
and then set the VLAN aware mode to taggedVlanPorts. If VLANs are
already defined, the system prompts you to reboot to put the new mode
into effect.
If you do not see the VLAN internal resource error message, maintain the
default VLAN aware mode of allPorts. In this case, the system can
accommodate the number of Release 1.2 VLANs, but it now uses
different ingress rules for tagged frames.
The Administration Console options
display the current VLAN aware mode after the VLAN mode
vlan detail
(allOpen or allClosed).
Port-based VLANs logically group together one or more bridge ports on
the system and use the generic protocol type unspecified. Each arbitrary
collection of bridge ports is designated as a VLAN interface. This VLAN
interface belongs to a given VLAN. Flooding of all frames that are
received on bridge ports in a VLAN interface is constrained to that VLAN
interface.
Your system supports the following types of port-based VLANs:
The default VLAN, a special VLAN predefined on the system
Static port-based VLANs that you create
Dynamic port-based VLANs created using GVRP
An alternative to port-based VLANs is packet filtering using port groups,
as described in Chapter 10.
The system predefines a port-based VLAN to initially include all of the
system's bridge ports without any tagging. For example, if you have four
10/100 Ethernet modules (24 bridge ports) installed on your system, the
default VLAN initially contains all 24 ports.
The default VLAN always uses the VID of 1, the name Default, and the
protocol type unspecified. No other VLAN than the default VLAN can use
a VID of 1.
Port-based VLANs
bridge vlan vlanAwareMode
bridge vlan summary
175
option
and
bridge