Dell Networking 7048, Reference Manual

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VLAN Commands
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its own VLAN. Additionally, protocol-based classification allows an
administrator to assign nonrouting protocols, such as NetBIOS or DECnet, to
larger VLANs than routing protocols like IPX or IP. This maximizes the
efficiency gains that are possible with VLANs.
In port-based VLAN classification, the Port VLAN Identifier (PVID) is
associated with the physical ports. The VLAN ID (VID) for an untagged
packet is equal to the PVID of the port. In port-and protocol-based VLAN
classifications, multiple VIDs are associated with each of the physical ports.
Each VID is also associated with a protocol. The ingress rules used to classify
incoming packets include the use of the packet's protocol, in addition to the
PVID, to determine the VLAN to which the packet belongs. This approach
requires one VID on each port for each protocol for which the filter is desired.
IP Subnet Based VLANs
This feature allows an untagged packet to be placed in a configured VLAN
based upon its IP address.
MAC-Based VLANs
This feature allows an untagged packet to be placed in a configured VLAN
based upon its MAC address.
Private VLAN Commands
The PowerConnect Private VLAN feature separates a regular VLAN domain
into two or more sub-domains. Each sub-domain is defined (represented) by
a primary VLAN and a secondary VLAN. The primary VLAN ID is the same
for all sub-domains that belong to a private VLAN. The secondary VLAN ID
differentiates sub-domains from each another and provides Layer 2 isolation
between ports of the same private VLAN. There are the following types of
VLANs within a private VLAN:
• Primary VLAN
Forwards the traffic from the promiscuous ports to isolated ports,
community ports and other promiscuous ports in the same private VLAN.
Only one primary VLAN can be configured per private VLAN. All ports
within a private VLAN share the same primary VLAN.
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