Switch Management and Operating Concepts
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Protocol-based VLANs (PBVLANs)
The main purpose of Protocol-based VLANs (PBVLANs) is to selectively process packets based on
their upper-layer protocol by setting up protocol-based filters. Packets are bridged through user-
specified ports based on their protocol.
In PBVLANs, the VLAN classification of a packet is based on its protocol (IP, IPX, etc.).
PBVLANs help optimize network traffic because protocol-specific broadcast messages are sent only
to end stations using that protocol. End stations do not receive unnecessary traffic and bandwidth is
used more efficiently. It is a flexible method that provides a logical grouping of users. An IP subnet
or an IPX network, for example, can each be assigned its own VLAN.
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.
To configure PBVLAN support perform the following steps:
•
Create and name a group.
•
Assign one or more of the protocols – IP, IPX or ARP – to the group.
•
Assign a VID to it.
•
Specify the port(s) to which it applies.
If a tagged packet is received on a port in a PBVLAN group it will be processed using normal IEEE
802.1Q rules. If an untagged or priority-tagged packet is received, and the port is a member of a
group with the matching protocol, the packet will be assigned the group’s VID, otherwise it will be
dropped. If no VID has been configured for the group, the PVID will be used
.
Static MAC filtering
Static MAC Filtering allows you to add a small number (in the order of hundreds) of unicast or
multicast MAC addresses directly to the forwarding database. Associated with each Static MAC
address is a set of destination ports and VLAN information.
Any packet with a particular Static MAC Address in a particular VLAN is admitted only if the
ingress port is in the set of source ports, otherwise the packet is dropped. On the egress side the
packet, if admitted, is sent out of all the ports that are in the set of destination ports.
Upon ingress, each packet's destination MAC address is compared against the forwarding database.
If the address is not in the table, the packet is flooded within the VLAN. If the address is in the table,
then it is checked to see if it has been defined as a filter. If the MAC address is not defined as a filter,
forwarding is performed as a normal parced address.
If the specific destination MAC address is defined as a filter, the packet is forwarded to the set of
destination ports defined in the filter.
Static entries are never aged and can only be removed by user command.
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