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2-2 CHAPTER 2: VLANS ON THE LANPLEX® SYSTEM
the data contained in the frames. Port groups are useful when traffic
patterns are known to be directly associated with particular ports. They can
benefit the user by restricting traffic based on a set of simple rules.
MAC Address Group VLANS
VLANs allow a switch to make filtering decisions based on grouping MAC
addresses together. These MAC address groups can be configured so that
stations in the group can only communicate with each other or with
specific network resources. This solution is good for security. It allows the
VLAN association to move with the station. However,
MAC-address-grouped VLANs may require complex configuration in
comparison to other types of VLANs.
Port group and MAC address group VLANs are supported using the packet
filtering capabilities in the LANplex system. For information on port group
and MAC address group filtering, refer to your LANplex Operation Guide and
LANplex Administration Console User Guide.
Application-Oriented VLANS
Using the LANplex filtering capability, application-specific traffic such as
telnet traffic or FTP traffic can be filtered based on higher-layer information.
You create this application-oriented VLAN by configuring packet filters that
specify data and offsets of the data within received packets. For example, to
use a filter on a particular port for all telnet traffic, create a a filter that
discards all TCP traffic received on the telnet port.
IP multicast routing and autocast VLANs are additional VLAN features in the
LANplex that can be used to group IP multicast traffic for specific
applications. For more information on how the LANplex system manages IP
Multicast traffic, see Chapter 8.
Protocol-Sensitive VLANS
When the LANplex system receives data that has a broadcast, multicast, or
unknown destination address, it forwards the data to all ports. This process
is referred to as bridge flooding.
Protocol-sensitive VLANs group one or more switch ports together for a
specified network layer 3 protocol, such as IP or AppleTalk. These VLANs
make flooding decisions based on the network layer protocol of the frame.
In addition, for IP VLANs, you can also make flooding decisions based on