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C-2 APPENDIX C: VLANS ON THE COREBUILDER SYSTEM
Port Group VLANs
Port group VLANs group together one or more switch ports. This simple
implementation of VLANs requires little configuration. All frames
received on a port are grouped together. For example, all frames
received on a port that is part of a port group are kept within that port
group, regardless of 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 CoreBuilder system. For information on port group
and MAC address group filtering, refer to your CoreBuilder 6000 Operation
Guide and CoreBuilder 6000 Administration Console User Guide.
Application-Oriented VLANS
Using the CoreBuilder 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 filter that discards all TCP traffic received on the telnet
port.
IP multicast routing and autocast VLANs are additional VLAN features in the
CoreBuilder that can be used to group IP multicast traffic for specific
applications.