Application-Oriented Vlans; Mac Address Group Vlans; Port Group Vlans - 3Com CoreBuilder 2500 User Manual

2-2 C 2: VLAN C B 2500 S
HAPTER S ON THE ORE UILDER YSTEM

Port Group VLANs

Port group VLANs, which connect one or more switch ports, require little
configuration. Port groups are useful when traffic patterns are directly
associated with particular ports. Port groups can benefit the network by
restricting traffic based on a set of simple rules.
A port group VLAN groups all frames received on a port and keeps the
frames within that port group, regardless of the data contained in the
frames.

MAC Address Group VLANs

In a MAC address group VLAN, a switch filters by MAC addresses. This
type of VLAN is very secure because you can configure these MAC
address groups so that stations in the group can communicate only with
each other or with specific network resources.
This type of VLAN is also easy to maintain because a VLAN association
moves when a station moves. However, MAC address group VLANs may
require complex configuration in comparison to other types of VLANs.

Application-Oriented VLANs

Using the CoreBuilder 2500 filtering capability, a switch can filter
application-specific traffic such as telnet traffic or FTP traffic based on
higher-layer information. To create this application-oriented VLAN, you
configure 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 that is received on
the telnet port.
You can also use IP multicast routing and autocast VLANs to group IP
multicast traffic for specific applications.