Cabletron Systems 802.1Q VLAN, User Manual, Page: 83 / 92

Example 4, Isolating Network Traffic According to Protocol
802.1Q VLAN User’s Guide 4-17
4.4 EXAMPLE 4, ISOLATING NETWORK TRAFFIC
ACCORDING TO PROTOCOL
This final example illustrates how to restrict AppleTalk protocol traffic of
a network to prevent unwanted multicast frames from slowing down the
whole network and yet be able to send and receive frames associated with
other protocols.
In this example, illustrated in Figure 4-7 , the Publications Department is
relocating from another site to the third floor. This network will consist of
six computers and a printer using several protocols including the
AppleTalk protocol. A characteristic of the AppleTalk protocol is to send
all frames as multicast frames. These multicast frames will be isolated to
a VLAN (Grey VLAN) to prevent them from slowing down the other
networks.
A second VLAN (Yellow VLAN) will be established to handle traffic of
other protocols. The Publications Department users will have access to
the mail server on the first floor along with the Red, Blue, and Green
VLANs.