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Example 4, Isolating Network Traffic According to Protocol
802.1Q VLAN User’s Guide 4-21
5. The AppleTalk frames must now be restricted to Ports 2 through 8 of
the Yellow VLAN. On the Protocol Ports Configuration screen, All
ports except Port 1 are assigned to the AppleTalk protocol, as follows:
• Port 2, VLAN ID: 6, Protocol: AppleTalk
• Port 3, VLAN ID: 6, Protocol: AppleTalk
• Port 4, VLAN ID: 6, Protocol: AppleTalk
• Port 5, VLAN ID: 6, Protocol: AppleTalk
• Port 6, VLAN ID: 6, Protocol: AppleTalk
• Port 7, VLAN ID: 6, Protocol: AppleTalk
• Port 8, VLAN ID: 6, Protocol: AppleTalk
Any AppleTalk frame received on ports 2 through 8 will be broadcast
to all other ports on Switch 5 associated with the AppleTalk protocol.
For example, if Port 2 received a frame with the AppleTalk protocol,
Switch 5 would only transmit the frame to Ports 2, 3, 4, 6, 7, and 8.
6. Use the VLAN Forwarding Configuration screen to assign Port 1 to
the Yellow VLAN and set the frame type to tagged. With this
configuration, the frames transmitted on Port 1 are tagged as being
from the Yellow VLAN.
If a frame associated with any protocol other than AppleTalk (for
example, for the mail server) is received on any of the Ports 2 through
8, the frame would be part of the Yellow VLAN and transmitted out
Port 1 as a tagged frame to Switch 3 and handled in the same manner
as previously described in the previous examples to route the frame to
the Mail Server on the first floor.
Any unicast frames received via Port 1 that are destined for a device
in the Yellow VLAN are transmitted to the correct device. Any
broadcast frames received via Port 1 are transmitted to all the devices
in the Yellow VLAN and handled in a similar manner as previously
described in Example 2.