Transition Networks
SGFEB 10/100/1000 Bridging Media Converter User Guide
33601 Rev. D
Page 14 of 25
Port Isolation
The SGFEB -230 and -330 support Port Isolation. This function uses Port Isolation (Port Based VLAN) to
disable the data paths between ports. This allows two customer-facing fiber ports and prevents each
customer from seeing the other’s traffic.
The Port Isolation (Port Based VLAN) feature creates a PVLAN (Private Virtual Local Area Network), but
it does not use 802.1Q tags. The current Port Based VLAN implementation only forwards traffic to ports in
a specific port’s VLAN Table. Tagged and untagged traffic will move through the SGFEB unmodified.
Port isolation setup varies between models as shown and described below.
Port Isolation on 3-Port Models
Port Isolation on 3-port devices sets up a port-based VLAN between the TP port and each Fiber port as
shown below.
Port
Ports Traffic Forwarded To (VLAN Table)
1 (Fiber)
3
2 (Fiber)
3
3 (TP)
1,2
