ZyXEL XGS-4528F User Guide - Page 107

Chapter 8 Basic Setting 8.4.1 Smart Isolation To block traffic between two specific ports within the Switch, you can use port isolation or private VLAN (see Chapter 33 on page 315 for more information). However, it does not work across multiple switches. For example, broadcast traffic from isolated ports on a switch (say B) can be forwarded to all ports on other switches (A and C), including the isolated ports. A B Isolated ports: 2~6 Root port: 7 Designated port: 8 C Smart isolation allows you to prevent isolated ports on different switches from transmitting traffic to each other. After you enable RSTP/MRSTP and smart isolation on the Switch, the designated port(s) will be added to the isolated port list. In the following example, switch A is the root bridge. Switch B's root port 7 connects to switch A and switch B's designated port 8 connects to switch C. Traffic from isolated ports on switch B can only be sent through non-isolated port 1 or root port 7 to switch A. This prevents isolated ports on switch B sending traffic through designated port 8 to switch C. Traffic received on designated port 8 from switch C will not be forwarded to any other isolated ports on switch B. A B Before Smart Isolation: Isolated ports: 2~6 Root port: 7 Designated port: 8 After Smart Isolation: Isolated ports: 2~6, 8 C Root port: 7 Designated port: 8 You should enable RSTP or MRSTP before you can use smart isolation on the Switch. If the network topology changes, the Switch automatically updates the isolated port list with the latest designated port information. XGS-4526/4528F/4728F User's Guide 107