ZyXEL Communications MES3500 series User Manual page 81

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
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
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.
Note: The uplink port connected to the Internet should be the root port. Otherwise, with
smart isolation enabled, the isolated ports cannot access the Internet.
Chapter 8 Basic Setting
C
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MES3500 Series User's Guide
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