ZyXEL Communications IES-612-51A User Manual

Chapter 10 Switch Setup

IES-612-51A User’s Guide

The following graphic shows IES-612-51A 1 and 2 connected to each other and the Ethernet 
backbone switch (3) in a network topology that creates a loop. The IES-612-51A are using the 
standalone switch mode and have RSTP enabled. 

In this example, both IES-612-51A have port isolation turned on. Communications between A 
and B must first go through another switch (3 in the figure). However, A and B can 
communicate with C without their communications going through another switch or router.

Figure 41   Port Isolation with Standalone Switch Mode Example

Daisychain switch mode sets the IES-612-51A to use Ethernet port one (ENET 1) as an uplink 
port to connect to the Ethernet backbone and Ethernet port two (ENET 2) to connect to another 
(daisychained or subtending) IES-612-51A. The daisychain switch mode is recommended for 
use in a network topology that does not have loops. When you daisychain multiple IES-612-
51A they must all be set to daisychain mode.

Daisychain switch mode with port isolation enabled blocks communications between 
subscriber ports on an individual IES-612-51A and between the subscribers of any 
daisychained IES-612-51A (see 

 for an example). Use the same port 

isolation setting on all IES-612-51A that you set up in a daisychain.

In the example below, the IES-612-51A 1 has its Ethernet port one (ENET 1) connected to the 
Ethernet backbone switch (3) and it’s Ethernet port two (ENET2) connected to Ethernet port 
one (ENET 1) of the daisychained IES-612-51A (2).