ZyXEL Communications IES-1248-51A, User Manual

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Chapter 13 Switch Setup
IES-1248-51V User’s Guide
108
to use standalone mode in order to use them with a network topology that uses
loops.
Standalone switch mode with port isolation enabled blocks communications
between subscriber ports on an individual IES-1248-51V. However, one IES-1248-
51V’s subscribers can communicate with another IES-1248-51V’s subscribers if
the two IES-1248-51V’s Ethernet ports are connected to each other (see
Figure 50
on page 108 for an example). If you have multiple IES-1248-51V connected on
the same network and set to standalone mode, they do not all need to have the
same port isolation setting.
13.2.2 Port Isolation with Standalone Switch Mode Example
The following graphic shows IES-1248-51V 1 and 2 connected to each other and
the Ethernet backbone switch (3) in a network topology that creates a loop. The
IES-1248-51V are using the standalone switch mode and have RSTP enabled.
In this example, both IES-1248-51V 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 50 Port Isolation with Standalone Switch Mode Example
13.2.3 Daisychain Switch Mode
Daisychain switch mode sets the IES-1248-51V 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-1248-51V. The