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Switch Overview SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide
RI/RO-Like Connection on SmartStack STS16-20R
A UTP RI/RO connection is available on ports 19 and 20 on the SmartStack
STS16-20R Switch.
This feature allows the SmartStack STS16-20R to connect to CAU/LAM systems
using the RI/RO connections thus providing a RI/RO-like functionality. This
enables the switch to be easily installed in existing Token Ring networks.
A loop-back function has been implemented on these ports so that if the port is
disabled or the switch is powered off there will not be a break in the attached main
ring. This means that attaching a cable from the RI port of a MAU port to one of
the two switch ports in effect joins the primary and the backup ring in a MAU/CAU
main ring system. Connecting the other end of the RI/RO connection to the other
switch port,
creates redundant paths
because the two switch ports are connected to
the same segment.
Therefore, the IEEE Spanning Tree Protocol (STP) must be
enabled
, which will place one port in forward and the other in blocked mode. If
there is a break in the main ring, the STP will place both ports in forward mode, and
all MACs on both segments will be relearned.
If a SmartStack STS16-20R port has been configured to RI/RO mode, it will
automatically sense whether the port has been connected to RI or RO of the MAU.
Note:
It is not possible to automatically verify whether a UTP/STP port has been
connected according to the configuration. Any errors, such as attaching port 19 or
20 to a normal MAU port when the SmartStack STS16-20R port has been
configured for RI/RO, will cause a complete disruption of the ring to which the port
is attached. Therefore, be careful when using the RI/RO feature.