Overview Of Redundancy Topologies - Hirschmann RS20 User Manual

Introduction
1.1 Overview of Redundancy
Topologies
To introduce redundancy onto layer 2 of a network, you first define which
network topology you require. Depending on the network topology selected,
you then choose from the redundancy protocols that can be used with this
network topology.
The following topologies are possible:
Network topology Possible redundancy
procedures
Tree structure Only possible in
without loops connection with
(cycle-free) physical loops
Topology with 1 RSTP
loop Ring Redundancy
Topology with 2 RSTP
loops Ring Redundancy
Sub-Ring (RSR20,
RSR30, PowerMICE,
MACH 1000 and
MACH 4000)
Topology with 3 RSTP
non-nested loops Ring Redundancy
Sub-Ring (RSR20,
RSR30, PowerMICE,
MACH 1000 and
MACH 4000)
Ring coupling
Topology with RSTP
nested loops Sub-Ring (RSR20,
RSR30, PowerMICE,
MACH 1000 and
MACH 4000)
Ring coupling
Table 1:

Overview of Redundancy Topologies

10
1.1 Overview of Redundancy
Comments
-
Ring Redundancy procedures (HIPER-Ring, Fast
HIPER-Ring or MRP) provide shorter switching
times than RSTP.
Ring redundancy: a Basis-Ring with a Sub-Ring
or an MRP-Ring with an RSTP-Ring.
The ring coupling provides particular support
when redundantly coupling a redundant ring to
another redundant ring, or to any structure that
only works with Hirschmann devices
Ring coupling only couples non-nested rings,
though these can couple local Sub-Rings.
Topologies
UM RedundConfig L2P
Release 8.0 05/2013