Overview Of Redundancy Topologies - Hirschmann RS20 User Manual

Introduction
1.1 Overview of Redundancy
Topologies
To introduce redundancy onto layer 2 of a network, first clarify 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
Topology with 3 RSTP
non-nested loops Ring Redundancy
Ring coupling
Table 1: Overview of Redundancy Topologies
The Ring Redundancy Protocol MRP has particular properties to offer:

You have the option of coupling to MRP-Rings other ring structures that
work with RSTP
10
Comments
-
Ring Redundancy procedures (HIPER-Ring, Fast
HIPER-Ring or MRP) provide shorter switching
times than RSTP.
Ring redundancy: 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
(see on page 87 "Combining RSTP and
1.1 Overview of Redundancy
MRP").
UM Redundancy Configuration L2E
Release 7.1 12/2011
Topologies