Redundancy
12.1
Network Topology vs. Redundancy Protocols
148
UM Config GRS
Release
8.0
09/2019
12 Redundancy
12.1
Network Topology vs. Redundancy Protocols
When using Ethernet, a significant prerequisite is that data packets follow a single (unique) path
from the sender to the receiver. The following network topologies support this prerequisite:
Line topology
Star topology
Tree topology
Figure 25: Network with line, star and tree topologies
To maintain communication in case a connection fails, install additional physical connections
between the network nodes. Redundancy protocols help ensure that the additional connections
remain switched off while the original connection is still working. When the connection fails, the
redundancy protocol generates a new path from the sender to the receiver via the alternative
connection.
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.
12.1.1
Network topologies
Meshed topology
For networks with star or tree topologies, redundancy procedures are only possible in connection
with physical loop creation. The result is a meshed topology.
Figure 26: Meshed topology: Tree topology with physical loops
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