HMG-838PT & HMG-838EPT Web Configuration 7-1
Chapter 7
Redundancy
Designing redundant paths that can protect networks from unexpected failovers is extremely important in
mission-critical networks that need to provide uninterrupted services. However, redundant paths mean that possible
loops may occur in networks and bring down networks eventually if they are not treated carefully. In practice, several
loop protection methods are implemented to ensure that networks function normally without loops and recover as soon
as possible when a point of failure occurs. The most popular ones are STP (802.1d), RSTP (802.1w) and MSTP
(802.1s). For industrial applications, the proprietary Direct-Ring and ERPS (G.8032) are highly recommended since
they can achieve faster recovery time than any STP protocol.
In this section, the redundancy-related functions will be introduced individually. The functions covered in this section
can be seen from the “Redundancy” menu.
7-1 Direct-Ring
Direct-Ring is a proprietary redundancy technology that supports 250 units in a ring topology and can bring redundant
paths into service within 10ms when link failures occur. Compared with spanning tree protocol, Direct-Ring achieves
faster recovery time on the network and is more flexible and scalable in network architecture. Direct-Ring redundancy
technology can automatically self identifies the ring Master (the user-defined Master is also supported) and then block a
port resided in Master device for backup purposes. Once the disconnection is detected on the network, Direct-Ring can
bring backup ports back into “forwarding” mode so that the disconnected path can keep contact with the whole network.
7-1.1 Configuration
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