Hirschmann GREYHOUND GRS1020, Справочное руководство

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Redundancy
12.2 Media Redundancy Protocol (MRP)
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UM Config GRS
Release 8.0 09/2019
12.2 Media Redundancy Protocol (MRP)
Since May 2008, the Media Redundancy Protocol (MRP) has been a standardized solution for ring
redundancy in the industrial environment.
MRP is compatible with redundant ring coupling, supports VLANs, and is distinguished by very
short reconfiguration times.
An MRP-Ring consists of up to 50 devices that support the MRP protocol according to IEC 62439.
When you only use Hirschmann devices, up to 100 devices are possible in the MRP-Ring.
When you use the fixed MRP redundant port (Fixed Backup) and the primary ring link fails, the Ring
Manager forwards data to the secondary ring link. When the primary link is restored, the secondary
link continues to be in use.
12.2.1 Network Structure
The concept of ring redundancy lets you construct high-availability ring-shaped network structures.
With the help of the RM ( R ing M anager) function, the two ends of a backbone in a line structure can
be closed to a redundant ring. The Ring Manager keeps the redundant line open as long as the line
structure is intact. When a segment becomes inoperable, the Ring Manager immediately closes the
redundant line, and line structure is intact again.
Figure 28: Line structure
Figure 29: Redundant ring structure
RM = Ring Manager
—— main line
- - - redundant line
RM