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Blocked: Ring ports drop all received frames except MRP control frames.
Forwarding: Ring ports forward all received frames.
The following are some prerequisites for proper MRP operation:
There is only one ring manager in the ring
All ring participants support MRP
Ring participants are connected to each other via the ring ports
All ring participants support the configuration time specified by the manager
8.2.2 Rapid Spanning Tree Protocol (RSTP)
MES Core FW P/N:
MES Core FW P/N:
The Spanning Tree Protocol (STP) is a network protocol that enables loop-free switching via the systematic
deactivation of redundant connections. STP allows the inclusion of redundant (spare) links to provide an
automatic backup path if an active link fails.
The Rapid Spanning Tree Protocol (RSTP) uses the same algorithm as STP for determining the tree structure.
RSTP mainly changes and adds new parameters to speed up the reconfiguration process if a link or bridge
(switch) becomes non-functional.
The 922-MES default core FW 922-1008-50 supports the Rapid Spanning Tree Protocol (RSTP) on all eight (8)
copper ports (CU1 – CU8) while also supporting MRP on SFP1-2. MES core FW 922-1008-55 supports RSTP
on all ports (SFP1-2 and CU1-8) and does not provide MRP functionality on the SFP1-2 ports. The RSTP
features included in the MES are:
Very low latency Ethernet packet switching due to hardware-based frame handling.
Hardware-based frame reception, frame filtering based on MAC table, port state and filtering database
and frame transmission.
RSTP algorithm running via embedded software implementation and direct communication to hardware
of state changes (discarding, learning or forwarding)
By default all CU1-8 copper ports on the MES have RSTP enabled. If the RSTP function is not required, this can
be changed via the Telnet interface (refer to the Telnet Commands section of this document for more details) or
via the 922 MES GUI (only available with cards with uC DIAG FW 922-1008-00 ≥ 0xA4).
RSTP global enable/disable function for all ports is available in all MES core firmware versions. RSTP per-port
ON/OFF functionality saved in EEPROM is available in core FW 922-1008-50 ≥ 0xA4 and FW 922-1008-55 ≥
0xA1.
8.2.3 HSR/PRP
The 922-MES card could be upgraded to support additional redundancy protocols such as High-availability
Seamless Redundancy (HSR) or Parallel Redundancy Protocol (PRP). Both of these protocols allow
interruption-free redundancy. Contact factory for details.
8.3 MES Core Features
The MES core support various Ethernet switch features including:
Virtual Local Area Network (VLAN)
Priority
Broadcast Storm Protection
Port Mirroring
Aging
Static MAC Table
Focal Technologies Corporation
A Moog Inc. Company
922-1008-50
CU1-8 Only
922-1008-55
SFP1-2 and CU1-8
Model 922-MES – User Manual
Document No. 922-0662-00, Rev 1.0
Page 8-3
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