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Appendix A. Rapid Ring Operation
Rapid Ring Operation
Rapid Ring is a proprietary redundancy network ring protocol. It can be used to recover the network from critical
link failure to provide fault failover protection. Many redundant or network recovery protocols are defined by
IEEE, such as spanning tree (STP, RSTP, MSTP) are available to recover the network from link failures. But the
recovery time to propagate broadcast packets to the failover port can take several seconds, depending on the
amount of network traffic. Rapid Ring recovery is less than 20ms for up to 250 switches.
Note: Only one redundant protocol can be used at the same time. Before you enable Rapid Ring, you must
disable Spanning Tree. See the Web User Guide for details on configuring Single Ring, Ring to Ring, Dual Ring, and
Rapid Chain.
Hardware Setting and Status for Rings
DIP switch settings are shown and described below. Note: RM means Ring Master, and RC means Rapid Chain.
Configure Rapid Ring by hardware DIP Switch as shown in the table below:
Mode
RM
RC
HW
OFF
OFF Single Ring Member
Control
HW
ON
OFF Single Ring Master
Control
HW
OFF
ON
Rapid Chain
Control
SW
Rapid Ring Settings
ON
ON
Control
by Software
Note:
1. Default setting of DIP Switch will be placed at ON/ON (SW Control).
2. In HW mode, all Rapid Ring and Spanning Tree SW config from Web, Telnet, and Console is "deactivated".
3. Only Single Ring and Rapid Chain are configurable by DIP Switch.
4. The largest Even/Odd ports include both fiber and copper ports. For a Combo port, either fiber or copper can
be used as the Ring connecting port.
33808 Rev. E
RM
RC
Figure 9: DIP Switch
Table 1: DIP Switch Settings
Rapid Ring Status
The largest Odd
Port Number
The largest Odd
Port Number
The largest Odd
Port Number
--
https://www.lantronix.com/
1st Port
2nd Port
The largest
Even Port
Number
The largest
Even Port
Number
The largest
Even Port
Number
--
SISGM1040-284-LRT Install Guide
RM LED
RC LED
Lit Amber
Off
Lit Green
Off
Lit Green (Active
Off
Path); Lit Amber
(Backup Path)
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