Lantronix
SISGM1040-284-LRT Install Guide
33808 Rev. E
43
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.
Figure 9: DIP Switch
Configure Rapid Ring by hardware DIP Switch as shown in the table below:
Table 1: DIP Switch Settings
Mode RM RC
Rapid Ring Status
1st Port
2nd Port
RM LED
RC LED
HW
Control OFF OFF Single Ring Member
The largest Odd
Port Number
The largest
Even Port
Number
Lit Amber Off
HW
Control ON OFF Single Ring Master
The largest Odd
Port Number
The largest
Even Port
Number
Lit Green
Off
HW
Control OFF ON Rapid Chain
The largest Odd
Port Number
The largest
Even Port
Number
Off
Lit Green (Active
Path); Lit Amber
(Backup Path)
SW
Control ON ON
Rapid Ring Settings
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.
O N
1
2
RM
RC