Ethernet Switch User Manual
Manual_cmd_line_config-ESML6-P3-Rev1106
Copyright © KBC Networks Ltd.
Page 28 of 49
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Master
Slave
Slave
Slave
Figure 9-1 DT-Ring topology
Note:
Each switch in a same ring should have same domain ID.
The domain name should be the same for each switch in the ring to ensure easy
maintenance.
There can only be one master switch in one ring the others must be all set as slaves.
DT-Ring ensures fast recovery, however the time delay still exists. The time delay can be
figured out by the formula:
Max recovery time = (Quantity of the switches in the ring x 2.5 + 10) ms
The following should be taken into consideration when looking at the quantity of switches
being connected in one ring:
Network throughput
– the data flow increases when the quantity of the switches
increases therefore the data flow should be kept to less than the network throughput.
Recover time
- the recovery time is related to the quantity of switches in one ring, this
will therefore increase with an increase in the number of switches.
Protection efficiency
- DT-Ring can achieve 1: N protection, this means that one unit
can protect other N units. If N is too large, then the protection efficiency will be reduced.
Maintenance
- too many switches in one ring will cause difficulties with maintenance.
