User`s manual

TN-5516/5518 Series Featured Functions
3-22
Initial setup for Turbo Ring or Turbo Ring V2
1. For each switch in the ring, select any two ports
as the redundant ports.
2. Connect redundant ports on neighboring
switches to form the redundant ring.
The user does not need to manually assign the master with Turbo Ring or Turbo Ring V2. If no switch is
assigned as the master, the protocol automatically selects one of the switches to be the master. The master is
only used to identify which segment in the redundant ring acts as the backup path. In the following subsections,
we explain how the redundant path is selected for rings configured for Turbo Ring and Turbo Ring V2.
Determining the Redundant Path for Turbo Ring
In this case, the redundant segment (i.e., the segment that will be blocked during normal operation) is
determined by the number of TN series Ethernet switches in the ring and by the location of the master switch.
Turbo Ring with even number of switches
Master
If the number of Ethernet switches in the Turbo Ring
is 2N (an even number), the backup segment is one
of the two segments connected to the (N+1) st switch
(i.e., the unit directly opposite the master).
Turbo Ring with odd number switches
Segment N+1
Master
If the number of Ethernet switches in the Turbo Ring
is 2N+1 (an odd number), the backup segment
is the
(N+1) st segment counting counterclockwise.
For the example shown here, N=1, so that N+1=2.