Westermo U200 Operator manal - Manual (Page 21)

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The communication media between the two FRNT version 0 rings may not be under direct
control of the switches at either end. Thus any type of commutation technologies can be used
on the primary and a backup links.
Failure of the either the primary or the backup links will cause the primary or backup switch to
raise an alarm via SNMP, activate the fault contact and start switch LED blinking.
A FRNT version 1 topology change (link loss or link establishment on the primary and a
backup link) will also trig a MAC table on some or all switches in the FRNT 0 rings. The re-
configuration time in case of is FRNT version 1 topology change is comparable to the FRNT
version 0 re-configuration time.
Figure 11, FRNT version 1, multiple ring topology
7.3.2 FRNT version 1, configuration rules
The rules are as follows:
•
Only two switches in a FRNT version 0 ring can be configured for FRNT version 1,
one as primary
•
Only one port can be enabled for FRNT version 1