Westermo PMI-110-F2G - Manual (Page 80)

selected to be Ring Ports. For Ring Master, one of the ring ports will become the
forwarding port and the other one will become the blocking port.
Path Cost: Change the Path Cost of Ring Port1. If this switch is the Ring Master of
a Ring, then it determines the blocking port. The Port with higher Path Cost in the
two ring ports will become the blocking port, If the Path Cost is the same, the
port with larger port number will become the blocking port.
Ring Port2: Assign another port for ring connection
Path Cost: Change the Path Cost of Ring Port2
Rapid Dual Homing: Rapid Dual Homing is an important feature of the Ring
redundancy technology. When you want to connect multiple RSR or form
redundant topology with other vendors,RDH could allow you to have maximum 7
multiple links for redundancy without any problem.
In Dual Homing you have to configure additional port as Dual Homing port to
two uplink switches. In Rapid Dual Homing, you don’t need to configure specific
port to connect to other protocol. The Rapid Dual Homing will smartly choose the
fastest link for primary link and block all the other link to avoid loop. If the
primary link failed, Rapid Dual Homing will automatically forward the secondary
link for network redundant. Of course, if there are more connections, they will be
standby links and recover one of then if both primary and secondary links are
broken.
Ring status: To enable/disable the Ring. Please remember to enable the ring after
you add it.
MultiRing: The MultiRing technology is one of the patterns of the MSR
technology; it allows you to aggregate multiple rings within one switch. Create
multiple ring ID and assign different ring port 1 and port 2 to each ring, thus the
switch can have multiple rings in one PMI Switch.
When implementing MultiRing, remember that the different rings can NOT use
the same ring ID. The other settings are the same as above description.
Technically, the maximum ring volume the MultiRing supported is up to 16 rings.
Due the limited number of ports, the number of ring network is the half of port
number.
TrunkRing: The MultiRing technology is part of the MSR technology which
combines the MSR with the port trunking technology. After multiple ports
aggregated, this is so‐call port trunking (Staticly or learnt by LACP protocol), the
Trunk ID can be one of the port ID of the MSR technology. Configured the port
trunking first then you can add the Trunk group as a Ring Port in managed switch.
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