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from nonRM to RM or from RM to nonRM.
Role state Transition Count: This number means how many times the Ring status has
been transformed between Normal and Abnormal state.
4.4.9
Loop Protection
Since the 2.6 firmware version, The
Switch supports loop eliminate
function that based on per port or
system configure, and prevents any
looping caused by RSTP and MSR
ring. The following figure shows the
Loop Protect configuration.
Transmit interval: setting the detect duration time between detect packet.
Loop Protection: Enable/ Disable Loop Preotection function by per port.
Status: shows the port status. If there is looping occurred, it will show “Loop Detected
and Disabled” information and the link indicator will not turn-off, and also the port is
disabled by system. Once the looping is fixed, the blocked port will keep at blocked
state, and must be enabled by manual or perform system reset to recovery it.
Reload: refresh and update the port status information.
4.4.10 ERPS Configuration
The ERPS (Ethernet Ring Protection Switching) is a
protection switching mechanisms and a protocol for
Ethernet layer network (ETH) rings. Ethernet Rings can
provide wide-area multipoint connectivity more
economically due to their reduced number of links. The
mechanisms and protocol defined in this
Recommendation achieve highly reliable and stable
protection; and never form loops, which would fatally
affect network operation and service availability. The
ERPS is an effort of ITU-T, under G8032
Recommendation to provide sub-50ms protection and
recovery switching for Ethernet traffic in a ring
topology and at the same time ensuring that there are
no loops formed at the Ethernet layer. The ITU-T G.8032 v1 supported a single ring
topology, and ITU-T G.8032 v2 supports multiple rings with ladder topology.
In currently, the JetNet Switch only supports ITU-T G.8032 v1 with single ring topology.
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