QTECH QSW-2800 Инструкция по настройке - Manual (Page 376)

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51.4 MRPP Troubleshooting
The normal operation of MRPP protocol depends on normal configuration of each switch on
MRPP ring, otherwise it is very possible to form ring and broadcast storm:
Configuring MRPP ring, you’d better disconnected the ring, and wait for each switch
configuration, then open the ring.
When the MRPP ring of enabled switch is disabled on MRPP ring, it ensures the ring of the
MRPP ring has been disconnected.
When there is broadcast storm on MRPP ring, it disconnects the ring firstly, and ensures if
each switch MRPP ring configuration on the ring is correct or not; if correct, restores the ring,
and then observes the ring is normal or not.
The convergence time of MRPP ring net is relative to the response mode of up/down. If use
poll mode, the convergence time as hundreds of milliseconds in simple ring net, if use interrupt
mode, the convergence time within 50 milliseconds.
Generally, the port is configured as poll mode, interrupt mode is only applied to better
performance environment, but the security of poll mode is better than interrupt mode, port-
scan-mode {interrupt | poll} command can be consulted.
In normal configuration, it still forms ring broadcast storm or ring block, please open debug
function of primary node MRPP, and used show MRPP statistics command to observe states
of primary node and transfer node and statistics information is normal or not, and then sends
results to our Technology Service Center.