QTECH QSW-2800 Инструкция по настройке - Manual (Page 371)

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51.1.2 MRPP Protocol Packet Types
51.1.3 MRPP Protocol Operation System
1. Link Down Alarm System
When transfer node finds themselves belonging to MRPP ring port Down, it sends link Down
packet to primary node immediately. The primary node receives link down packet and
immediately releases block state of secondary port, and sends LINK-DOWN-FLUSH-FDB
packet to inform all of transfer nodes, refreshing own MAC address forward list.
2. Poll System
The primary port of primary node sends Hello packet to its neighbors timely according to
configured Hello-timer.
If the ring is health, the secondary port of primary node receives health detect packet, and the
primary node keeps secondary port.
If the ring is break, the secondary port of primary node c an’t receive health detect packet when
timer is over time. The primary releases the secondary port block state, and sends LINK-
DOWN-FLUSH_FDB packet to inform all of transfer nodes, to refresh own MAC address
forward list.
3. Ring Restore
After the primary node occur ring fail, if the secondary port receives Hello packet sending from
primary node, the ring has been restored, at the same time the primary node block its
Packet Type Explanation
Hello packet (Health examine
packet) Hello
The primary port of primary node evokes to detect ring, if
the secondary port of primary node can receive Hello
packet in configured overtime, so the ring is normal.
LINK-DOWN (link Down event
packet)
After transfer node detects Down event on port,
immediately sends LINK-DOWN packet to primary node,
and inform primary node ring to fail.
LINK-DOWN-FLUSH_FDB
packet
After primary node detects ring failure or receives LINK-
DOWN packet, open blocked secondary port, and then
uses two ports to send the packet, to inform each transfer
node to refresh own MAC address.
LINK-UP-FLUSH_FDB packet
After primary detects ring failure to restore normal, and
uses packet from primary port, and informs each transfer
node to refresh own MAC address.