User's Manual

Configuration Guide of XGS-5240-Series
62-3
62.1.3 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 pa
cket and immediately releases block state of secondary port, and sends LINK-DOWN-F
LUSH-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 accord
ing to configured Hello-timer.
If the ring is health, the secondary port of primary node receives health detect pac
ket, and the primary node keeps secondary port.
If the ring is break, the secondary port of primary node can’t receive health detect
packet when timer is over time. The primary releases the secondary port block state, a
nd sends LINK-DOWN-FLUSH_FDB packet to inform all of transfer nodes, to refresh o
wn MAC address forward list.
3. Ring Restore
Packet Type
Explanation
Hello packet (Health examine pack
et) Hello
The primary port of primary node evokes to detec
t ring, if the secondary port of primary node can r
eceive Hello packet in configured overtime, so the
ring is normal.
LINK-DOWN (link Down event pac
ket)
After transfer node detects Down event on port, i
mmediately 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 por
t, and then uses two ports to send the packet, to
inform each transfer node to refresh own MAC a
ddress.
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.