Manual

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Москва, Новозаводская ул., 18, стр. 1
398
53.1.3 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 can’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
secondary port, and sends its neighbor LINK-UP-Flush-FDB packet.
After MRPP ring port refresh UP on transfer node, the primary node maybe find ring restore
after a while. For the normal data VLAN, the network maybe forms a temporary ring and
creates broadcast storm. To avoid temporary ring, transfer node finds it to connect to ring
network port to refresh UP, immediately block temporarily (only permit control VLAN packet
pass), after only receiving LINK-UP-FLUSH-FDB packet from primary node, and releases the
port block state.
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.