SNR S2989G-48TX-DC — руководство по эксплуатации: Конфигурация надежности сети [414/553]

S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-15

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.

7.2.1.3 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