SNR S2989G-48TX-POE — настройка надежности Ethernet: Основные узлы и порты [413/553]

Превью страниц Страница 413 / 553

S2989G-24TX Operation Manual

Chapter 7 Reliability Configuration

7-14

3. nodes

Each switch is named after a node on Ethernet. The node has some types:

Primary node: each ring has a primary node, it is main node to detect and defend.

Transfer node: except for primary node, other nodes are transfer nodes on each ring.

The node role is determined by user configuration. As shown Fig 3-1, Switch A is primary

node of Ring 1, Switch B. Switch C; Switch D and Switch E are transfer nodes of Ring 1.

4. Primary port and secondary port

The primary node and transfer node have two ports connecting to Ethernet

separately, one is primary port, and another is secondary port. The role of port is

determined by user configuration.

Primary port and secondary port of primary node.

The primary port of primary node is used to send ring health examine packet (hello),

the secondary port is used to receive Hello packet sending from primary node. When the

Ethernet is in health state, the secondary port of primary node blocks other data in logical

and only MRPP packet can pass. When the Ethernet is in break state, the secondary port

of primary node releases block state, and forwards data packets.

There are no difference on function between Primary port and secondary port of

transfer node.

The role of port is determined by user configuration. As shown Fig 3-1, Switch A E1 is

primary port, E2 is secondary port.

5. Timer

The two timers are used when the primary node sends and receives MRPP protocol

packet: Hello timer and Fail Timer.

Hello timer: define timer of time interval of health examine packet sending by primary

node primary port.

Fail timer: define timer of overtime interval of health examine packet receiving by

primary node primary port. The value of Fail timer must be more than or equal to the 3

times of value of Hello timer.

7.2.1.2 MRPP Protocol Packet Types

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