SNR S2940-8G-v2, Руководство по настройке

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SNR S2940-8G-v2 Switch Configuration Guide
MRPP Configuration
Each MRPP ring has two states.
Health state: The whole ring net work physical link is connected.
Break state: one or a few physical link break in ring network
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 58.1, 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 sec-
ondary 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 58.1, 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.
58.1.2 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 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 re-
ceives 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.
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