3com S7906E Instruccion De Instalación

 

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RRPPDUs of subrings are transmitted as data packets in the primary ring, while RRPPDUs of the 

primary ring can only be transmitted within the primary ring.  

 

When RRPP checks the link state of an Ethernet ring, the master node sends Hello packets out the 

primary port according to the Hello timer and determines whether its secondary port receives the Hello 

packets based on the Fail timer.  

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The Hello timer specifies the interval at which the master node sends Hello packets out the primary 

port.  

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The Fail timer specifies the maximum delay between the master node sending Hello packets out 

the primary port and the secondary port receiving the Hello packets from the primary port. If the 

secondary port receives the Hello packets sent by the local master node before the Fail timer 

expires, the overall ring is in Health state. Otherwise, the ring transits into Disconnect state.  

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The Fast-Hello timer specifies the interval at which the master node sends Fast-Hello packets out 

the primary port.  

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The Fast-Fail timer specifies the maximum delay between the master node sending Fast-Hello 

packets out the primary port and the secondary port receiving the Fast-Hello packets from the 

primary port. If the secondary port receives the Fast-Hello packets sent by the local master node 

before the Fast-Fail timer expires, the entire ring is in Health state. Otherwise, the ring transits into 

Disconnect state.  

 

In an RRPP domain, a transit node learns the Hello timer value and the Fail timer value on the master 

node through the received Hello packets, ensuring that all nodes in the ring network are consistent in 

the two timer settings. A transit node, however, cannot learn the Fast-Hello timer value and the 

Fast-Fail timer value set on the master node through received Fast-Hello packets. 

 

The polling mechanism is used by the master node of an RRPP ring to check the Health state of the ring 

network. 

The master node sends Hello packets out its primary port periodically, and these Hello packets travel 

through each transit node on the ring in turn.  

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If the ring is complete, the secondary port of the master node will receive Hello packets before the 

Fail timer expires and the master node will keep the secondary port blocked.