H3C S5120-EI Series Configuration Manual

Also see for S5120-EI Series: Configuration guide Installation manual Configuration guide Configuration guide Operation manual

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H3C S5120-EI Series Configuration Manual Manual pdf 64 page image

55Type DescriptionCommon-Flush-FDBThe master node initiates Common-Flush-FDB packets to instruct the transit nodesto update their own MAC entries and ARP/ND entries when an RRPP ring transitsto Disconnect state. FDB stands for Forwarding Database.Complete-Flush-FDBThe master node initiates Complete-Flush-FDB packets to instruct the transit nodesto update their own MAC entries and ARP/ND entries and release blocked portsfrom being blocked temporarily when an RRPP ring transits to Health state.Edge-Hello The edge node initiates Edge-Hello packets to examine the SRPTs between theedge node and the assistant-edge node.Major-FaultThe assistant-edge node initiates Major-Fault packets to notify the edge node ofSRPT failure when an SRPT between edge node and assistant-edge node is torndown.NOTE:RRPPDUs of subrings are transmitted as data packets in the primary ring, and RRPPDUs of the primaryring can only be transmitted within the primary ring.RRPP timersWhen RRPP checks the link state of an Ethernet ring, the master node sends Hello packets out of theprimary port according to the Hello timer and determines whether its secondary port receives the Hellopackets based on the Fail timer.• The Hello timer specifies the interval at which the master node sends Hello packets out of theprimary port.• The Fail timer specifies the maximum delay between the master node sending Hello packets out ofthe primary port and the secondary port receiving the Hello packets from the primary port. If thesecondary 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 the Disconnect state.NOTE:In an RRPP domain, a transit node learns the Hello timer value and the Fail timer value on the master nodethrough the received Hello packets, ensuring that all nodes in the ring network are consistent in the twotimer settings.How RRPP worksPolling mechanismThe polling mechanism is used by the master node of an RRPP ring to check the Health state of the ringnetwork.The master node periodically sends Hello packets out of its primary port, and these Hello packets travelthrough each transit node on the ring in turn:• If the ring is complete, the secondary port of the master node will receive Hello packets before theFail timer expires and the master node will keep the secondary port blocked.• If the ring is torn down, the secondary port of the master node will fail to receive Hello packetsbefore the Fail timer expires. The master node will release the secondary port from blocking data