H3C S3600 Series Operation Manual

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H3C S3600 Series Operation Manual Manual pdf 7 page image

Operation Manual – DLDPH3C S3600 Series Ethernet Switches-Release 1510 Chapter 1 DLDP Configuration1-6Table 1-5 Process received DLDP packetsPacket type Processing procedureIf this neighbor entry does not exist on thelocal device, DLDP creates the neighbor entry,enables the entry aging timer, and switches tothe probe state.AdvertisementpacketExtractsneighborinformationIf the neighbor entry already exists on the localdevice, DLDP updates the entry aging timer.Flush packet Deletes the neighbor entry from the local deviceCreates the neighbor entry if this neighborentry does not exist on the local device.Probe packetSends echopacketscontaining bothneighbor and itsown informationto the peerIf the neighbor entry already exists on the localdevice, updates the entry aging timer.No Discards this echo packetNo Discards this echo packetSets the neighbor flag bitto bidirectional linkEcho packetCheckswhetherthe localdevice isin theprobestateYesCheckswhetherneighborinformationin thepacket isthe sameas that onthe localdeviceYesIf all neighbors are in thebidirectional link state,DLDP switches from theprobe state to theadvertisement state, andsets the echo waitingtimer to 0.3) If no echo packet is received from the neighbor, DLDP performs the followingprocessing:Table 1-6 Processing procedure when no echo packet is received from the neighborNo echo packet receivedfrom the neighbor Processing procedureIn normal mode, no echopacket is received when theecho waiting timer expires.In enhanced mode, no echopacket is received when theenhanced timer expiresDLDP switches to the disable state, outputs log andtracking information, and sends flush packets.Depending on the user-defined DLDP down mode,DLDP disables the local port automatically orprompts you to disable the port manually. DLDPsends an RSY message and deletes the neighborentry.1.1.2 Precautions during DLDP Configurationz DLDP works only when the link is up.