H3C S3610 Series Operation Manual
Also see for S3610 Series: ConfigurationQuick startOperation manualOperation manualOperation manual
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Contents
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Operation Manual – RRPPH3C S3610&S5510 Series Ethernet Switches Chapter 1 RRPP Configuration1-8There are two or more domains in a network, and there two different common nodesbetween any two domains. Figure 1-6 defines three RRPP domains, each containingone and only one RRPP primary ring. In the case of multi-domain intersection, the ringsin different domains are independently configured. Each single domain can containmultiple rings, among which there must be one and only one primary ring. The dataVLAN in one domain must be isolated from the data VLAN in another.1.1.4 How RRPP WorksI. Polling mechanismThe primary port of the master node sends Health packets across the control VLANperiodically.z If the ring works properly, the secondary port of the master node will receiveHealth packets and the master node will maintain it in block state.z If the ring is torn down, the secondary port of the master node will not receiveHealth packets after the timeout timer expires. The master node will release thesecondary port from blocking data VLAN while sending Common-Flush-FDBpackets to notify all transit nodes to update their own MAC entries and ARPentries.II. Link down alarm mechanismThe transit node, the edge node or the assistant edge node sends Link-Down packetsto the master node immediately when they find any port belonging to an RRPP domainis down. Upon the receipt of a Link-Down packet, the master node releases thesecondary port from blocking data VLAN while sending Common-Flush-FDB packet tonotify all the transit nodes, the edge nodes and the assistant nodes to update their ownMAC entries and ARP entries.III. Ring recoveryThe master node may find the ring is restored after a period of time after the portsbelonging to the RRPP domain on the transit node, the edge node or the assistant edgenode are up again. A temporary loop may arise in the data VLAN in this period. As aresult, broadcast storm occurs.To prevent temporary loops, non-master nodes block them immediately (and permitsonly the packets of the control VLAN) when they find their ports accessing the ring areup again. The blocked ports are activated only when the nodes ensure that no loop willbe brought forth by these ports.IV. Broadcast storm suppression mechanism in a multi-homed subring incase of primary ring link failureAs shown in Figure 1-5, Ring 1 is the primary ring, and Ring 2 and Ring 3 are subrings.When two links of the primary ring between the edge node and the assistant edge node |
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