H3C S5820 Configuration Manual

Also see for s5800 series: Installation manual Instruction manual Command reference Quick start Troubleshooting guide

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H3C S5820 Configuration Manual Manual pdf 9 page image

1-2the upper or lower layer devices can be aggregated, and thus the reliability of the IRF virtual deviceis increased through link backup.z Powerful network expansion capability. By adding member devices, the number of IRF ports andnetwork bandwidth of the IRF virtual device can be easily expanded. Each member device has itsown CPU and they can independently process and forward protocol packets; therefore, theprocessing capability of the IRF virtual device also can be easily expanded.Application and AdvantagesAs shown in Figure 1-1, the master and a slave form an IRF virtual device, which is a single device tothe upper and lower layer devices.Figure 1-1 IRF networkingIP networkIRF virtual deviceIP networkIRF link Equal toMaster SlaveBasic ConceptsThe IRF technology involves the following basic concepts:RoleThe devices that form an IRF virtual device are called IRF member devices. Each of them plays eitherof the following two roles:z Master: Manages the IRF virtual device.z Slave: All members that operate as the backups of the master are called slaves. When the masterfails, the IRF virtual device automatically elects a new master from one of the slaves.Master and slaves are elected through the role election mechanism. An IRF virtual device has only onemaster at a time. Other members are the slaves. For the detailed role election process, refer to RoleElection.IRF portAn IRF port is a logical port dedicated to the internal connection of an IRF virtual device, which can benumbered as IRF-port1 or IRF-port2. An IRF port is effective only when it is bound to a physical IRFport.