H3C S5120-EI Series Configuration Manual

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Contents

H3C S5120-EI Series Configuration Manual Manual pdf 106 page image

97• Dedicated to dual uplink networks• Subsecond convergence• Easy to configureTerminologySmart link groupA smart link group consists of only two member ports: the master and the slave ports. At a time, only oneport is active for forwarding, and the other port is blocked and in standby state. When link failure occurson the active port due to port shutdown or presence of unidirectional link, the standby port becomesactive to take over and the original active port transits to the blocked state.As shown in Figure 22, Port1 and Port2 of Device C and Port1 and Port2 of Device D each form a smartlink group, with Port1 being active and Port2 being standby.Master/slave portMaster port and slave port are two port roles in a smart link group. When both ports in a smart linkgroup are up, the master port preferentially transits to the forwarding state, and the slave port stays instandby state. Once the master port fails, the slave port takes over to forward traffic. As shown in Figure22, you can configure Port1 of Device C and Port1 of Device D as master ports, and Port2 of Device Cand Port2 of Device D slave ports.Master/slave linkThe link that connects the master port in a smart link group is the master link. The link that connects theslave port is the slave link.Flush messageFlush messages are used by a smart link group to notify other devices to refresh their MAC addressforwarding entries and ARP/ND entries when link switchover occurs in the smart link group. Flushmessages are common multicast data packets, and will be dropped by a blocked receiving port.Protected VLANA smart link group controls the forwarding state of some data VLANs (protected VLANs). Different smartlink groups on a port control different protected VLANs. The state of the port in a protected VLAN isdetermined by the state of the port in the smart link group.Transmit control VLANThe transmit control VLAN is used for transmitting flush messages. When link switchover occurs, thedevices (such as Device C and Device D in Figure 22) broadcast flush messages within the transmitcontrol VLAN.Receive control VLANThe receive control VLAN is used for receiving and processing flush messages. When link switchoveroccurs, the devices (such as Device A, Device B, and Device E in Figure 22) receive and process flushmessages in the receive control VLAN and refresh their MAC address forwarding entries and ARP/NDentries.