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DES-7200 Configuration Guide Chapter 6 REUP Configuration
6-10
Fig 7 State after REUP sends MAC address updating message
To avoid the aforementioned defect, we need to enable MAC address updating on
Switch D. While Gi0/2 starts to forward packets, Switch D will send MAC update
message on Gi0/2. After Switch A receives such MAC address updating message, it
will clear the MAC address on port Gi0/3, so that Switch A can forward the packets
transmitted from server to PC to the port connected to Switch B, thus quickening the
convergence of packet forwarding.
To reduce the side effect of flooding caused by MAC address updating, we have
introduced the MAC address update group, which means that multiple ports will be
included in the group. When one port in this group receives the MAC address updating
message, it will update the MAC address information on other ports within this group.