Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.14.1.0 - Page 530
Con Redundant Pairs
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Figure 71. Redundant NICs with NIC Teaming When you use NIC teaming, consider that the server MAC address is originally learned on Port 0/1 of the switch (shown in the following) and Port 0/5 is the failover port. When the NIC fails, the system automatically sends an ARP request for the gateway or host NIC to resolve the ARP and refresh the egress interface. When the ARP is resolved, the same MAC address is learned on the same port where the ARP is resolved (in the previous example, this location is Port 0/5 of the switch). To ensure that the MAC address is disassociated with one port and reassociated with another port in the ARP table, the no mac-address-table station-move refresh-arp command should not be configured on the Dell EMC Networking switch at the time that NIC teaming is being configured on the server. NOTE: If you have configured the no mac-address-table station-move refresh-arp command, traffic continues to be forwarded to the failed NIC until the ARP entry on the switch times out. Figure 72. Configuring the mac-address-table station-move refresh-arp Command Configure Redundant Pairs Networks that employ switches that do not support the spanning tree protocol (STP) - for example, networks with digital subscriber line access multiplexers (DSLAM) - cannot have redundant links between switches because they create switching loops (as shown in the 530 Layer 2
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