Configure Redundant Pairs - Dell Z9000 Configuration Manual

10/25/40/50/100gbe throughput

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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 re-associated with another port in the ARP table, configure the mac-

address-table station-move refresh-arp command on the Dell Networking switch at the time

that NIC teaming is being configured on the server.

NOTE: If you do not configure the mac-address-table station-move refresh-arp

command, traffic continues to be forwarded to the failed NIC until the ARP entry on the switch

Figure 56. Configuring the mac-address-table station-move refresh-arp Command

Configure Redundant Pairs

Configuring redundant pairs is supported on the Z9000 platform.

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 following illustration). The

redundant pairs feature allows you to create redundant links in networks that do not use STP by

configuring backup interfaces for the interfaces on either side of the primary link.

NOTE: For more information about STP, refer to

Assign a backup interface to an interface using the switchport backup command. The backup

interface remains in a Down state until the primary fails, at which point it transitions to Up state. If the

primary interface fails, and later comes up, it becomes the backup interface for the redundant pair. Dell

Networking OS supports Gigabit, 10 Gigabit, and 40-Gigabit interfaces as backup interfaces.

Spanning Tree Protocol