Concept Guide

Enabling port security
You can enable or disable port security feature globally on the Dell EMC Networking OS.
You can congure all the MAC address learning limit congurations, only if the port security is enabled on the Dell EMC Networking OS. If
the port security feature is disabled, all the interface level congurations are reset and all dynamically learnt MAC addresses on the
interfaces congured with MAC address learning limit are cleared.
To enable the port security feature globally in the system, use the following command.
• Enable the port security feature.
CONFIGURATION mode
mac port-security
NIC Teaming
NIC teaming is a feature that allows multiple network interface cards in a server to be represented by one MAC address and one IP address
in order to provide transparent redundancy, balancing, and to fully utilize network adapter resources.
The following illustration shows a topology where two NICs have been teamed together. In this case, if the primary NIC fails, trac
switches to the secondary NIC because they are represented by the same set of addresses.
Figure 74. 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 congured on the Dell EMC Networking switch at the time that NIC teaming is being congured on the server.
NOTE
: If you have congured the no mac-address-table station-move refresh-arp command, trac continues to
be forwarded to the failed NIC until the ARP entry on the switch times out.
554 Layer 2