Administrator Guide

CONFIGURATION mode
mac-address-table disable-learning lldp
• Disable source MAC address learning from LACP and LLDP BPDUs.
CONFIGURATION mode
mac-address-table disable-learning
If you don’t use any option, the mac-address-table disable-learning command disables source MAC address learning from
both LACP and LLDP BPDUs.
Enabling port security
You can enable or disable port security feature globally on the Dell EMC Networking OS.
You can configure all the MAC address learning limit configurations, only if the port security is enabled on the Dell EMC Networking OS. If
the port security feature is disabled, all the interface level configurations are reset and all dynamically learnt MAC addresses on the
interfaces configured 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, traffic
switches to the secondary NIC because they are represented by the same set of addresses.
Figure 72. 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 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.
510 Layer 2