Users Guide

Recovering from Learning Limit and Station Move
Violations
After a learning-limit or station-move violation shuts down an interface, you must manually reset it.
To reset the learning limit, use the following commands.
NOTE: Alternatively, you can reset the interface by shutting it down using the shutdown command and then re-enabling
it using the no shutdown command.
• Reset interfaces in the ERR_Disabled state caused by a learning limit violation or station move violation.
EXEC Privilege mode
mac learning-limit reset
• Reset interfaces in the ERR_Disabled state caused by a learning limit violation.
EXEC Privilege mode
mac learning-limit reset learn-limit-violation [interface | all]
• Reset interfaces in the ERR_Disabled state caused by a station move violation.
EXEC Privilege mode
mac learning-limit reset station-move-violation [interface | all]
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 69. 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.
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