Service Manual

Version Description
8.3.12.0 Deprecated the no-station-move command (replaced by the mac-
learning-limit mac-address-sticky command).
8.3.7.0 Introduced on the S4810.
8.3.1.0 Added the vlan option on the E-Series.
8.2.1.0 Introduced on the S-Series.
7.7.1.0 Introduced on the C-Series. Added the station-move option.
6.5.1.0 Added support for MAC Learning-Limit on the LAG.
Usage Information
This command and its options are supported on physical interfaces, static LAGs, LACP LAGs, and VLANs.
If you do not specify the vlan option, the MAC address counters are not VLAN-based. That is, the sum of
the addresses learned on all VLANs (not having any learning limit conguration) is counted against the MAC
learning limit.
MAC Learning Limit violation logs and actions are not available on a per-VLAN basis.
With the keyword no-station-move option, MAC addresses learned through this feature on the selected
interface persist on a per-VLAN basis, even if received on another interface. Enabling or disabling this option
has no eect on already learned MAC addresses.
After the MAC address learning limit is reached, the MAC addresses do not age out unless you add the
dynamic option. To clear statistics on MAC address learning, use the clear counters command with
the learning-limit parameter.
NOTE: If you congure this command on an interface in a routed VLAN, and after the MAC
addresses learned reaches the limit set in the mac learning-limit command, IP protocols are
aected. For example, VRRP sets multiple VRRP Masters and OSPF may not come up.
When a channel member is added to a port-channel and there is not enough ACL CAM space, the MAC limit
functionality on that port-channel is undened. When this occurs, un-congure the existing conguration
rst and then reapply the limit with a lower value.
Related Commands
mac learning-limit mac-address-sticky — Replaces deprecated no-station-move parameter.
show mac learning-limit — displays MAC learning-limit conguration.
mac learning-limit learn-limit-violation
Congure an action for a MAC address learning-limit violation.
Syntax
mac learning-limit learn-limit-violation {log | shutdown}
To return to the default, use the no mac learning-limit learn-limit-violation {log |
shutdown} command.
Parameters
log Enter the keyword log to generate a syslog message on a learning-limit violation.
shutdown Enter the keyword shutdown to shut down the port on a learning-limit violation.
858
Layer 2