interface-mac-limit
Syntax
interface-mac-limit {
limit;
disable;
packet-action;
}
Hierarchy Level
[edit bridge-domains bridge-domain-name bridge-options], [edit bridge-domains bridge-domain-name bridge-options interface interface-name], [edit logical-systems logical-system-name bridge-domains bridge-domain-name bridge-options], [edit logical-systems logical-system-name bridge-domains bridge-domain-name bridge-options interface interface-name], [edit logical-systems logical-system-name routing-instances routing-instance-name bridge-domains bridge-domain-name bridge-options], [edit logical-systems logical-system-name routing-instances routing-instance-name bridge-domains bridge-domain-name bridge-options interface interface-name], [edit logical-systems logical-system-name routing-instances routing-instance-name switch-options], [edit logical-systems logical-system-name routing-instances routing-instance-name switch-options interface interface-name], [edit logical-systems logical-system-name switch-options], [edit logical-systems logical-system-name switch-options interface interface-name], [edit routing-instances routing-instance-name bridge-domains bridge-domain-name bridge-options], [edit routing-instances routing-instance-name bridge-domains bridge-domain-name bridge-options interface interface-name], [edit routing-instances routing-instance-name switch-options], [edit routing-instances routing-instance-name switch-options interface interface-name], [edit switch-options], [edit switch-options], [edit switch-options interface interface-name], [edit switch-options interface interface-name], [edit vlans vlan-name switch-options], [edit vlans vlan-name switch-options interface interface-name]
Description
Configure a limit to the number of MAC addresses that can be learned from a bridge domain, VLAN, virtual switch, or set of bridge domains or VLANs.
For multichassis link aggregation (MC-LAG) peers in active-active
mode, configuring the interface-mac-limit statement or changing the interface-mac-limit configuration
when traffic is flowing can cause the MAC entries to be out of synchronization
between the two MC-LAG peers, which might result in flooding. To avoid
flooding, you must either halt traffic forwarding and then configure
the interface-mac-limit statement or use
the commit at configuration statement to
commit the changes at the same time in both the peer nodes.
Alternatively, if flooding does occur, you can clear the bridge MAC table on both the routers or switches by using the clear bridge mac-table command. Running this command ensures that the MAC entries are re-learned and in synchronization between both the peers.
In devices that support Enhanced Layer 2 Software (ELS), if you are configuring
interface-mac-limit for an interface and the family ethernet-switching
configuration knob is not enabled on that interface, you must enable it.
In devices that do not support ELS, if you are configuring interface-mac-limit
for an interface and the
family bridge
configuration knob is not enabled on that interface, you must enable
it.
Default
The default MAC limit varies with the platform.
Options
disable—Disables the global
interface-mac-limit configuration on an interface and sets the maximum
interface-mac-limit that is permitted on the device.
limit—Sets the maximum
number of MAC addresses learned from an interface.
Range: 1 through <default MAC limit> MAC addresses per interface. Range is platform specific.
If you configure both disable and limit, disable takes precedence and packet-action is set to none. The remaining statement is explained separately.
Required Privilege Level
routing—To view this statement in the configuration.
routing-control—To add this statement to the configuration.
Release Information
Statement introduced in Junos OS Release 8.4.
Support for the switch-options statement added in
Junos OS Release 9.2.
Support for top-level configuration for the virtual-switch type of routing instance added in Junos OS Release 9.2. In
Junos OS Release 9.1 and earlier, the routing instances hierarchy
supported this statement only for a VPLS instance or a bridge domain
configured within a virtual switch.
Support for logical systems added in Junos OS Release 9.6.
[edit switch-options], [edit switch-options interface interface-name], [edit vlans vlan-name switch-options], and [edit vlans vlan-name switch-options interface interface-name] hierarchy levels introduced in Junos OS Release 12.3R2 for EX Series switches.