mac-table-size
Syntax
mac-table-size limit {
packet-action drop;
}
Hierarchy Level
[edit bridge-domains bridge-domain-name bridge-options], [edit logical-systems logical-system-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], [edit logical-systems logical-system-name routing-instances routing-instance-name switch-options], [edit logical-systems logical-system-name switch-options], [edit routing-instances routing-instance-name bridge-domains bridge-domain-name bridge-options], [edit routing-instances routing-instance-name switch-options], [edit switch-options], [edit switch-options], [edit vlans vlan-name switch-options]
Description
Modify the size of the MAC address table for the bridge domain or VLAN, a set of bridge domains or VLANs associated with a trunk port, or a virtual switch. The default is 5120 MAC addresses.
For multichassis link aggregation (MC-LAG) peers in active-active
mode, configuring the mac-table-size statement
or changing the mac-table-size 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 mac-table-size 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 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.
Options
limit—Specify
the maximum number of addresses in the MAC address table.
Range: 16 through 1,048,575 MAC addresses
Default: 5120 MAC addresses
There is no default MAC address limit for the
mac-table-sizestatement at the[edit switch-options]hierarchy level. The number of MAC addresses that can be learned is only limited by the platform, 65,535 MAC addresses for EX Series switches and 1,048,575 MAC addresses for other devices.
The remaining statement is explained separately. See CLI Explorer.
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] and [edit vlans vlan-name switch-options] hierarchy levels introduced in Junos OS Release 12.3R2 for EX Series switches.
Support at the [edit vlans vlan-name switch-options hierarchy level introduced in Junos OS Release
13.2 for the QFX Series.