Alcatel-Lucent 6850-48 ネットワークガイド

Increasing the MAC Address Table Size

Managing Source Learning

page 2-10

OmniSwitch AOS Release 6 Network Configuration Guide

There are now two source learning modes available for the OmniSwitch 9000 Series switches: synchro-
nized and distributed. By default the switch runs in the synchronized mode, which allows a total MAC 
address tables size of 16K per chassis. Enabling the distributed mode for the switch increases the table size 
to 16K per module and up to 64K OmniSwitch 9000 chassis.

To enable the distributed MAC source learning mode for the chassis, use the 

 command. Enabling this mode increases the size of the MAC address table to allow a larger 

number of learned MAC addresses per chassis. When distributed MAC source learning mode is disabled, 
the switch operates in the synchronized MAC source learning mode (the default). 

Enabling or disabling the distributed MAC source learning mode requires the following three steps:

1 Enter source-learning chassis-distributed enable or source-learning chassis-distributed disable at 
the command line prompt.

2 Enter the write memory command to save the switch configuration.

3 Reboot the switch.

Note. All three of the above configuration steps are required to enable or disable the distributed MAC 
mode. If any of the above steps are skipped, the status of the mode is not changed.

The following limitations apply when the switch is operating in the distributed MAC source learning 
mode:

• MAC addresses learned on link aggregates are still synchronized across all NIs.

• Link aggregates have to span the same ASIC. This usually means the same NI, with the exception of 

the U6-XNI where the first three ports are on one ASIC while the other three ports are on a separate 
ASIC.

Note that increasing the maximum number of learned MAC addresses allowed is not supported on 
OmniSwitch 6400, 6800, 6850, and 6855 switches.