3com 8807 Reference Guide

C

HAPTER

 12: MAC A

DDRESS

 T

ABLE

 M

ANAGEMENT

 C

OMMANDS

this port will no longer learn any more MAC addresses; and you can use the undo 
mac-address max-mac-count command to remove the limit on the number.

n 

■

The maximum number of MAC addresses on an I/O Module ranges from 12 K 
to 16 K depending on various software versions and module types.

■

The aforementioned number of MAC addresses includes only the MAC 
addresses learned by the switch dynamically, and excludes those configured by 
the user.

■

When executing the mac-address max-mac-count command, if the current 
number of MAC addresses exceeds the threshold value, the switch neither 
delete the present MAC address entries nor learn new MAC address until the 
number of entries less than the threshold value after some entries are aged 
out.

Related command: mac-address and mac-address timer.

Set the maximum number of MAC addresses learned by Ethernet port 
Ethernet3/1/3 to 600.

<SW8800> system-view

 

System View: return to User View with Ctrl+Z.  

 

[SW8800] interface Ethernet3/1/3

 

[3Com-Ethernet3/1/3] mac-address max-mac-count 600 

mac-address max-mac-count enable { alarm | forward }*

undo mac-address max-mac-count enable { alarm | forward }*

Ethernet port view

Use the mac-address max-mac-count enable { alarm | forward }* command to 
enable the switch to send alarms to the network administrator and forward the 
packets whose source MAC addresses are not learned by the port when the 
number of MAC addresses automatically learned by the port reaches the threshold 
value.

Use the undo mac-address max-mac-count enable { alarm | forward }* 
command to disable the function.

Use the mac-address max-mac-count enable forward command to enable the 
switch to forward the packets whose source MAC addresses are not learned by 
the port when the number of MAC addresses automatically learned by the port 
reaches the threshold value.