3Com 4500 PWR 26-Port Configuration Manual page 180

Figure 15-1 Packet processing and mode transition in autoLearn mode and secure mode
secure mode
Is the
source MAC in the MAC
address table?
Yes
802.1X authentication
userLogin: A port performs 802.1X authentication and implements port-based access control.
userLoginSecure: A port performs 802.1X authentication for users and implements MAC-based
access control. The port services only one user passing 802.1X authentication.
userLoginSecureExt: Similar to the userLoginSecure mode except that this mode supports
multiple online 802.1X users.
userLoginWithOUI: Similar to the userLoginSecure mode, however, a port in this mode also
permits frames from a user whose MAC address contains a specified OUI (organizationally unique
identifier).
For description of 802.1X authentication, refer to 802.1x and System Guard Operation.
The port receives a
packet
Security mode?
Change the security
mode to
No
Yes
Drop the packet
15-3
autoLearn mode
Is the source
MAC in the MAC
address table?
No
Save the source MAC as a
secure MAC address
Is the max.
number of secure MAC
reached?
No
Operate
In autoLearn
Forward the packet
Yes