Cabletron Systems MicroMMAC 24T MICROMMAC- - Manual (Page 74)

LOCAL MANAGEMENT
4-20
In Alarm/Remove mode, the MicroMMAC-T sends a “Remove MAC
Frame Command” to new stations attempting to enter the ring. A trap sent
to the NMS informs it of the action taken. If the Remove MAC Frame
Command fails to remove the new station after three attempts, a trap to the
NMS informs it that “the station could not be removed.”
The following sections discuss RING SECURITY screen fields and
provide instructions for using them.
NOTE: Before enabling ring security, you need to designate which
Network Management Stations you wish to receive traps. Refer to
Section 4.3.4 for more information.
STATION ADDRESS
This field lists up to 255 MAC addresses on the ring security allowed list.
Stn Edit
Use the Station Edit command to add or delete stations from the allowed
list and to edit single entries on the allowed list.
Security Mode
Use this command to set the level of security for the ring. Select from the
following Security Modes:
• Disabled - Use this option to temporarily disable ring security so that
new stations can enter the ring. This is the factory default setting.
• Alarm Only - In this mode new stations can enter the ring, but the
NMS receives a station added trap. The trap includes the new station’s
MAC address so that the NMS can decide if the new station should be
allowed on the ring.
NOTE: The NMS receives each station added trap once only.
• Alarm/Remove - This is the highest level of ring security and locks
the ring to new stations. In Alarm/Remove mode, new stations
attempting to enter the ring receive a Remove MAC Frame Command,
and a trap informs the NMS of the action taken. The Remove MAC
Frame Command tries to automatically remove the station from the
ring. If it cannot remove the station from the ring after three attempts,