User manual

Chapter 2 - Managing a Single Device/Cell Bridging Page
AlvariCRAFT Device Manager 104 User Manual
2.19.1.3 Ethernet Broadcast/Multicast Limiter
The Ethernet Broadcast/Multicast Limiter feature enable to limit the number of
broadcast and/or multicast packets that can be transmitted per second, in order
to prevent the potential flooding of the wireless medium by certain ARP attacks.
In SUs, the limiter is placed after the Ethernet Broadcast Filters. For this reason,
the limiter will receive only the packets that pass through these filters. If the
Ethernet filters of the SU are disabled, the limiter will be applied to all relevant
packets received.
When the Ethernet Broadcast/Multicast Limiter is enabled and the specified limit
is reached, the unit will send a trap. The trap will be sent periodically till the
number of broadcast/multicast packets will be less than the maximum. The trap
will inform the user how many packets were discarded in the last period.
The Ethernet Broadcast/Multicast Limiter section includes the following
parameters:
Limiter Option This parameter defines the limiter's functionality. The available
options are:
 Disable: No limiter
 Limit only Broadcasts
 Limit Multicasts except Broadcasts
 Limit all Multicasts (including broadcast)
Limiter Threshold
(packets/sec)
This parameter defines the maximum number of packets per second
that may pass the limiter when it is enabled.
The range is from 0 to 204800 (packets/second).
Send Trap Interval (min) This parameter defines the minimum time in minutes between two
consecutive transmissions of the trap indicating the number of
packets that were dropped by the limiter since the previous trap (or
since the time that the limit has been exceeded).
The range is from 1 to 60 minutes.