Allied Telesis AT-S105 - Manual (Page 122)

Chapter 10: Bandwidth Control
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Overview
The Bandwidth Control features available in the AT-S105 Management
software allow you to limit Ethernet traffic within your switch based on
specific criteria. You can use Storm Control to limit the switching of various
types of Ethernet packets. With Ingress and Egress Rate Limiting, you can
limit the traffic volume at the input or output ports respectively.
Storm Control
The Storm Control feature allows you regulate the reception rate of
broadcast, multicast, and destination lookup failure (DLF) packets. The
AT-S105 Management software allows you to set separate limits for each
port beyond which each of the different packet types are discarded. Each
setting can be configured on individual ports or on all of the ports of the
AT-FS750/24POE and AT-FS750/48 switches. Traffic is measured in
packets per second. See the following definitions for more information
about these settings.
ˆ Destination Lookup Failure - The Destination Lookup Failure (DLF)
setting is concerned with comparing the destination MAC address of a
packet received by the switch to the forwarding database. When the
AT-FS750/24POE or AT-FS750/48 switch receives a packet, it scans
the forwarding database and looks for a match to the destination MAC
address in the received packet. If the MAC address is not present in
the forwarding database, then the packet is flooded according to the
VLAN ingress and egress rules. By default, this setting is disabled on
the switch which means that all DLF packets are automatically
forwarded according to the VLAN ingress and egress rules.
ˆ Broadcast Setting - The broadcast setting applies to allowing or
denying broadcast packets on each port.
ˆ Multicast Setting - The multicast setting applies to allowing or denying
multicast packets on each port.
ˆ Threshold Level - In regards to Bandwidth control, the threshold level
is the number of DLF, broadcast, and multicast packets that are sent
by or received from a port. This value is measured in packets per
second. You can set the threshold level to low, medium, or high.
Note
The packet sizes affected by this threshold level can vary in size
from 64 Bytes to 1024 Bytes.