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Chapter 12: Storm Control
142
Overview
The features available in the AT-S110 Management Software allow you to
limit Ethernet traffic within your switch based on specific criteria. You can
use Storm Control to limit the bandwidth 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.
The Storm Control feature allows you regulate the reception rate of
broadcast, multicast, and destination lookup failure (DLF) packets. The
AT-S110 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-GS950/16PS switch. Traffic is measured in packets per second. See
the following definitions for more information about these settings.
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-GS950/16PS 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, then the packet is flooded according to the
VLAN rules. By default, this setting is disabled on the switch which
means that all DLF packets are automatically forwarded according
to the VLAN rules.
Broadcast Setting - The broadcast setting applies to allowing or
denying broadcast packets on each port.
Multicast Setting - The multicast setting applies to allowing or
denying multicast packets on each port.
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.