Allied Telesis AT-S102 - Manual (Page 173)

Converteon Management Software User’s Guide
173
Ingress Rate Limit
Egress Rate Limit These selections are used to impose packet rate limiting on
the ports of the line cards and so restrict the flow of network
traffic through the AT-CM Line Cards. Packet rate limiting is
used for storm prevention and to protect against the
formation of bottlenecks in a network topology. The rate
limits, which are in kilobits and megabits per second, can be
applied separately on the two ports on a line card.
The Ingress Rate Limit controls the maximum number of bits
per second a port accepts from the device connected to it.
The port discards any frames that exceed the limit.
The Egress Rate Limit controls the maximum number of bits
per second a port transmits to the network device connected
to it. Traffic exceeding the limit is discarded by a port.
To set a rate limit on a port on the AT-CM2 Line Cards, you
can choose from the following predefined values:
ˆ 128 Kbps
ˆ 256 Kbps
ˆ 512 Kbps
ˆ 1 Mbps
ˆ 2 Mbps
ˆ 4 Mbps
ˆ 8 Mbps
ˆ 0 - No rate limiting (default setting)
For instance, if you select 512 Kbps as the ingress rate limit
for a port on a line card, the card would accept up to that
number of bits per second from the network device
connected to the port and would discard bits exceeding the
threshold.
Rate limiting on the AT-CM3 Line Cards is handled
differently. You can specify a value rather than select from
predefined numbers. However, the value that you set has to
conform to a specific increment, which varies depending on
the range in which you are filtering. The ranges and
increments are listed here:
Table 21. Port Configuration Menu
Setting Description