Hirschmann GREYHOUND GRS1020, Справочное руководство

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Network load control
10.3 Rate limiter
121
UM Config GRS
Release 8.0 09/2019
10.3 Rate limiter
The rate limiter function helps ensure stable operation even with high traffic volumes by limiting
traffic on the ports. The rate limitation is performed individually for each port, as well as separately
for inbound and outbound traffic.
If the data rate on a port exceeds the defined limit, then the device discards the overload on this
port.
Rate limitation occurs entirely on Layer 2. In the process, the rate limiter function ignores protocol
information on higher levels such as IP or TCP. This can affect the TCP traffic.
To minimize these effects, use the following options:

Limit the rate limitation to certain packet types, for example, Broadcasts, Multicasts, and
Unicasts with an unknown destination address.

Limit the outbound data traffic instead of the inbound traffic. The outbound rate limitation works
better with TCP flow control due to device-internal buffering of the data packets.

Increase the aging time for learned Unicast addresses.
Perform the following steps:

Open the
Switching > Rate Limiter
dialog.

Activate the rate limiter and set limits for the data rate. The settings apply on a per port
basis and are broken down by type of traffic:

Received Broadcast data packets

Received Multicast data packets

Received Unicast data packets with an unknown destination address
To activate the rate limiter on a port, mark the checkbox for at least one category. In the
Threshold unit
column, you specify whether the device interpretes the threshold values as
percent of the port bandwidth or as packets per second. The threshold value 0 deactivates
the rate limiter.

To save the changes temporarily, click the button.