Pirl Setup - RACOM RAy3 User Manual

• Pause limit in [frame]
Value limits the number of continuous Pause refresh frames that can be received on this port (if full-
duplex) or the number of 16 consecutive collisions (if half-duplex). Pause limit in [frame] When a port
has flow control enabled, this parameter can be used to limit how long this port can be Paused or
Back Pressured off to prevent a port stall through jamming. The Flow Control on the port is (tempor-
arily) disabled when the Pause refresh frames count exceeds the value of this parameter.
Setting this parameter to 0 will allow continuous jamming to be received on this port.
• Pause limit out [frame]
Value limits the number of continuous Pause refresh frames that can be transmitted from this port
– assuming each Pause refresh is for the maximum pause time of 65536 slot times. When full-duplex
Flow Control is enabled on this port, this parameter is used to limit the number of Pause refresh
frames that can be generated from this port to keep this port's link partner from sending any data.
Clearing this parameter to 0 will allow continuous Pause frame refreshes to egress this port as long
as this port remains congested.
Setting this parameter to 1 will allow 1 Pause frame to egress from this port for each congestion
situation.
Setting this parameter to 2 will allow up to 2 Pause frames to egress from this port for each congestion
situation, etc.
• Ignore checksum
Enables ignoring Frame checksum (FCS) - or in other words - Force good FCS in the frame. When
this parameter is not set (default behavior), frames entering this port must have a good CRC or else
they are discarded. When this parameter is set, the last four bytes of frames received on this port
are overwritten with a good CRC and the frames are accepted by the switch (assuming that the
frame's length is good and it has a destination).

5.5.2.2. PIRL setup

Page allows to configure PIRL - Port-based Ingress Rate Limiter. It is a useful feature to limit bursts
and storms of packets according different services, priorities and other network parameters to optimize
the usage of limited capacity of RAy wireless link.
Fig. 5.22: Menu Switch settings / Interface / PIRL
The device supports per port TCP/IP ingress rate limiting along with independent Storm prevention.
Port based ingress rate limiting accommodates information rates from 64 Kbps to 1 Mbps in increments
of 64 Kbps, from 1 Mbps to 100 Mbps in increments of 1 Mbps and from 100 Mbps to 1000 Mbps in
increments of 10 Mbps.
In addition to this, the device supports Priority based ingress rate limiting. Given ingress rate resource
can be configured to track any of the four priority traffic types. The device supports a color- blind leaky
bucket scheme, one of the popular schemes for implementing rate limiting. The way a leaky bucket
© RACOM s.r.o. – RAy3 Microwave Link
Configuration
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