RACOM Ray2, Руководство пользователя

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Possible actions:
- Discard the frame
- Pass the frame and
send flow control frame
back to the source
- Pass the traffic
EBS: Excess Burst Size
CBS: Committed Burst Size
CIR: Committed Information Rate
All bucket calculations
done in units of tokens
Passed frame size
based token update
EBS Limit
CBS Limit
CIR
Fig. 7.21: Leaky bucket
Port name
Identification of the internal switch port. The switch ports are connected to an ex-
ternal port or to an internal device (radio modem, management CPU).
The external port (with RJ45 interface) labeled "E1+POE".
The external port (with SFP interface) labeled "E2".
The internal radio modem - link to the peer unit.
The internal port to management CPU. Eth1
Eth2
Air
CPU
Id
Each port can be assigned up to five different ingress rate resources.
Each resource defines a rule (filter) for the incoming frame. If the rule is met, the
frame is affected (as set by the EBS limit action parameter). If the incoming frame
doesn't meet any rule, it is not affected by PIRL. The frame is accepted and forwar-
ded further to the switch engine.
CIR (estimated)
The Committed Information Rate (CIR) is dependent on the Bucket Rate factor and
the Bucket increment.
The calculation is estimated due to the fact, the real data throughput depends on
frame size. The Accounted bytes parameter affects this as well.
The formula for the CIR (in bits per second) is as follows: CIR = a * BRF / BI.
Where "a" is constant, which is 12 500 000 for Accounted bytes="frame", and is
100 000 000 for Accounted bytes="layer1". BRF is Bucket Rate factor and BI is
Bucket increment.
Bucket rate
factor
This is a factor which determines the amount of tokens that need to be decremented
for each rate resource decrement (which is done periodically based on the Com-
mitted Information Rate).
Bucket
increment
Bucket increment (BI) indicates the amount of tokens that need to be added for
each byte of the incoming frame.
Mode
Rate type or Traffic type of rate limiting. See Bucket type parameter.
Edit
Press Edit to edit selected or add another PIRL resource.
Disable
Press Disable to delete selected PIRL resource.
Add resource
Press Add resource button to add another PIRL resource.
93 © RACOM s.r.o. – RAy2 Microwave Link
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