Qos Egress Queue Shaping; Configuring Qos Interface Shaper - Avaya ERS 45 Series Technical Configuration Manual

5. QoS Egress Queue Shaping

You can use QoS Egress Queue Shaping to configure egress shaping on a port by port and queue by
queue basis.
QoS shaper rate queue servicing on the Avaya ERS 4000, ERS 5600, ERS 5900, and VSP 7000 uses a
weighted round robin algorithm to shape traffic. With egress queue shaping, you can specify the
maximum and minimum egress shaping rates on an individual port and queue basis. You can configure
shaping criteria for any or all egress queues associated with a switch port. The number of egress queues
available for a port is determined by the QoS agent egress queue set value.
You can use queue shaping in conjunction with interface shaping.
Bandwidth allocation for queues is done according to Strict Priority and WRR algorithm. When shapers on
queues with minimum rate are configured, the system first tries to assure minimum rate for all queues.
Then the system uses the remaining bandwidth according to Strict Priority, WRR and shape maximum
rate configured for each queue. In case the sum of shape minimum rates configured (queue shapers)
exceeds the line rate, minimum shape rate will be assured for queue 1 and then remaining bandwidth will
be distributed to the rest of the queues using WRR algorithm in order to assure the minimum rates for the
rest of queues. For the same scenario ERS5600 switches may use strict priority, WRR and RR
algorithms, depending on the active queue set.

5.1 Configuring QoS Interface Shaper

Use the following procedure to configure the interface shaping parameters for a set of ports.
To configure parameters, use the following command from Interface Configuration mode:
[no] qos if-shaper [name <WORD>] [shape-rate <64-10230000>] [burst-size <burst-
size>] [max-burst-rate <64-4294967295>] [max-burst-duration <1-4294967295>]
Use the no form of this command to disable interface shaping for a set of ports.
Action Option
<WORD>
shape-rate <64-10230000>
burst-size <burst-size>
max-burst-rate <64-4294967295>
max-burst-duration
<1-4294967295>
September 2015
Description
Specify name for if-shaper; maximum is 16 alphanumeric
characters.
Shaping rate in kilobits/sec; range is 64-10230000
kilobits/sec.
Committeed burst size in Kilobytes. The value range is: 4,
8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192,
16384.
Maximum burst rate in kilobits/sec; range is 64-
4294967295Kbits/sec.
Maximum burst duration in milliseconds; range is 1–
4294967295 ms.
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