Nortel Networks 5510, 5520, 5530 manual Interface Shaper, Meter Bucket Size and Duration

Filters and QoS Configuration for ERS 5500
Technical Configuration Guide	v2.0	NN48500-559

The following table displays all various bucket size and duration values available using the committed and maximum burst values used in this example.

Table 8: Meter Bucket Size and Duration

				Value to enter
Bucket Size	Max burst rate	Committed rate	Duration	(mSec)
4,096	15000000	10000000	0.0065536	7
8,192	15000000	10000000	0.0131072	13
16,384	15000000	10000000	0.0262144	26
32,768	15000000	10000000	0.0524288	52
65,536	15000000	10000000	0.1048576	105
131,072	15000000	10000000	0.2097152	210
262,144	15000000	10000000	0.4194304	419
524,288	15000000	10000000	0.8388608	839
1,048,576*	15000000	10000000	1.6777216	1678
2,097,152*	15000000	10000000	3.3554432	3355
8,388,608*	15000000	10000000	13.4217728	13422

* ERS5530 10GE only

5.3 Interface Shaper

When configuring interface shaping, the shape rate, burst rate, and burst duration can be configured using the following command:

•5530-24TFD(config)#interface fastEthernet all

•5530-24TFD(config-if)#qos if-shaper port <port #> shape-rate <64-10230000

Kbits/sec> max-burst-rate <64-4294967295 Kbits/sec> max-burst-duration <1- 4294967295 milliseconds>

QoS interface shaping parameters:

Parameter	Description
<portlist>	Ports to configure shaping parameters.
<WORD>	Specify name for if-shaper; maximum is 16 alphanumeric characters.
shape-rate	Shaping rate in kilobits/sec; range is 64-10230000 kilobits/sec.
<64-10230000>
max-burst-rate	Maximum burst rate in kilobits/sec; range is 64-4294967295Kbits/sec.
<64-4294967295>
max-burst-duration	Maximum burst duration in milliseconds; range is 1 to 4294967295 ms.
<1-4294967295>

When configuring interface shaping on an interface, please note the following:

•The maximum burst rate cannot be configured the same as the shape rate. You must always specify a higher maximum burst rate than the shape rate

•The maximum burst rate and burst duration is used to calculate the bucket size or committed burst in bytes

•The maximum burst rate and burst duration is used to calculate the bucket size or committed burst in bytes

oDuration = ((bucketSize*8) / (max-burst-rate – committed-rate))

•Bucket sizes in bytes are 4K, 8K, 16k, 32K, 64K, 128K, 256K, and 512K

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