Nortel 5530 Engineering Manual page 24

Filters and QoS Configuration for ERS 5500
Technical Configuration Guide
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For the 10 GigE module only, available for the Ethernet Routing Switch 5530, it supports
bucket sizes of 4K, 8K, 16K, 32K, 64K, 128K, 256K, 512K, 1024K, 2048K, 4096K, and
8192K.
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If you do not specify maximum burst duration when setting up a shaper, the maximum
bucket size will be automatically set. For all 10/100 Mbps and 1 GigE ports, the maximum
bucket size is 512K. Also, it does not matter what value you enter for the maximum burst
rate as long as it is larger than the committed rate.
Example
Let's assume you wish to set the committed rate to 40M and set the bucket size to 4K for port 8.
To accomplish this, please use the following commands:
1. Calculate the duration, expressed in milliseconds.
Using the actual bucket size from table 7 and a maximum burst rate of 50M
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Duration = ((bucketSize*8) / (max-burst-rate – committed-rate))
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Duration = ((4,096 * 8) / (50,000,000 – 40,000,000))
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Duration = 3.2768 ms
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Rounded down, the duration value is 3 ms
2. Next, enter the following commands on the Ethernet Switch 5500. Enter an in profile action id
of 3 for an in profile action of Bronze. Enter an out of profile action of 1 for an out of profile
action of drop traffic.
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5530-24TFD(config)#interface fastEthernet all
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5530-24TFD(config-if)# qos if-shaper port 8 shape-rate 40000 max-burst-rate 50000
max-burst-duration 3
3. Use the following command to view the shaper just configured.
•
5530-24TFD(config)# show qos if-shaper port 8
Unit Port IfIndex
____ ____ _______ ________________ ________ ________
1 8 8
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v2.0
Name Rate
(Kbps) (Bytes)
40000 4096
External Distribution
NN48500-559
Burst
Size
23