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Rate Limits
A bandwidth policy specifies three limits, listed and described in
Table 17-1 Bandwidth Rate Limits
Rate Limit
Committed Information
Rate (CIR)
or Reserved Limit
Soft Limit
Hard Limit
Bandwidth Policy Configuration
Each bandwidth policy, comprised of the reserved, soft, and hard limits, is assigned an index.
These policies can be found under the /cfg/bwm menu. Up to 64 bandwidth policies can be
defined. Bandwidth limits are usually entered in Mbps.
N
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number. For example, 1 Mbps can be entered as either "1" or as "1024k."
Table 17-2
Table 17-2 Bandwidth Policy Limits
Bandwidth Range
250 Kbps to 5000 Kbps
1 Mbps to 20 Mbps
20 Mbps to 50 Mbps
In addition, a queue size is associated with each policy. The queue size is measured in bytes.
212777-A, February 2002
Description
This is a rate that a bandwidth classification is always guaranteed. In con-
figuring BWM contracts, ensure that the sum of all committed informa-
tion rates never exceeds the link speeds associated with ports on which
the traffic is transmitted. In a case where the total CIRs exceed the out-
bound port bandwidth, the switch will perform a graceful degradation of
all traffic on the associated ports.
This is the desired bandwidth rate, that is, the rate the customer has
agreed to pay on a regular basis. When output bandwidth is available, a
bandwidth class will be allowed to send data at this rate. No exceptional
condition will be reported when the data rate does not exceed this limit.
This is a "never exceed" rate. A bandwidth class is never allowed to trans-
mit above this rate. Typically, traffic bursts between the soft limit and the
hard limit are charged a premium. The maximum hard limit for a band-
width policy is 1 Gbps, even when multiple Gigabit ports are trunked.
–
For better granularity, rates can be entered in Kbps by appending "K" to the entered
lists the granularity of policy limits:
Interval
Bandwidth Range
250 Kbps
50 Mbps to 150 Mbps
1 Mbps
150 Mbps to 500 Mbps
5 Mbps
500 Mbps to 1000 Mbps
Chapter 17: Bandwidth Management
Web OS 10.0 Application Guide
Table
17-1:
Interval
10 Kbps
25 Mbps
50 Mbps
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