Blue Coat Systems Proxy SG manual Bitrate=

Chapter 3: Condition Reference

bitrate=

Tests if a streaming transaction requests bandwidth within the specified range or an exact match. When providing a range, either value can be left empty, implying either no lower or no upper limit on the test. Bitrate can change dynamically during a transaction, so this policy is re-evaluated for each change. Note that the numeric pattern used to test the bitrate= condition can contain no whitespace. This trigger is only available if the current transaction is a Real Media or Windows Media transaction.

Syntax

bitrate={ [lower]..[upper]exact_rate }

where:

•lower—Lower end of bandwidth range. Specify using an integer, in bits, kilobits (1000x), or megabits (1,000,000x), as follows: integer integerk integerm. If left blank, there is no lower limit on the test.

•upper—Upper end of bandwidth range. Specify using an integer, in bits, kilobits, or megabits, as follows: integer integerk integerm. If left blank, there is no upper limit on the test.

•exact_rate—Exact bandwidth to test. Specify using an integer, in bits, kilobits, or megabits, as follows: integer integerk integerm.

Note: To test an inverted range, the following shorthand expression is available. Instead of writing bitrate=(..28.8k56k..) to indicate bit rates from 0 to 28.8k and from 56k up, the policy language recognizes bitrate=56k..28.8k as equivalent.

Layer and Transaction Notes

•Use in <Cache> and <Proxy> layers.

•Applies to streaming transactions.

•This condition can be used with the max_bitrate( ) property.

Examples

;Deny service for bit rates above 56k. deny bitrate=!0..56k

;This example allows members of the Sales group access to streams up to 2 megabits.

;All others are limited to 56K bit streams.

<proxy>

authenticate(NTLMRealm)

<proxy>

;deny sales access to streams over 2M bits deny group=sales bitrate=!0..2m

;deny non-sales access to streams over 56K bits deny group=!sales bitrate=!0..56k..

;In this form of the rule, we assume that the users are by default denied, and we

;are overriding this to grant access to authorized users.

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