Alteon Application Switch Operating System Application Guide
Bandwidth Management
Document ID: RDWR-ALOS-V2900_AG1302 763
• IP Source Address—All frames have a specified IP source address or range of addresses
defined with a subnet mask.
• IP Destination Address—All frames have a specified IP destination address or range of
addresses defined with a subnet mask.
• Switch services on the virtual servers.
The following are various Layer 4 groupings:
• A single virtual server
• A group of virtual servers
• A service for a particular virtual server
• A particular port number (service on the virtual server) within a particular virtual server IP
address
The following are various Layer 7 groupings:
• A single URL path
• A group of URL paths
• A single cookie
Classification Precedence
There are two mechanisms for frames that qualify for classifications: a per-contract precedence
value and a default precedence ordering from 1 to 255, where the higher numbers have the higher
precedence. If a contract does not have an assigned precedence value, then the default ordering is
applied as follows:
1. Incoming source port/default assignment
2. VLAN
3. Filter
4. Layer 4 services on the virtual server
5. Layer 7 applications (for example, URL, HTTP, headers, cookies, and so on)
If a frame falls into all of classifications (1 through 5), and if the precedence is same for all the
applicable contracts, then the Layer 7 applications contract classification (precedence level 5) is
assigned because it comes last and has the highest precedence.
Application Bandwidth Control
Classification policies allow bandwidth limitations to be applied to particular applications, meaning
that they allow applications to be identified and grouped. Classification can be based on any filtering
rule, including the following:
• Layer 7 strings—Strings that identify to which application the traffic belongs.
• TCP Port Number—All frames with a specific TCP source or destination port number.
• UDP—All UDP frames.
• UDP Port Number—All frames with a specific UDP source or destination port number.
Combinations
Combinations of classifications are limited to grouping items together into a contract. For example, if
you want to have three different virtual servers associated with a contract, you specify the same
contract index on each of the three virtual server IP addresses. You can also combine filters in this
manner. Combinations are described further in the following sections:
• Grouped Bandwidth Contracts, page 764
—Describes how contracts can be grouped together to
aggregate BMW resources.
• IP User Level Contracts for Individual Sessions, page 765
—Describes a user-level contract.
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