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In addition to SLAs that describe an applications use of Network Gatekeeper, there is a separate SLA that defines that application’s access to underlying network elements. In addition, there is an SLA that defines Network Gatekeeper as a whole’s access to underlying network elements. These are known as Node SLAs and are expressed in XML.
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Defines under which conditions one, or a set of network node(s) can be accessed by Network Gatekeeper. This contract takes into account which service provider a requests originates from.
This tag is use for service provider node SLAs. These SLAs are provisioned using the management operations described in Service Provider Node SLAs.
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Defines under which conditions one or a set of network node(s) can be accessed by Network Gatekeeper. This contract does not take into account which service provider a requests originates from. It defines how Network Gatekeeper as a whole can use the node(s).
These SLAs are provisioned using the management operations described in Global node SLAs
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Specifies the network node's node ID as registered in the Plug-in manager.A node ID can be assigned to one or more network nodes and the contract is subsequently valid for one or a group of nodes.
The plug-in manager is used for provisioning of node IDs, see the section about the
Plug-in manager in the System Administrator’s Guide.
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Content of this tag specifies a number of requests. Specifies the number of requests allowed during the time-period specified in <timePeriod>. |
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The SLAs are written in XML. The SLA looks slightly different depending on the type of node SLA. The types are:
The schema for the global node SLA is found in:
$BEA_Home/wlng400/modules/com.bea.wlcp.wlng.policy_<version>.jar: sla_schema/global_node_sla_file.xsd
The schema for the service provider group node SLA is found in:
$BEA_Home/wlng400/modules/com.bea.wlcp.wlng.policy_<version>.jar: sla_schema/sp_node_sla_file.xsd
The service provider group node SLA consists of an <sla> tag containing zero (0) or more <nodeContract> tags as shown in Listing 10-1. The serviceProviderGroupID attribute specifies the service provider group for which the SLA file is valid. The structure and contents of the <nodeContract> tag is further described in Global contract data.
<Sla serviceProviderGroupID="spGroup1"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="sp_node_sla_file.xsd">
<nodeContract>
<!--Contract data for network node 1-->
</nodeContract>
<nodeContract>
<!--Contract data for network node 2-->
</nodeContract>
<nodeContract>
<!--Contract data for network node n-->
</nodeContract>
</Sla>
The <nodeContract> tags contains a set of tags that define under which conditions a network node can be accessed by a service provider. See Listing 10-2. The contents of each tag are further described below the listing.
<nodeContract>
<startDate>2005-01-01</startDate>
<endDate>2010-06-01</endDate>
<nodeID>A</nodeID>
<nodeRestrictions>
<nodeRestriction>
<reqLimit>10</reqLimit>
<timePeriod>1000</timePeriod>
</nodeRestriction>
</nodeRestrictions>
</nodeContract>
The global node SLA consists of an <sla> tag containing zero (0) or more <globalContract> tags as shown in Listing 10-3. In this case, the serviceProviderGroupID attribute is left empty. The structure and contents of the <globalContract> tag are further described in Node Contract.
<Sla xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="global_node_sla_file.xsd">
<globalContract>
<!--Contract data for network node 1-->
</globalContract>
<globalContract>
<!--Contract data for network node 2-->
</globalContract>
<globalContract>
<!--Contract data for network node n-->
</globalContract>
</Sla>
The <globalContract> tags contains a set of tags that define under which conditions a network node can be accessed. The contents of each tag are further described below in Listing 10-4.
<globalContract>
<startDate>2005-01-01</startDate>
<endDate>2010-06-01</endDate>
<nodeID>A</nodeID>
<globalRestrictions>
<globalRestriction>
<reqLimit>1000</reqLimit>
<timePeriod>10000</timePeriod>
<guaranteePercentage>50</guaranteePercentage>
</globalRestriction>
</globalRestrictions>
</globalContract>
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