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This chapter describes the CWM Service Class Template (SCT) desktop application. The SCT application allows users to map standard connection protocol parameters for AXSM, AXSM-E, and RPM cards using a set of data structures that associate VSI service types to sets of pre-configured Virtual Channel (VC), and Class of Service Buffer (CoSB) parameters.
The Service Class Template application is a Java based CWM process that allows for creating SCT files which can then be loaded to nodes, and can be associated with interfaces on cards within the nodes. This application is launched from the CWM desktop and allows users and network operators to configure AXSM, AXSM-E, and RPM cards, using the Service Class Template feature. Specifically, users or network operators are able to use the SCT application to create, modify, delete, load, and associate SCT files to AXSM cards and ports.
The Virtual Channel Descriptor Template is a component of a Service Class Template that contains platform specific VC configuration, and is indexed primarily by Service Type. A Service Type is a concept for grouping connections that share a common set of traffic characteristics and QoS (Quality of Service) requirements. The VC Descriptor Template defines SCT parameters that are applied to all VCs and that match a specified Service Type. As defined in the SCT MIB for the AXSM card, a VC Descriptor for AXSM consists of 36 elements, including the SCT ID, of which the VC Descriptor is a part, the Service Type and the CoSB number, which indicates the CoSB used for the connections.
The Class of Service Buffer is a buffer or queue that serves connections with similar QoS requirements. A CoSB Descriptor Template contains CoSB configurations, with 18 attributes for AXSM cards indexed by CoSB number.
CWM is shipped with two default SCT files. When a PXM card is installed for the first time, the PXM card does not have SCT files. Therefore, the user must download the two default SCT files to the PXM card. The files are located in the directory ~svplus/sct-file/1. Downloading the two default SCT files is required before bringing up the node for the first time.
After they have been downloaded, the retrieved SCT files are displayed when you select the SCT tab which is also the default tab of the Navigator panel.
To start the SCT application, first start the CWM desktop from the CWM Main Menu, as described in "Starting and Stopping Cisco WAN Manager." Select "Application" from the Menu bar, and choose "Service Class Template" from the drop down menu.
The request covers both card and port association. It is a card association if the SCT file type is Ingress, and a port association if the SCT file type is Egress.
The main SCT window consists of the following:
SCT Main window
The SCT GUI allows the following functions to be performed in three different ways:
The Menu bar consists of File, View, and Help menus
The Tool bar contains shortcut buttons to the Button panel and some File menu options:
The Navigator panel consists of two tab-forms: the SCT tab and the Node tab. Each tab contains a Tree view which allows data to be visually displayed in a hierarchical file format.
The SCT tab is the default tab of the Navigator panel. This tab allows an authorized user to view nodes by SCT file. Nodes are displayed by expanding the SCT file node. Each SCT file can have more than one node since each SCT file can be downloaded to more than one Network node. In addition, an SCT file can also be associated by more than one Card node and more than one Port node.
The Node tab allows an authorized user to view SCT files by the Network node hierarchy. When Network nodes are expanded, subnodes are displayed. A Network node includes SCT file node, Card node, and Port node. If a subnode is a leaf node, then it does not have a reference and therefore can not be expanded.
In addition, when a SCT file node is selected in the Navigator panel, the SCT file data will be displayed in the Data panel. The Data panel displays VC and CoSB parameters which can be modified only if the following conditions are met:
The SCT tab is the default tab of the Navigator panel. In the SCT tab window, all SCT files are visually displayed in a tree format. In the SCT tab, whenever a SCT file is selected, the SCT file data is displayed in the Data Panel. If an SCT file node is not a leaf node, then it can be expanded to display Network nodes, Card nodes, and Port nodes. This expansion cycle will be repeated for each subnode that is not a leaf node:
In the Node tab, nodes are also displayed in a tree format. Network nodes can be expanded to view Card nodes, Port nodes, and SCT file nodes. If the Card node is not a leaf node, then it can be expanded to view the associated SCT file and its ports. The same also applies to a Port node. That is if the Port node is not a leaf node, then it can also be expanded to view the associated SCT file node.
As with the SCT Navigator view, whenever the SCT file node is selected, the SCT file data is displayed in the Data Panel.
Note that since the SCT GUI application applies only to AXSM cards, the Node view only displays ASXM cards of a Network node.
The status bar is simply a label which displays the status information of the request. For example, if the modify request can not be completed because of a lock, the status bar will display the relevant error message.
The Button panel contains the following options: Save, Save As, Delete, Reset, Download, and Associate. (Some of these options can also be found on the Tool bar and under the File menu options dropdown.) These buttons are enabled or disabled by the following matrix.
| State/Button | Save | Save As | Delete | Download | Associate |
|---|---|---|---|---|---|
| Read Only | Disable | Disable | Disable | Disable | Disable |
| Create State (Not Load) | Enable | Enable | Enable | Enable | Disable |
| Load State | Disable | Enable | Disable | Enable | Enable |
| Associated State | Disable | Enable | Disable | Enable | Enable |
The logical sequence of loading and associating SCT files is as follows:
Create(Save As)->Modify(Save)->Load(Download)->Associate
The Path label gives the location of the selected SCT Card or Port file.
The Data panel displays the SCT data of associated VC parameters and CoSB parameters. These parameters are displayed in two sub-panels: a VC panel and a CoSB panel. The VC panel contains both VC parameters and CoSB parameters in a table format. The CoSB panel displays only CoSB parameters.
The VC panel is organized into a series of tab panes. Each tab represents a group of VC parameters which categorically belong to that group. In addition, there are two tabs of which one displays all VC parameters and the other displays all CoSB parameters. Currently, there are a total of eight tabs and each represents a group. They are
Each tab displays parameters in table format, with different criteria and associated data presented in each column of a given table. Each row represents a unique Service Type. Under each tab, a user will find a maximum of twelve rows which represent up to 12 different Service Types. They are: CBR.1, RT VBR.1, RT VBR.2, RT VBR.3, NRT VBR.1, NRT VBR.2, NRT VBR.3, UBR.1, UBR.2, ABR.1, CBR.2, CBR.3, VSI Signal.
By selecting a row on the table, the corresponding CoSB parameters are also displayed in the bottom CoSB panel.
Except for Service Type and Service Category columns, most columns under each VC tab have drop down boxes which allow authorized users to edit and modify cells as needed.
Cells are editable and can be changed ONLY if both of the following conditions are met:
The CoSB panel displays CoSB parameters by CoSB Number. The data on this panel reflects the row selection of the table on the VC or top panel. These parameters are currently organized into three groups: Rate & Priority, Threshold, and Miscellaneous.
If you select a different CoSB number by selecting another row from the table of the top panel, the data on this panel will simultaneously change to reflect your selection.
In addition, when you move from one tab to the next, the data on this panel will simultaneously change if the CoSB number has also been changed.
As with the VC parameters, the CoSB parameters in this panel can also be changed only if both of the following conditions are met:
Create an SCT file by selecting the "New" button on the Button panel or by pulling down the Option menu bar and select the New option. This will clear all Service Type tables, the CoSB table on the VC panel and all CosB parameters on the CoSB panel. When is done, you must activate the "Create" button to begin the SCT file creation request.
Load an SCT file by selecting the SCT file in SCT tab panel and activating the "Download" button. This will prompt the user for the Node ID. Once the Node ID is entered, the user selects "OK" to load the SCT file into the specified node. CWM provides a tool called sctLoad that passes the SCT information to the CWM database. CWM does not read the SCT information directly, it only reads data from the database.
Selecting an SCT file in the SCT tab or Node tab will display the SCT parameters in the Main panel for viewing and modification. If user does not have permission or the SCT file is associated, the displaying parameters will not be editable for modifying. When SCT file parameters has been edited, the modification request is started only by pushing the "Save" button in the Main panel.
An SCT file can be associated only if it is loaded into the node. A loaded SCT file is identified by the fact that it has a leaf node on the SCT tree. On the Node tree view, if an SCT file is a leaf node of a node, then that SCT file is loaded into that node. To associate the SCT file, select the appropriate SCT file in the Tree panel and activate the Associate button in the button panel. The system prompts you for a Port or Card ID. After entering the ID, press the OK button to associate the SCT file.
The user can delete an SCT file only if it is not loaded and not associated. To delete an SCT file, first select the appropriate SCT file and then activate the Delete button in the button panel.
Posted: Fri Sep 29 12:24:38 PDT 2000
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