Tuning PNNI Parameters in the Switch Interfaces

This chapter describes how to tune PNNI parameters at the interface level of a switch. By tuning the parameters, you can specify the administrative weight assigned to each class of traffic. The PNNI parameters are used at the switch interface for route selection and computation to support quality-of-service (QoS) routing.

The following section describes how to display and modify the PNNI parameters for a switch interface:

Using the Interface Tuning Window

Using the Interface Tuning Window

The Interface Tuning window displays a table of interfaces for a selected switch, and includes assigned administrative weights and other parameters. The Interface Tuning window also allows you to display and modify PNNI interface parameters. The following sections provide more information:

Displaying PNNI Interface Parameters

Step 1 Display the PNNI topology by double-clicking a PNNI domain or peer group name in the AtmDirector main window.

Step 2 Select a node from the PNNI topology map.

Step 3 Select PNNI Options>Interface Tuning.

The PNNI interfaces and parameters on the selected switch are displayed in the Interface Tuning window (Figure 8-1). These parameters are described in Table 8-1.

Step 4 Click Close after you have read the interface parameters.

Figure 8-1: Interface Tuning Window

Table 8-1: Interface Tuning Field Descriptions

Field Description

Host Name

Name of the switch

PNNI Node ID

PNNI ID of the switch

Interface

Identifier of the local interface

Link Selection

Specifies the method for selecting a link for constant bit rate and variable bit rate call setups. Options are as follows:

Lowest Adm Wt---Transmit calls over the interface with the lowest administrative weight.

Smallest AvCR---Transmit calls over the link with the smallest available cell rate.

Highest Link Speed---Transmit calls over the highest speed link.

Load Balance---Balance calls across links.

VP Capable

Indicates whether the interface can have virtual path connections (VPCs) established within it or not.

Adm. Wt. CBR

The administrative weight of this interface for the constant bit rate service category.

Adm. Wt. rtVBR

The administrative weight of this interface for the real-time variable bit rate service category.

Adm. Wt. nrtVBR

The administrative weight of this interface for the non-real-time variable bit rate service category.

Adm. Wt. ABR

The administrative weight of this interface for the available bit rate service category.

Adm. Wt. UBR

The administrative weight of this interface for the unspecified bit rate service category.

Route Optimization

Specifies whether route optimization is enabled or disabled for this interface.

Field	Description
Host Name	Name of the switch
PNNI Node ID	PNNI ID of the switch
Interface	Identifier of the local interface
Link Selection	Specifies the method for selecting a link for constant bit rate and variable bit rate call setups. Options are as follows: Lowest Adm Wt---Transmit calls over the interface with the lowest administrative weight. Smallest AvCR---Transmit calls over the link with the smallest available cell rate. Highest Link Speed---Transmit calls over the highest speed link. Load Balance---Balance calls across links.
VP Capable	Indicates whether the interface can have virtual path connections (VPCs) established within it or not.
Adm. Wt. CBR	The administrative weight of this interface for the constant bit rate service category.
Adm. Wt. rtVBR	The administrative weight of this interface for the real-time variable bit rate service category.
Adm. Wt. nrtVBR	The administrative weight of this interface for the non-real-time variable bit rate service category.
Adm. Wt. ABR	The administrative weight of this interface for the available bit rate service category.
Adm. Wt. UBR	The administrative weight of this interface for the unspecified bit rate service category.
Route Optimization	Specifies whether route optimization is enabled or disabled for this interface.

Note When the PNNI administrative weight mode is set to "uniform," all interface administrative weights that are not explicitly configured are set to the uniform value of 5040. When the administrative weight mode is set to "linespeed," the default administrative weights are set to values determined by the interface line speed (maximum cell rate).

Modifying PNNI Interface Parameters

Step 1 Display the PNNI topology by double-clicking a PNNI domain or peer group name in the AtmDirector main window.

Step 2 Select a node from the topology map.

Step 3 Select PNNI Options>Interface Tuning to display the Interface Tuning window (Figure 8-1).

Step 4 Select an interface to modify.

Step 5 Click Modify.

The Interface Tuning: Modify window opens for the selected interface (Figure 8-2).

Step 6 Make the desired changes to these parameters of this interface:

Link Selection---Select the method to use when selecting a link over this interface.
Administrative Weight---Enter the administrative weight to use for each traffic type.
Route Optimization---Check to enable route optimization for this interface.

: For a description of these fields, see Table 8-1.

Step 7 Click OK to accept your changes and close the window.

Step 8 Click Apply in the Interface Tuning window to apply your changes to the agent and close the window.

Note You can also use the CiscoView application to set the value of the administrative weight at the switch level. For details, go to the CWSI Campus main window and select Help>CiscoView.

Figure 8-2: Interface Tuning: Modify Window

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