This chapter shows you how to tune the PNNI parameters at the interface level of a switch, which allows you to specify the administrative weight assigned to each of the classes of traffic. These parameters are used at the interface for route selection and computation to support quality-of-service (QoS) routing.
The Interface Tuning window allows you to perform the following tasks:
The Interface Tuning window displays a table of the interfaces on the selected switch along with the assigned administrative weights and other parameters.
To display the parameters for an interface, follow these steps:
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.
The PNNI interfaces and parameters on the selected switch are displayed in the Interface Tuning window (Figure 14-1). These parameters are described in Table 14-1.
Figure 14-1: Interface Tuning Window
Step 4 Click OK when you have read the interface parameters.
Table 14-1: 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:
- 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 is capable of having 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).
From the Interface Tuning window you can access a secondary window that allows you to modify the parameters of an interface.
Note You can use CiscoView to set the value of the administrative weight at the switch level. For details, go to the CWSI main window and select
Help>CiscoView.
To modify the parameters of an interface, follow these steps:
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 14-1).
Step 4 Select an interface to modify.
Step 5 Click Modify.
The Interface Tuning: Modify window opens for the selected interface (Figure 14-2).
Figure 14-2: Interface Tuning: Modify Window
Step 6 Make the desired changes to these parameters of this interface:
- VP Capability--Check to specify this interface as capable of having virtual path connections within it.
- 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 14-1.
Step 7 Click OK to accept your changes and close the window.
Step 8 Click OK in the Interface Tuning window to apply your changes to the agent and close the window.
