Cisco Systems 8600 Series manual Tag Switching Resource Configuration Parameters

Tag Switching Resource Configuration Parameters

Tag Switching Resource Configuration Parameters

This section describes resource partitioning for tag switching. It includes the following:

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Summary

Configuring VSI LCNS

Useful Default Allocations

Details of More Rigorous Allocations

Summary

Most tag switching configuration, including the provisioning of connections, is performed directly by the Tag Switch Controller. This is discussed separately; refer to the Tag Switching for the Cisco 7500/7200 Series Routers documentation. Configuration for tag switching on the BPX 8650 itself, consists of basic VSI configuration, including resource partitioning.

The following items need to be configured or checked on the BPX 8650:

•Partitioning

On each interface (port or trunk) on the BXM cards used for tag switching, two sets of resources must be divided up between traditional PVC connections and tag switching connections. The traditional PVC connections are configured directly on the BPX platform, and tag switching connections are set up by the TSC using the VSI. The following resources are partitioned on each interface:

—Bandwidth

—Connections

As with all ATM switches, the BPX switch supports up to a specified number of connections. On the BPX switch, the number of connections supported depends on the number of port/trunk cards installed. On each interface, space for connections is divided up between traditional BPX switch permanent virtual circuit (PVC) connections, and Tag Switching VCs (TVCs). The details of connection partitioning using the cnfrsrc command are discussed later in this section.

•Queues for Tag Switching traffic

These should be automatically configured correctly, but it is possible to change the configuration manually. Consequently, the configuration of the queues should be checked as part of the process of enabling tag switching. Configuration of these parameters using the cnfqbin command is discussed later in this chapter.

•VSI Control Interface

A trunk must be enabled as VSI control interface, to allow a TSC to be connected. This is done using the addshelf command and selecting the VSI option.

Tag Switching 9-11