Cisco Systems IGX 8400 Series manual Interworking Connections in a Tiered Network

IGX Configuration Summary

•For setting up data connections:

—Add the connections (addcon).

—Configure connection parameters ( cnfdclk, cnfcldir, cnfict ).

•For setting up Frame Relay connections:

—Add the connections (addcon).

—Configure connection classes ( cnfcls).

—Configure control templates, channel utilization, and channel priorities ( cnfict , cnfchutl, cnfchpri).

•For setting up ATM connections (see also the paragraph that follows this list for information on connections using ATM-to-Frame Relay interworking):

—Add connections (addcon).

—Configure a connection type ( cnfcontyp).

•Optimize network routing and bandwidth (cnfchutl, cnfpref, cnfcos).

Interworking Connections in a Tiered Network

Two approaches are available for establishing a Frame Relay-to-ATM interworking connection in a tiered network (see the Cisco WAN Switching System Overview for a description of tiered networks). The simplest approach is to use the Connection Manager in Cisco WAN Manager. When you specify a connection to an FRSM on a Cisco MGX 8220 edge concentrator, Cisco WAN Manager directs the node to establish the correct end-to-end connection type. This connection type is either atfr (ATM-to-Frame Relay interworking) or atfst (ATM-to-Frame Relay interworking with ForeSight). The other approach is to use the command line interface on the IGX node or other routing node to execute addcon and related commands (such as cnfcon) to establish the connection between routing nodes. A network interworking connection requires that you specify each individual segment of the connection. (Establishing the connection between the FRSM on the MGX 8220 shelf and the BPX node requires you to execute the addchan command on the Cisco MGX 8220 edge concentrator.)

Configuring an IGX Switch to Be an Interface Shelf

An interface shelf is a non-routing, concentrator shelf that communicates ATM cells to and from a BPX or IGX routing hub in a tiered network. (An interface shelf is also known as a feeder shelf.) An interface shelf is an IGX node configured to be an interface shelf. The MGX 8220 edge concentrator is also an interface shelf. IGX/AF is the designation of an IGX interface shelf.

For an IGX node to serve as an interface shelf, personnel in the TAC must first configure the node for that purpose because tiered network capability is a purchased option.

You can add an interface shelf from Cisco WAN Manager or the command line interface (CLI). The steps for adding a new interface shelf to a network are:

Step 1 Activate the trunk between the interface shelf and routing hub. On the CLI, use uptrk. (Note that you do not subsequently use addtrk for the interface shelf.)

Step 2 Configure the trunk for STI cell headers and BPX Addressing Mode (BAM).

Step 3 Add the IGX/AF to the hub (after the TAC has enabled this feature) by using addshelf.

You add the shelf from the routing hub.

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