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Software Configuration Guide for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-03
Chapter 3
Configuring with the Command-Line Interface
Configuring the 1-Port HSSI Network Module
Invoke ATM on a HSSI Line
If you have an ATM DSU, you can invoke ATM over a HSSI line by mapping an ATM virtual path
identifier (VPI) and virtual channel identifier (VCI) to a DXI frame address. ATM-DXI encapsulation
defines a data exchange interface that allows a DTE (such as a router) and a DCE (such as an ATM DSU)
to cooperate to provide a User-Network Interface (UNI) for ATM networks.
To invoke ATM over a serial line, perform the following tasks in interface configuration mode:
Convert HSSI to Clock Master
You can convert the HSSI interface into a 45-MHz clock master by performing the following task in
interface configuration mode:
Disable Fair Queueing
Disabling fair queuing will dramatically improve fast switching rates over the HSSI. To disable fair
queueing, perform the following task in interface configuration mode:
For more information about configuring HSSI interfaces, refer to the “Configuring Serial Interfaces”
chapter in the Cisco IOS Release 11.3 Configuration Fundamentals Configuration Guide.
Configuration Examples
The following example shows how to configure a 1-port HSSI network module on a Cisco 3600 series
router. Both sides of the network connection need to be configured:
interface hssi 0/0
ip address 10.1.1.1 255.255.255.0
hssi internal-clock
no fair-queue
no shutdown
interface hssi 1/0
ip address 10.1.1.2 255.255.255.0
hssi internal-clock
no fair-queue
no shutdown
Task
Command
Specify the encapsulation method.
encapsulation atm-dxi
Map a given VPI and VCI to a DXI frame
address.
dxi map
protocol address vpi vci
[broadcast]
Task
Command
Convert the HSSI interface into a
51.84-MHz clock master.
hssi internal-clock
Task
Command
Disable fair queueing.
no fair-queue
