Back-to-Back Router HSSI Interfaces [Cisco Port Adapters]

Document ID: 14197

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Configure
      Network Diagram
      Configurations
Verify
Troubleshoot
Related Information

Introduction

This document provides a sample configuration for connecting router High-Speed Serial Interface (HSSI) interfaces back-to-back.

To connect two routers back-to-back with HSSI, attach a null modem cable CAB-HNUL= (Part Number 72-0727-01) between the HSSI ports.

The hssi dce command puts the interface to DCE, so that you are able to change the clock rate on the interface. When you configure the hssi internal-clock at both sides, the interfaces become up/up. However, you cannot ping the interfaces.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on the following software versions:

Cisco IOS® Software Releases 12.1(6),12.1(6)T or later.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

melanie#show running-config
Building configuration 
! 
version 12.1 
! 
hostname melanie 
! 
interface Ethernet0/0 
ip address 172.17.243.106 255.255.255.0 
! 
interface Hssi3/0 
ip address 10.1.1.1 255.255.255.0 
hssi dce 
clockrate 44732632 
! 
line con 0 
exec-timeout 0 0 
transport input none 
line aux 0 
line vty 0 4 
password ww 
login 
! 
end 


melanie#ping 10.1.1.2 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms 
melanie#

diana

diana#show running-config 
Building configuration... 

Current configuration: 
! 
version 12.0 
! 
hostname diana 
! 
! 
interface Hssi0/0 
ip address 10.1.1.2 255.255.255.0 
ip directed-broadcast 
hssi internal-clock 
! 
line con 0 
exec-timeout 0 0 
password 7 131200 
transport input none 
line aux 0 
line vty 0 4 
exec-timeout 0 0 
password 7 131200 
login 
! 
end 


diana#ping 10.1.1.1 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 10.1.1.1, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms 
diana#

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