Cisco Systems Dial NMS manual Hardware Requirements, Hardware Purpose

Network Design for a Dial NMS Case Study

Hardware Requirements

In this case study, THEnet initially sends syslog data across WAN links to the NOC. The WAN links are designed to support a large network capacity in a metropolitan area. Collecting syslog locally in each POP is a future design consideration.

Hardware Requirements

To design the dial NMS for the two POPs and the NOC, the network engineers at THEnet defined these hardware requirements:

Table 4	Hardware Description for Two POPs and the NOC
Hardware		Purpose
4 Cisco AS5800		Two access servers in each POP to provide access in to the Internet from the
access servers		PSTN. Cisco IOS Release 12.0(7)T is installed in each access server.
2 backbone		Enables management data streams to enter the NOC.
gateways		Routes traffic to the intranet WAN and the Internet.
2 Cisco 2511 OOB		Accesses the console ports in the Cisco AS5800s by using out-of-band (OOB)
console servers		management lines.
3 AAA servers		One server in each POP to authenticate, authorize, and account for dial access
		clients by using RADIUS.
		One server in the NOC to authenticate, authorize, and account for router
		administrators by using TACACS+.
1 Cisco PIX firewall		Protects the NOC by filtering the devices that can access management services,
		such as TACACS+, RADIUS, syslog, and SNMP.
3 Sun Ultra 10		Operates the dial NMS inside the NOC. Solaris version 2.6 is used.
workstations

The following capacity-planning calculations were made to determine the number of required lines and Cisco AS5800s for the next five years.

Basic parameters:

•There are 23 available bearer channels per PRI line

•There are 28 PRI lines per T3 card (644 channels)

•Each Cisco AS5800 has two T3 cards

•There are 1288 available bearer channels per dual T3 Cisco AS5800

Table 5	Capacity-Planning Matrix for the Line and Chassis Requirements
	Busy Hour	Users	Lines		AS5800s
Time	Ratio	Required	Required	Chassis Calculation	Required
3 months	10:1	50,000	5000	5000 lines / 1288 = 3.88 chassis	4 AS5800s
1 year	10:1	100,000	10,000	10,000 lines / 1288 = 7.76 chassis	8 AS5800s
5 years	10:1	1,000,000	100,000	100,000 lines / 1288 = 77.64 chassis	78 AS5800s

Basic Dial NMS Implementation Guide

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