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Network Design for a Dial NMS Case Study
Hardware Requirements
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Basic Dial NMS Implementation Guide
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:
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 4 Hardware Description for Two POPs and the NOC
Hardware Purpose
4 Cisco AS5800
access servers
Two access servers in each POP to provide access in to the Internet from the
PSTN. Cisco IOS Release 12.0(7)T is installed in each access server.
2 backbone
gateways
Enables management data streams to enter the NOC.
Routes traffic to the intranet WAN and the Internet.
2 Cisco 2511 OOB
console servers
Accesses the console ports in the Cisco AS5800s by using out-of-band (OOB)
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
workstations
Operates the dial NMS inside the NOC. Solaris version 2.6 is used.
Table 5 Capacity-Planning Matrix for the Line and Chassis Requirements
Time
Busy Hour
Ratio
Users
Required
Lines
Required Chassis Calculation
AS5800s
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