
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 | |
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Hardware |
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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. | |
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2 backbone |
| Enables management data streams to enter the NOC. |
gateways |
| Routes traffic to the intranet WAN and the Internet. |
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2 Cisco 2511 OOB | Accesses the console ports in the Cisco AS5800s by using | |
console servers | management lines. | |
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3 AAA servers | One server in each POP to authenticate, authorize, and account for dial access | |
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| clients by using RADIUS. |
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| One server in the NOC to authenticate, authorize, and account for router |
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| administrators by using TACACS+. |
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1 Cisco PIX firewall | Protects the NOC by filtering the devices that can access management services, | |
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| such as TACACS+, RADIUS, syslog, and SNMP. |
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3 Sun Ultra 10 | Operates the dial NMS inside the NOC. Solaris version 2.6 is used. | |
workstations |
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The following
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 |
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| Busy Hour | Users | Lines |
| AS5800s |
Time | Ratio | Required | Required | Chassis Calculation | Required |
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3 months | 10:1 | 50,000 | 5000 | 5000 lines / 1288 = 3.88 chassis | 4 AS5800s |
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1 year | 10:1 | 100,000 | 10,000 | 10,000 lines / 1288 = 7.76 chassis | 8 AS5800s |
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5 years | 10:1 | 1,000,000 | 100,000 | 100,000 lines / 1288 = 77.64 chassis | 78 AS5800s |
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Basic Dial NMS Implementation Guide
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