Specifications

1-7
Cisco AS5x00 Case Study for Basic IP Modem Services
11/24/1999
Section 1 Network Design and Case Study Overview
Network Topology, Hardware, and Software Selection
Network Topology, Hardware, and Software Selection
Figure 1-3 shows the devices that are used to build both dial-up access environments.
One recommended topology is used for both companies.
Figure 1-3 Network Topology Elements
Both companies have similar network topologies. The hardware elements and software releases are
described in the following tables.
Internet
24524
Clients
Modems
Network element
management server
(NTP, Syslog, SNMP)
AAA
server
Internet
firewall
Default
gateway
Cisco AS5x00
with integrated
modems
PSTN
PRI lines
Analog lines
DNS
server
IP intranet
Table 1-1 Hardware
Elements
Element Purpose Maui Onions THEnet
Remote clients and
analog modems
To access the IP backbone through
the PSTN.
PCs PCs, Macs,
UNIX
workstations
Cisco AS5x00 NAS To terminate modem calls and
Point-to-Point Protocol (PPP)
sessions.
Cisco AS5300 Cisco AS5800
PRI lines To provide high throughput (64K)
for digital and analog calls.
In general, T1 and T3 trunks can be
ISDN PRIs or channelized T1s.
T1 trunks T3 trunks
Network element
management server
To maintain and monitor the NAS. NTP
1
, syslog
2
,
SNMP
3
NTP, syslog,
SNMP
Remote AAA server To perform basic user
authentication.
TACACS+ RADIUS