Specifications

Configuring and Managing Integrated Modems
Managing Modems
DC-89
Cisco IOS Dial Technologies Configuration Guide
You should also include the host name, timeout interval, and authentication key:
Router(config)# tacacs-server host 10.4.1.10
Router(config)# tacacs-server timeout 20
Router(config)# tacacs-server key nas1
Configuring Virtual Partitioning
Virtual partitioning creates one large modem pool on one access server, but assigns different DNIS
numbers to different customers. Each incoming DNIS consumes resources from the same modem pool,
but a maximum connect option is set for each DNIS.
Figure 21 shows two Internet service provider (ISP) customers who are leasing modems from another
service provider. Each ISP is assigned its own DNIS number and range of modems. Each ISP is
guaranteed a certain number of physical modem ports for simultaneous connections. After an ISP uses
up all the modems assigned to its DNIS, a busy signal is issued.
Figure 21 Modem Pooling Using Virtual Partitioning
Virtual partitioning essentially resells modem banks to customers, such as a small-sized ISP. However,
remember that modem pooling is a single-chassis solution, not a multichassis solution. Modem pooling
is not a solution for reselling ports on a large-scale basis.
The following procedure creates one modem pool on a Cisco AS5300 access server for two ISP
customers. The shared modem pool is called isp56kpool. However, both ISP customers are assigned
different DNIS numbers and are limited to a maximum number of simultaneous connections.
See Figure 21 for the network topology.
The following hardware configuration is used on the Cisco AS5300 access server:
• One 4-port T1 PRI card
• Two 48-port cards containing sixteen 6-port MICA 56K modem modules
ISP-A client
dialing in to
a leased POP
ISP-B client
dialing in to
a leased POP
Cisco AS5300 loaded
with 96 MICA modems.
Leasing modems to
ISP-A and ISP-B.
Four PRI
or CE1 lines
13052
Modem pool: ISP-A
Modems in pool: 48
Assigned DNIS: 5551111
Maximum connections: 48
Modem pool: ISP-B
Modems in pool: 48
Assigned DNIS: 5552222
Maximum connections: 48
Backbone
leading to the
Internet
Fast Ethernet
PSTN