Specifications

Table Of Contents
1-6
Cisco AS5800 Operations, Administration, Maintenance, and Provisioning Guide
DOC-7810814=
Chapter1 Introduction
Network Topology and Equipment Selection
Configuration Design Parameters
Before Cisco AS5800 equipment is deployed at your site, define the following configuration design
parameters:
IP subnetting and address strategy
Device parameters
Network dial plan
Figure 1-2 IP Subnetting Diagram
Note Uses private RFC 1918 IP addresses. For more information, refer to the Best Current
Practice memo available online at
http://www.ietf.org/rfc/rfc1918.txt
IP Subnetting Plan
The following list describes IP subnetting plan considerations. Identify network names, assigned
subnets, and descriptions.
1. Headquarters block (172.22.0.0/17)
The headquarters portion of the class-B IP address block for the corporate user or ISP.
The top half of 172.22.0.0 is the IP address pool for the incoming remote-node modem users.
The lower half of 172.22.0.0 is reserved for the devices inside the corporate or ISP network.
2. Remotes block (172.22.128.0/17)
The upper half of 172.22.0.0 is reserved for remote networks.
3. Headquarters-access (172.22.66.0/26)
The headquarters access Ethernet subnet. All access devices are directly connected to this
subnet.
If additional access servers and POP-management devices are needed, they are assigned to this
IP subnet. This approach simplifies network design.
V
33179
Clients
Modems
Hq-access
172.22.66.0/26
NAS loopbacks
172.22.90.0/24
172.22.99.0/24
IP intranet
Internet
firewall
Internet
PSTN