Addressing In Ip Multiplexing Networks; Single Subnet - Avaya 1000 Series Configuration Manual

Addressing in IP Multiplexing Networks

IP addressing in an IP Multiplexing design must take into account the fact that the router on
the LAN must see the remote router as residing on the same LAN or IP network. There are a
number of addressing schemes that can fulfill this requirement, including:

• Single subnet

• Split subnet
• Secondary addressing
Consider the following network, consisting of three remote sites. Two remote sites utilize Avaya
equipment, while the third is a simple router/DSU combination. Five IP addressing schemes
are provided below, all refer to the following network.
Figure 12: Addressing in IP Multiplexing Networks
Single Subnet
The emphasis in the single subnet approach is that all seven devices have interfaces in a single
28-bit subnet 192.1.1.0 / 28. The WAN addressing utilizes reserved address space.
Table 13: Single Subnet Addressing
POP Router
POP Avaya
Avaya 1
Router 1
Avaya 2
Router 2
Router/DSU
Avaya Secure Router 1000 Series Configuration Guide
e0: 192.1.1.1/28
e0: wan1: wan2: 192.1.1.2/28 10.1.1.1/30 10.1.1.5/30
wan3: 10.1.1.9/30
e0: wan1: 192.1.1.3/28 10.1.1.2/30
e0: 192.1.1.4/28
e0: wan1: 192.1.1.5/28 10.1.1.6/30
e0: 192.1.1.6/28
s0: 192.1.1.7/28
Theory and Application
December 2010 83