Black Box LR1102A-T1/E1 - Manual (Page 51)

IP Multiplexing
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6.1.4 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 6 Single Subnet Addressing
6.1.5 Split Subnet
This is similar to the single subnet scheme in that all four routers are in the same 28-bit subnet, but the Black Box products are on
smaller, 30-bit subnets.
Table 7 Split Subnet Addressing
POP Router e0: 192.1.1.1/28
POP Black Box e0:
wan1:
wan2:
wan3: 192.1.1.2/28
10.1.1.1/30
10.1.1.5/30
10.1.1.9/30
Black Box 1 e0:
wan1: 192.1.1.3/28
10.1.1.2/30
Router 1 e0: 192.1.1.4/28
Black Box 2 e0:
wan1: 192.1.1.5/28
10.1.1.6/30
Router 2 e0: 192.1.1.6/28
Router/DSU s0: 192.1.1.7/28
POP Router e0: 192.1.1.1/28
POP Black Box e0:
wan1:
wan2:
wan3: 192.1.1.2/30
10.1.1.1/30
10.1.1.5/30
10.1.1.9/30
Black Box 1 e0:
wan1: 192.1.1.5/30
10.1.1.2/30
Router 1 e0: 192.1.1.6/28
Black Box 2 e0:
wan1: 192.1.1.9/30
10.1.1.6/30
Router 2 e0: 192.1.1.10/28
Router/DSU s0: 192.1.1.14/28