Synonymous Areas

When an L1 IS services more than one area, these additional areas are called

synonymous areas. Arouter can support any number of synonymous areas, as long

as there is an overlap of at least one area address between adjacent routers. For

example, in Figure 25on page 292, Area 1 and Area 2 are synonymous areas to

each other and Areas 3 and 4 are also synonymous to each other.

N1
N1
N4
N4
N2
N2
N3
N3
N3
N3
N5
N5
Area 1
Area 1
Area 2
Area 2
L1/L2
L1/L2
L1/L2
L1/L2
L1
L1
L1
L1
backbone
backbone
Domain 1
Domain 2
L2
L2
Inter-Domain

Figure 24. OSI Domain

Using OSI/DECnet V
Chapter9. Using OSI/DECnet V 291