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Synonymous Areas
When an L1 IS services more than one area, these additional areas are called
synonymous areas. A router 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 25 on 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
Chapter 9. Using OSI/DECnet V 291