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E
XTREME
W
ARE
S
OFTWARE
U
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G
UIDE
12-9
O
VERVIEW
OF
OSPF
Figure 12-1: Virtual link using Area 1 as a transit area
Virtual links are also used to repair a discontiguous backbone area. For example, in
Figure 12-2, if the connection between ABR1 and the backbone fails, the connection
using ABR2 provides redundancy so that the discontiguous area can continue to
communicate with the backbone using the virtual link.
ABR ABR
EW_016
Virtual link
Area 2 Area 1 Area 0
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