OSPFv3
ExtremeWare XOS 11.3 Concepts Guide
560
Figure 72: Virtual link using area 1 as a transit area
Virtual links are also used to repair a discontiguous backbone area. For example, in Figure 73, 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.
Figure 73: Virtual link providing redundancy
Link-Type Support
You can manually configure the OSPFv3 link type for a VLAN. Table 70 describes the link types.
Table 70: OSPFv3 link types
Link Type Number of Routers Description
Auto Varies ExtremeWare XOS automatically determines the OSPFv3 link type
based on the interface type. This is the default setting.
ABR ABR
EX_044
Area 2 Area 1 Area 0
Virtual link
ABR 1 ABR 2
EX_045
Area 2
Area 0
Area 1 Area 3
Virtual link
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