Owner's Manual

692 | Chapter 25. OSPFv3
NETGEAR 8800 User Manual
Virtual links are also used to repair a discontiguous backbone area. For example, in
Figure 77, 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 77. Virtual Link Providing Redundancy
Link-Type Support
You can manually configure the OSPFv3 link type for a VLAN. Table 70 describes the link
types.
Note: The number of routers in an OSPFv3 point-to-point link is
determined per VLAN, not per link.
Note: All routers in the VLAN must have the same OSPFv3 link type. If
there is a mismatch, OSPFv3 attempts to operate, but it may not be
reliable.
Table 70. OSPFv3 Link Types
Link Type Number of
Routers
Description
Auto Varies XCM8800 automatically determines the OSPFv3 link type based on the
interface type. This is the default setting.
Broadcast Any Routers must elect a designated router (DR) and a backup designated
router (BDR) during synchronization. Ethernet is an example of a
broadcast link.
Passive A passive link does not send or receive OSPFv3 packets.
ABR 1 ABR 2
EX_045
Area 2
Area 0
Area 1 Area 3
Virtual link