Virtual Links; Stub Area - Extreme Networks BlackDiamond 6800 User Manual

Area 0
Figure 9-1: Stub area
V L
IRTUAL
In the situation when a new area is introduced that does have a direct physical
attachment to the backbone, a virtual link is used. A virtual link provides a logical path
between the ABR of the disconnected area and the ABR of the backbone. A virtual link
must be established between two ABRs that have a common area, with one ABR
connected to the backbone.
B D U G
LACK IAMOND SER UIDE
ABR
1 2 3 4 A
G4X G4X G6X G6X MSM
INKS
Figure 9-2
B 5 6 7 8
MSM F32T F32T F32T G4X
Stub
Area
illustrates a virtual link.
O
VERVIEW OF
BD_012
OSPF
9-7