H3C S7500 Series Operation Manual page 349

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches
Router A
Area 0
Figure 4-5 OSPF area
A virtual link cannot pass through a stub area. The backbone area (area 0)
cannot be configured as a stub area. So, if a virtual link has been set up between
RTB and RTC, neither area 1 nor area 0 can be configured as a stub area. In
Figure
A router in a stub area cannot receive external routes.
The backbone area must guarantee the connectivity between various nodes.
Transit Area
Router B
Virtual Link
ABR
Area 1
4-5, only area 2 can be configured as a stub area.
Router C
Router D
ABR
Area 2
4-31
Chapter 4 OSPF Configuration