Specifications

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Cisco Nexus 3000 Series NX-OS Unicast Routing Configuration Guide, Release 5.0(3)U2(2)
OL-25782-02
Chapter 3 Configuring OSPFv2
Information About OSPFv2
Figure 3-2 OSPFv2 Areas
The ABR has a separate link-state database for each area to which it connects. The ABR sends Network
Summary (type 3) LSAs (see the “Route Summarization” section on page 3-10) from one connected area
to the backbone area. The backbone area sends summarized information about one area to another area.
In Figure 3-2, Area 0 sends summarized information about Area 5 to Area 3.
OSPFv2 defines one other router type: the autonomous system boundary router (ASBR). This router
connects an OSPFv2 area to another autonomous system. An autonomous system is a network controlled
by a single technical administration entity. OSPFv2 can redistribute its routing information into another
autonomous system or receive redistributed routes from another autonomous system. For more
information, see “Advanced Features” section on page 3-8.)
Link-State Advertisements
OSPFv2 uses link-state advertisements (LSAs) to build its routing table.
This section includes the following topics:
• LSA Types, page 3-5
• Link Cost, page 3-6
• Flooding and LSA Group Pacing, page 3-6
• Link-State Database, page 3-7
• Opaque LSAs, page 3-7
LSA Types
Table 3-1 shows the LSA types supported by Cisco NX-OS.
ABR1
ABR2
Area 0
Area 3
Area 5
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