Link-State Advertisements - Cisco Nexus 7000 Series Configuration Manual

Chapter 6 Configuring OSPFv2
S e n d d o c u m e n t c o m m e n t s t o n e x u s 7 k - d o c f e e d b a c k @ c i s c o . c o m .
Figure 6-2
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
to the backbone area. The backbone area sends summarized information about one area to another area.
In Figure
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

Link-State Advertisements

OSPFv2 uses link-state advertisements (LSAs) to build its routing table.
This section includes the following topics:
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LSA Types
Table 6-1
OL-20002-02
OSPFv2 Areas
Area 0
ABR2
Area 5
6-2, Area 0 sends summarized information about Area 5 to Area 3.
"Advanced Features" section on page
LSA Types, page 6-5
Link Cost, page 6-6
Flooding and LSA Group Pacing, page 6-6
Link-State Database, page 6-7
Opaque LSAs, page 6-7
shows the LSA types supported by Cisco NX-OS.
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
ABR1
"Route Summarization" section on page
6-8.)
Information About OSPFv2
Area 3
6-10) from one connected area
6-5