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7-6
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 7 Configuring OSPFv3
Information About OSPFv3
• LSA Types, page 7-6
• Link Cost, page 7-6
• Flooding and LSA Group Pacing, page 7-7
• Link-State Database, page 7-7
LSA Types
Table 7-1 shows the LSA types supported by Cisco NX-OS.
Link Cost
Each OSPFv3 interface is assigned a link cost. The cost is an arbitrary number. By default, Cisco NX-OS
assigns a cost that is the configured reference bandwidth divided by the interface bandwidth. By default,
the reference bandwidth is 40 Gb/s. The link cost is carried in the LSA updates for each link.
Table 7-1 LSA Types
Type Name Description
1 Router LSA LSA sent by every router. This LSA includes state and cost of all links.
Does not include prefix information. Router LSAs trigger an SPF
recalculation. Router LSAs are flooded to the local OSPFv3 area.
2 Network LSA LSA sent by the DR. Lists all routers in the multi-access network. This LSA
does not include prefix information. Network LSAs trigger an SPF
recalculation. See the “Designated Routers” section on page 7-4.
3 Inter-Area
Prefix LSA
LSA sent by the area border router to an external area for each destination
in local area. This LSA includes the link cost from area the border router to
the local destination. See the “Areas” section on page 7-5.
4 Inter-Area
Router LSA
LSA sent by the area border router to an external area. This LSA advertises
the link cost to the ASBR only. See the “Areas” section on page 7-5.
5AS External
LSA
LSA generated by the ASBR. This LSA includes the link cost to an external
autonomous system destination. AS External LSAs are flooded throughout
the autonomous system. See the “Areas” section on page 7-5.
7 Type-7 LSA LSA generated by the ASBR within an NSSA. This LSA includes the link
cost to an external autonomous system destination. Type-7 LSAs are
flooded only within the local NSSA. See the “Areas” section on page 7-5.
8 Link LSA LSA sent by every router, using a link-local flooding scope (see the
“Flooding and LSA Group Pacing” section on page 7-7. This LSA includes
the link-local address and IPv6 prefixes for this link.
9 Intra-Area
Prefix LSA
LSA sent by every router. This LSA includes any prefix or link state
changes. Intra-Area Prefix LSAs are flooded to the local OSPFv3 area. This
LSA does not trigger an SPF recalculation.
11 Grace LSAs LSA sent by a restarting router, using a link-local flooding scope. This LSA
is used for a graceful restart of OSPFv3. See the “High Availability and
Graceful Restart” section on page 7-11.
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