Link-state update packets contain one or more link-state advertisements and are sent
following a change in network conditions.
• Link-state acknowledgement packets
Link-state acknowledgement packets acknowledge receipt of link-state updates
containing the header information from the received link-state advertisements.
Link-state advertisements
OSPF does not require each router to send the entire routing table to the neighbors. Instead,
each OSPF router floods only link-state change information in the form of link-state
advertisements (LSAs) throughout the area or AS. LSAs in OSPF are one of the following six
types:
• Router-links advertisement
A router originates one or more router LSAs for an area. Each router LSA contains
interface descriptions. The router LSAs for an area describe the states of all the router
interfaces to the area. Link-state ID fields distinguish multiple router LSAs.
• Network-links advertisement
The link designated router originates a network LSA for every broadcast or NBMA link
having two or more attached routers. The network LSA lists all routers attached to the link.
• Inter-area-prefix links advertisement
The inter-area-prefix links advertisement describes an external prefix that is internal to
the autonomous system.
• Inter-area-router links advertisement
The inter-area-router links advertisement describes a path to a destination external OSPF
router (an ASBR) that is internal to the Autonomous System.
• As-external links advertisement
The as-external links advertisement describes a path to a prefix. The described path is
external to the Autonomous System.
• link LSA
OSPFv3 includes link LSA for the following three purposes:
- to provide the router link-local address to other routers on a link
- to distribute the prefixes associated with the link to routers on the link
- to allow the router to insert option bits to the network LSA
IPv6 routing fundamentals
44 Configuration — IPv6 Routing
November 2010
Содержание ERS 8600 series
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