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IP R
OUTING
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The full database is exchanged between neighboring routers as soon as a
new router is discovered. Afterwards, any changes that occur in the routing
tables are synchronized with neighboring routers through a process called
reliable flooding. You can show information about different LSAs stored
in this router’s database, which may include any of the following types:
• Router (Type 1) – All routers in an OSPF area originate Router LSAs that
describe the state and cost of its active interfaces and neighbors.
• Network (Type 2) – The designated router for each area originates a
Network LSA that describes all the routers that are attached to this
network segment.
• Summary (Type 3) – Area border routers can generate Summary LSAs
that give the cost to a subnetwork located outside the area.
• AS Summary (Type 4) – Area border routers can generate AS Summary
LSAs that give the cost to an autonomous system boundary router
(ASBR).
• AS External (Type 5) – An ASBR can generate an AS External LSA for
each known network destination outside the AS.
• NSSA External (Type 7) – An ASBR within an NSSA generates an
NSSA external link state advertisement for each known network
destination outside the AS.
Command Attributes
• Area ID – Area defined for which you want to view LSA information.
(This item must be entered in the form of an IP address.)
• Link ID – The network portion described by an LSA. The Link ID
should be:
- An IP network number for Type 3 Summary and Type 5 AS External
LSAs. (When an Type 5 AS External LSA is describing a default route,
its Link ID is set to the default destination 0.0.0.0.)
- A Router ID for Router, Network, and Type 4 AS Summary LSAs.
• Self-Originate – Shows LSAs originated by this router.
• LS Type – LSA Type (Options: Type 1-5, 7). See the preceding
description.