Chapter 19
| Unicast Routing
Configuring the Open Shortest Path First Protocol (Version 2)
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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.
Parameters
These parameters are displayed:
◆ Process ID – Process ID as configured in the Network Area configuration screen
(see page 717).
◆ Query by – The LSA database can be searched using the following criteria:
■
Self-Originate – LSAs generated by this router.
■
Link ID – LSAs advertising a specific link.
■
Adv Router – LSAs advertised by a specific router.
◆ Link State Type – The information returned by a query can be displayed for all
LSA types or for a specific type. (Default: All)
Information displayed for each LSA entry includes:
◆ Area ID – Area defined for which LSA information is to be displayed.
◆ Link ID – Network portion described by an LSA. The Link ID is either:
■
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.
◆ Adv Router – IP address of the advertising router.
◆ Age – Age of LSA (in seconds).
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