Routing > OSPF > Diagnostics
Routing
RM GUI HiSecOS EAGLE20/30
Release
3.0
09/2015
331
8.17.1 Statistics
In order to accomplish the 2 basic processes, OSPF routers send and
receive various messages containing information to form adjacencies, and
update routing tables. The counters in the tab indicate the amount of
message traffic transmitted and received on the OSPF interfaces.
Link State Acknowledgments (LSAcks) provide a response to a Link State
Update (LS update) request as part of the link state exchange process.
The hello messages allow a router to discover other OSPF routers in the
area and to establish adjacencies between the neighboring devices. After
establishing adjacencies, the routers advertise their credentials for
establishing a role as either a Designated Router (DR), a Backup
Designated Router (BDR), or only as a participant in the OSPF network.
The routers then use the hello messages to exchange information about
the OSPF configuration in the Autonomous System (AS).
Database Description (DD) messages contain descriptions of the AS or
area topology. The messages also propagate the contents of the link state
database for the AS or area from a router to other routers in the area.
Link State Requests (LS Request) messages provide a means of
requesting updated information about a portion of the Link State
Database (LSDB). The message specifies the link or links for which the
requesting router requires current information.
LS Updates messages contain updated information about the state of
certain links on the LSDB. The router sends the updates as a response to
an LS Request message. The router also broadcast or multicast
messages periodically. The router uses the message contents to update
the information in the LSDBs of routers that receive them.
LSAs contain the local routing information for the OSPF area. The router
transmits the LSAs to other routers in an OSPF area and only on
interfaces connecting the router to the specific OSPF area.
Type 1 LSAs are router LSAs. Each router in an area originates a router-
LSA. A single router LSA describes the state and cost of every link in the
area. The router floods type 1 LSAs only across its own area.
Type 2 LSAs are network LSAs. The DR creates a network LSA from
information received in the type 1 LSAs. The DR originates in its own area
a network LSA for each broadcast and NBMA network it is connected to.
The LSA describes every router attached to the network, including the DR
itself. The router floods type 2 LSAs only across its own area.
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