Synchronization Of The Lsd - Hirschmann MACH 4000 User Manual

OSPF

7.4 Synchronization of the LSD

The central part of the OSPF is the Link State Database (LSD). This data-
base contains a description of the network and the states of all the routers.
It is the source for calculating the routing table. It reflects the topology of the
network. It is set up after the designated router and backup designated router
have been determined within an area (broadcast networks).
To set up the LSD and update any topology changes, the OSPF router sends
link status advertisements (LSA) to all the directly accessible OSPF routers.
These link status advertisements consist of the interfaces and the neighbors
of the sending OSPF router that can be reached via these interfaces. OSPF
routers put this information into their databases and flood the information to
all the ports.
If no topology changes occur, every router repeats its own LSAs every
30 minutes.
You can view the content of the Link State Database with the CLI command
"show ip ospf database", whereby the entries are output in accordance with
the areas.
enable
show ip ospf database
Routing L3P
Release 4.0 11/07
7.4 Synchronization of the LSD
Switch to the Priviledged EXEC mode.
Displays the neighbor relationships of the router.
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