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Chapter 4
OSPF Areas
This is a simple output that shows only one ABR and one ASBR. In order
to have an ABR, you must have multiple areas configured. In order to have
an ASBR, external routes on an external autonomous system must be con-
nected to the router.
show ip ospf database
The information displayed by this command indicates the number of links
and the neighboring Router ID. The output is broken down by area. Here is
a sample output:
RouterA#show ip ospf database
OSPF Router with ID (172.16.240.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
172.16.240.1 172.16.240.1 1530 0x80000016 0x9C7C 4
172.16.241.1 172.16.241.1 667 0x80000008 0x3AFF 3
RouterA#
show ip ospf interface
This command displays all interface-related OSPF information. Data is dis-
played about OSPF information for all interfaces or for specified interfaces.
Information includes the interface IP address, area assignment, Process ID,
Router ID, network type, cost, priority, DR/BDR (if applicable), timer inter-
vals, and adjacent neighbor information. Here is a sample output:
RouterA#show ip ospf interface
BRI0 is administratively down, line protocol is down
OSPF not enabled on this interface
BRI0:1 is administratively down, line protocol is down
OSPF not enabled on this interface
BRI0:2 is administratively down, line protocol is down
OSPF not enabled on this interface
Ethernet0 is up, line protocol is up
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