show ip ospf neighbor
27-22 IPv4 Advanced Routing Protocol Configuration
show ip ospf neighbor
Use this command to display the state of communication between an OSPF router and its
neighbor routers.
Syntax
show ip ospf neighbor [detail] [ip-address] [vlan vlan-id]
Parameters
Defaults
If detail is not specified, summary information will be displayed.
If ip-address is not specified, OSPF neighbors will be displayed for all IP addresses configured for
routing.
If vlan-id is not specified, OSPF neighbors will be displayed for all VLANs configured for routing.
Mode
Any router mode.
Example
This example shows how to use the show ospf neighbor command:
C3(su)->router#show ip ospf neighbor
ID Pri State Dead-Int Address Interface
182.127.62.1 1 FULL 40 182.127.63.1 vlan1
Table 27-4 provides an explanation of the command output.
Interface Addr IP address of the designated router on this interface.
Backup Designated
Router id
IP address of the backup designated router on this interface, if one exists, in which
case Err will be displayed.
Timer intervals
configured
OSPF timer intervals. These are either default, or configured with the ip ospf
retransmit-interval (“ip ospf retransmit-interval” on page 27-8), the ip ospf hello-
interval (“ip ospf hello-interval” on page 27-9), the ip ospf retransmit-delay (“ip
ospf transmit-delay” on page 27-9) and the ip ospf dead interval (“ip ospf dead-
interval” on page 27-10) commands.
Table 27-3 show ip ospf interface Output Details (Continued)
Output Field What It Displays...
detail (Optional) Displays detailed information about the neighbors, including the
area in which they are neighbors, who the designated router/backup
designated router is on the subnet, if applicable, and the decimal equivalent
of the E-bit value from the hello packet options field.
ip-address (Optional) Displays OSPF neighbors for a specific IP address.
vlan vlan-id (Optional) Displays OSPF neighbors for a specific VLAN. This VLAN must
be configured for IP routing as described in “Pre-Routing Configuration
Tasks” on page 24-1.
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