Verifying OSPF Neighbors

Purpose

OSPF neighbors are interfaces that have an immediate adjacency. On a point-to-point connection between the Services Router and another router running OSPF, verify that each router has a single OSPF neighbor.

Action

From the CLI, enter the show ospf neighbor command.

 Address         Intf               State      ID              Pri  Dead
192.168.254.225  fxp3.0              2Way      10.250.240.32    128   36
192.168.254.230  fxp3.0              Full      10.250.240.8     128   38
192.168.254.229  fxp3.0              Full      10.250.240.35    128   33
10.1.1.129       fxp2.0              Full      10.250.240.12    128   37
10.1.1.131       fxp2.0              Full      10.250.240.11    128   38
10.1.2.1         fxp1.0              Full      10.250.240.9     128   32
10.1.2.81        fxp0.0              Full      10.250.240.10    128   33

Meaning

The output shows a list of the Services Router's OSPF neighbors and their addresses, interfaces, states, router IDs, priorities, and number of seconds allowed for inactivity (“dead” time). Verify the following information:

• Each interface that is immediately adjacent to the Services Router is listed.
• The Services Router's own loopback address and the loopback addresses of any routers with which the Services Router has an immediate adjacency are listed.
• Under State, each neighbor shows a state of Full. Because full OSPF connectivity is established over a series of packet exchanges between clients, the OSPF link might take several seconds to establish. During that time, the state might be displayed as Attempt, Init, or 2way, depending on the stage of negotiation.

  If, after 30 seconds, the state is not Full, the OSPF configuration between the neighbors is not functioning correctly.

Related Topics

For a complete description of show ospf neighbor output, see the JUNOS Routing Protocols and Policies Command Reference.