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There are several OSPF commands that are useful for examining the state of OSPF on a router. For the following command output, the network shown in Figure 9.7 will be used.
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Figure 9.7 A sample network topology. For the examples that follow, only routers R1, R2, R3, R5, and R7 have been enabled for OSPF.
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We can first examine the interfaces on router r1 in Figure 9.7 to determine what interfaces exist and what interfaces have OSPF configured. The commands, respectively, are show router interface and show router ospf interface. The output from each command is shown in Listing 9.1.
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Listing 9.1 The output of show router interface and show router ospf interface commands
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*A:AIRP_R01>show>router# interface ============================================================================ Interface Table (Router: Base) ============================================================================ Interface-Name Adm Opr(v4/v6) Mode Port/SapId IP-Address PfxState ---------------------------------------------------------------------------L1 Up Up/-Network loopback 172.16.2.1/24 n/a
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172.16.3.1/24 system Up Up/-Network system 172.16.1.1/32 n/a toR2 Up Up/-Network 1/1/2 172.31.12.1/24 n/a toR3 Up Up/-Network 1/1/3 172.31.13.1/24 n/a toR4 Up Up/-Network 1/1/4 172.31.14.1/24 n/a toR5 Up Up/-Network 1/1/1 172.16.15.1/24 n/a ---------------------------------------------------------------------------Interfaces : 7 ============================================================================ *A:AIRP_R01>show>router# *A:AIRP_R01>show>router>ospf# interface ============================================================================ OSPF Interfaces ============================================================================ If Name Area Id Designated Rtr Bkup Desig Rtr Adm Oper ---------------------------------------------------------------------------toR5 0.0.0.0 0.0.0.0 0.0.0.0 Up PToP toR2 0.0.0.0 0.0.0.0 0.0.0.0 Up PToP toR3 0.0.0.0 0.0.0.0 0.0.0.0 Up PToP toR4 0.0.0.0 0.0.0.0 0.0.0.0 Up PToP ---------------------------------------------------------------------------No. of OSPF Interfaces: 4 ============================================================================= *A:AIRP_R01>show>router>ospf#
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There are several points of interest in the output of these commands. First, note that the number of interfaces on r1 is seven and the number of interfaces for OSPF is four. not all active interfaces on r1 are configured for OSPF. The Oper flag for the toR2, toR3, toR4, and toR5 interfaces indicate that the interfaces are point-to-point (PToP). Because the interfaces are Ethernet, this means that the interfaces have been explicitly configured as OSPF point-to-point. (You will see how to do this later in the chapter.) How do you know that the interfaces are Ethernet The easiest way is
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to use the show port command and examine the output for ports 1/1/1, 1/1/2, 1/1/3, and 1/1/4 (the ports that correspond to the OSPF enabled interfaces). The output of this command is shown in Listing 9.2. You can see that the port type is faste, that is, fastethernet.
Listing 9.2 Listing of the show port command
*A:AIRP_R01# show port =========================================================================== = Ports on Slot 1 =========================================================================== = Port Admin Link Port Cfg Oper LAG/ Port Port Port SFP/XFP/ Id State State MTU MTU Bndl Mode Encp Type MDIMDX --------------------------------------------------------------------------1/1/1 Up Yes Up 1514 1514 - netw null faste MDI 1/1/2 Up Yes Up 1514 1514 - netw null faste MDI 1/1/3 Up Yes Up 1514 1514 - netw null faste MDI 1/1/4 Up Yes Up 1514 1514 - netw null faste MDI 1/1/5 Down No Down 1514 1514 - netw null faste 1/1/6 Down No Down 1514 1514 - netw null faste 1/1/7 Down No Down 1514 1514 - netw null faste 1/1/8 Down No Down 1514 1514 - netw null faste 1/1/9 Down No Down 1514 1514 - netw null faste 1/1/10 Down No Down 1514 1514 - netw null faste 1/1/11 Down No Down 1514 1514 - netw null faste 1/1/12 Down No Down 1514 1514 - netw null faste 1/1/13 Down No Down 1514 1514 - netw null faste 1/1/14 Down No Down 1514 1514 - netw null faste 1/1/15 Down No Down 1514 1514 - netw null faste 1/1/16 Down No Down 1514 1514 - netw null faste 1/1/17 Down No Down 1514 1514 - netw null faste 1/1/18 Down No Down 1514 1514 - netw null faste 1/1/19 Down No Down 1514 1514 - netw null faste 1/1/20 Down No Down 1514 1514 - netw null faste 1/1/21 Down No Down 1514 1514 - netw null faste 1/1/22 Down No Down 1514 1514 - netw null faste
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