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show ip ospf [process-id area-id] database show ip ospf [process-id area-id]
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Table 26-12: Theshow ip ospf database Command Permutations Description ID to show a specific LSA Shows network (Type 2) LSAs Append the link-state ID to show a specific LSA Shows network summary (Type 3) LSAs Append the link-state ID to show a specific LSA
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database router [link-state-id] show ip ospf [process-id area-id] database network [link-state-id] show ip ospf [process-id area-id] database summary [link-state-id]
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Shows ASBR summary (Type 4) LSAs Append the show ip ospf [process-id area-id] database asb-summary [link-state-id] link-state ID to show a specific LSA Shows NSSA external (Type 7) LSAs Append the show ip ospf [process-id area-id] database nssa-external [link-state-id] link-state ID to show a specific LSA show ip ospf [process-id] database external [link-state-id] Shows AS external (Type 5) LSAs Append the linkstate ID to show a specific LSA
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The show ip ospf interface command shows OSPF information specific to each router interface (such as area membership, interface type, state, and so on), as shown here:
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Router# show ip ospf interface Ethernet 0/0 Ethernet 0/0 is up, line protocol is up Internet Address 19216811, Mask 2552552550, Area 0000 AS 1, Router ID 19216811, Network Type BROADCAST, Cost: 10 Transmit Delay is 1 sec, State OTHER, Priority 1 Designated Router id 192168110, Interface address 192168110 Backup Designated router id 192168120, Interface addr 192168120 Timer intervals configured, Hello 10, Dead 60, Wait 40, Retransmit 5 Hello due in 0:00:02 Neighbor Count is 14, Adjacent neighbor count is 2 Adjacent with neighbor 192168120 (Backup Designated Router) Adjacent with neighbor 192168110 (Designated Router)
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The show ip ospf neighbor command is another command with lots of interesting options The base version of the command shows a summary of all neighbors, like so:
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Router# show ip ospf neighbor ID Pri State Dead Time Address Interface 192168110 20 FULL/DR 0:00:31 192168110 Ethernet0/0 192168120 10 FULL/BDR 0:00:33 192168120 Ethernet0/0
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If you want to see information on a specific neighbor, append the neighbor's router ID to the end of the command, like so:
Router# show ip ospf neighbor 192168110 Neighbor 192168110, interface address 192168110 In the area 0000 via interface Ethernet0/0 Neighbor priority is 20, State is FULL Options 2 Dead timer due in 0:00:34 Link State retransmission due in 0:00:04
You can also have the command show all neighbors attached to a specific interface by appending the interface name and number to the end of the command Finally, you can show detailed information on all neighbors (the same information shown with the show ip ospf neighbor [neighbor ID] version of the command) by appending the detail modifier to the command The show ip ospf request-list and show ip ospf retransmission-list commands show you the SPF request and retransmission lists, respectively:
router# show ip ospf request-list OSPF Router with ID (19216811) (Process ID 1) Neighbor 192168110, interface Ehternet0/0 address 19216811 Type LS ID ADV RTR Seq NO Age Checksum 1 192168110 192168110 0x80000111 8 0x4123 Router# show ip ospf retransmission-list OSPF Router with ID (19216811) (Process ID 1) Neighbor 192168110, interface Ehternet0/0 address 19216811 Link State retransmission due in 3472 msec, Queue length 1 Type LS ID ADV RTR Seq NO Age Checksum 1 192168110 192168110 0x80000A1A 0 0xAFEF
The show ip ospf summary-address command shows all configured summary addresses on the ASBR, like so:
Router# show ip ospf summary-address OSPF Process 1, Summary-address 10000/255000 Metric 1000, Type 0, Tag 0
The show ip ospf virtual-links command, as the name might suggest, shows configured virtual links on the local router, like so:
Router# show ip ospf virtual-links Virtual Link to router 19216811 is up Transit area 0004, via interface Ethernet0/0, Cost of using 10 Transmit Delay is 1 sec, State POINT_TO_POINT Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 0:00:03 Adjacency State FULL
The debug commands, as is normal with debugs, show extremely detailed information on OSPF events and packets As always, debugs are best used only when absolutely necessary because of the high processor use they can cause For adjacency monitoring, instead of debugging adjacencies, the ospf log-adj-changes command can give you basic adjacency change information without extremely high processor use Once enabled, this command logs all adjacency changes to the configured syslog location(s) Once you've verified OSPF operation, if you are still having problems, use the following tips:
Ensure that the problem is not related to basic connectivity issues (link problems, IP addressing problems, and so on) If adjacencies aren't forming correctly, ensure the following: o OSPF is enabled on the interface (show ip ospf interface) and is not a passive interface o OSPF hello parameters (subnet mask, area ID, stub flags, hello intervals, and authentication keys) are identical on both routers (The debug ip ospf adj command is useful for this purpose) If the router's state is stuck in an attempt for one or more neighbors, ensure that there are no transient connectivity issues (Perform a show interface and look for packet loss or perform a continuous ping) If networks are listed in the OSPF database but do not show up in the routing table, check for mismatched network types (ie, one router set to broadcast and the other set to point-to-point) with show ip ospf interface If a default route is not being redistributed properly, ensure that the defaultinformation originate command is entered on the ASBR If SPF is taking up too much processor use, ensure that the timers are not set too low and make sure routes are summarized If routes are not being advertised between areas properly (Type 5 LSAs), ensure that all areas have a connection to Area 0 If an inefficient path is being chosen to an external destination, ensure that all ASBRs redistributing the external route are advertising E1 routes (or N1 routes, in the case of an NSSA)
Although these tips will not solve every problem, they will help you identify some of the more common OSPF issues Remember, most routing problems actually stem from misconfigurations Use the troubleshooting commands discussed in this chapter to narrow down the problem, and then zero in on the cause
Summary
This chapter examined OSPF at a detailed level You should have acquired a solid understanding of OSPF operation, configuration, and basic troubleshooting For more information on OSPF, be sure to check out RFC 2328 at ftp://ftpisiedu/in-notes/rfc2328txt For Cisco-specific OSPF information, be sure to check out http://wwwciscocom/univercd/ cc/td/doc/product/software/ ios122/122cgcr/fipr_c/ ipcprt2/1cfospfhtm The final chapter examines access lists and network security
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