Debug information analysis of OSPF

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Debug information analysis of OSPF

To learn about computer networks, if you want to learn more deeply and master the skills, you must learn to view the Debug information. This is currently the only query tool that can see the route protocol trend. Enable Debug test information:

 
 

  
  
R1 # debug ip ospf the debug of OSPF neighbor Information
  
  
 
  
  
OSPF adjacency events debugging is on
  
  
 
  
  
R1 # clear ip ospf process restart OSPF neighbor Calculation
  
  
 
  
  
Reset all ospf processes? [No]: y
 
 

 
 

  
  
R1 #
  
  
 
  
  
01: 12: 04: OSPF: Interface Serial1/0 going Down Interface reset to down
  
  
 
  
  
01: 12: 04: OSPF: 1.1.1.1 address 199.99.1.1 on Serial1/0 is dead, state DOWN
  
  
 
  
  
01: 12: 04: OSPF: 2.2.2.2 address 199.99.1.2 on Serial1/0 is dead, state DOWN
  
  
 
  
  
01: 12: 04: % OSPF-5-ADJCHG: Process 100, Nbr 2.2.2.2 on Serial1/0 from FULL to DOWN, Neighbor Down: Interface down or detached
 
 

 
 

  
  
R1 #
  
  
 
  
  
01: 12: 04: OSPF: Interface Loopback0 going Down
  
  
 
  
  
01: 12: 04: OSPF: 1.1.1.1 address 1.1.1.1 on Loopback0 is dead, state DOWN
  
  
 
  
  
01: 12: 04: OSPF: Interface Serial1/0 going Up Interface start UP
  
  
 
  
  
01: 12: 04: OSPF: Interface Loopback0 going Up
  
  
 
  
  
01: 12: 05: OSPF: Build router LSA for area 0, router ID 1.1.1.1, seq 0x80000001 calculation of local route ID and process serial number
 
 

 
 

  
  
R1 #
  
  
 
  
  
01: 12: 08: OSPF: 2 Way Communication to 2.2.2.2 on Serial1/0, state 2WAY route 2WAY status calculated by OSPF
  
  
 
  
  
01: 12: 08: OSPF: Send DBD to 2.2.2.2 on Serial1/0 seq 0x1968 opt 0x42 flag 0x7 len 32 Send your own DBD database to the neighbor
  
  
 
  
  
01: 12: 08: OSPF: Rcv DBD from 2.2.2.2 on Serial1/0 seq 0x2234 opt 0x42 flag 0x7
  
  
 
  
  
Received the message of the DBD database, which contains the process serial number, type field, and tag of the database.
  
  
 
  
  
Len 32 mtu 1500 state EXSTART enters starting state
  
  
 
  
  
01: 12: 08: OSPF: NBR Negotiation Done.
  
  
 
  
  
01: 12: 08: OSPF: Send DBD to 2.2.2.2 on Serial1/0 seq 0x2234 opt 0x42 flag 0x2 len 52
  
  
 
  
  
01: 12: 08: OSPF: Rcv DBD from 2.2.2.2 on Serial1/0 seq 0x2235 opt 0x42 flag 0x3 len 72 mtu 1500 state EXCHANGE
  
  
 
  
  
01: 12: 08: OSPF: Send DBD to 2.2.2.2 on Serial1/0 seq 0x2235 opt 0x42 flag 0x0 len 32
  
  
 
  
  
01: 12: 08: OSPF: Database request to 2.2.2.2 Data request
  
  
 
  
  
01: 12: 08: OSPF: sent ls req packet to 199.99.1.2, length 24
  
  
 
  
  
01: 12: 08: OSPF: Rcv DBD from 2.2.2.2 on Serial1/0 seq 0x2236 opt 0x42 flag 0x1 len 32 mtu 1500 state EXCHANGE state change to switch state
  
  
 
  
  
01: 12: 08: OSPF: Exchange Done with 2.2.2.2 on Serial1/0
  
  
 
  
  
01: 12: 08: OSPF: Send DBD to 2.2.2.2 on Serial1/0 seq 0x2236 opt 0x42 flag 0x0 len 32
  
  
 
  
  
01: 12: 08: OSPF: Synchroni
 
 

 
 

  
  
R1 # zed with 2.2.2.2 on Serial1/0, state FULL
  
  
 
  
  
01: 12: 08: % OSPF-5-ADJCHG: Process 100, Nbr 2.2.2.2 on Serial1/0 from LOADING to FULL, Loading Done
  
  
 
  
  
R1 #
  
  
 
  
  
01: 12: 11: OSPF: Build router LSA for area 0, router ID 1.1.1.1, seq 0x80000002
 
 

There is still a lot of information about OSPF. We will continue to introduce it to you and hope you can learn more.

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1. Result Analysis of router OSPF Configuration
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3. Describes the basic interface configuration for router OSPF configuration.
4. Test interface connectivity for router OSPF Configuration
5. Describes how to query the OSPF neighbor table on a router in the OSPF configuration of a router.
6. Describes the basic configuration and connectivity test of OSPF in Router OSPF configuration.
7. Describes how to query the connection status database of ospf on a Router Based on the OSPF configuration of a router.