21-4 debug ip ospf flood ip-access-list-number

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Syntax Description:

ip-access-list-number ” Number of the IP access list used to filter the output of the flood command. Valid ranges are 1 to 99 and 1300 to 1999.

Purpose: To enable the display of events generated by the OSPF flooding protocol. The debug ip ospf flood command generates information about flooding, which includes the sending and receiving of update and acknowledgement packets.

Example 1: Displaying All Output from the OSPF Flooding Protocol

Debugging the OSPF flooding protocol will generate an enormous amount of information on its operation, as shown in the following output.

 r6#  debug ip ospf flood  OSPF flooding debugging is on r6#  clear ip ospf process  Reset ALL OSPF processes? [no]:  yes  r6# 6w4d: Inc retrans unit nbr count index 1 (0/1) to 1/1 6w4d: Set Nbr 1.1.1.1 1 first flood info from 0 (0) to 623AA2D8 (300) 6w4d: Init Nbr 1.1.1.1 1 next flood info to 623AA2D8 6w4d: OSPF: Add Type 1 LSA ID 6.6.6.6 Adv rtr 6.6.6.6 Seq 80000125 to Serial0/1 1.1.1.1 retransmission list 6w4d: OSPF: Start Serial0/1 1.1.1.1 retrans timer 6w4d: Set idb next flood info from 0 (0) to 623AA2D8 (300) 6w4d: OSPF: Add Type 1 LSA ID 6.6.6.6 Adv rtr 6.6.6.6 Seq 80000125 to Serial0/1 flood list 6w4d: OSPF: Start Serial0/1 pacing timer 6w4d: OSPF: Flooding update on Serial0/1 to 224.0.0.5 Area 7 6w4d: OSPF: Send Type 1, LSID 6.6.6.6, Adv rtr 6.6.6.6, age 3600, seq 0x80000125  (0) 6w4d: Create retrans unit 0x623B71A8/0x623C5DE8 1 (0/1) 1 6w4d: OSPF: Set nbr 1 (0/1) retrans to 4560 count to 1 6w4d: Set idb next flood info from 623AA2D8 (300) to 0 (0) 6w4d: OSPF: Remove Type 1 LSA ID 6.6.6.6 Adv rtr 6.6.6.6 Seq 80000125 from Serial0/1 flood list 6w4d: OSPF: Stop Serial0/1 flood timer 6w4d: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0/1 from FULL to DOWN, Neighbor Down: Interface down or detached 6w4d: Dec retrans unit nbr count index 1 (0/1) to 0/0 6w4d: Free nbr retrans unit 0x623B71A8/0x623C5DE8 0 total 0. Also Free nbr retrans block 6w4d: Set Nbr 1.1.1.1 1 first flood info from 623AA2D8 (300) to 0 (0) 6w4d: Adjust Nbr 1.1.1.1 1 next flood info to 0 6w4d: OSPF: Remove Type 1 LSA ID 6.6.6.6 Adv rtr 6.6.6.6 Seq 80000125 from 1.1.1 .1 retransmission list 6w4d: OSPF: Stop nbr 1.1.1.1 retransmission timer 6w4d: OSPF: Build router LSA for area 7, router ID 6.6.6.6, seq 0x80000001 6w4d: OSPF: received update from 1.1.1.1, Serial0/1 6w4d: OSPF: Rcv Update Type 1, LSID 1.1.1.1, Adv rtr 1.1.1.1, age 5, seq 0x80000 130 6w4d: OSPF: Rcv Update Type 3, LSID 172.16.2.0, Adv rtr 1.1.1.1, age 107, seq 0x 80000001 6w4d:       Mask /24 6w4d: OSPF: Rcv Update Type 3, LSID 172.16.1.0, Adv rtr 1.1.1.1, age 107, seq 0x 80000001 6w4d:       Mask /24 6w4d: OSPF: Rcv Update Type 3, LSID 10.1.1.12, Adv rtr 1.1.1.1, age 107, seq 0x8 0000001 6w4d:       Mask /30 6w4d: OSPF: Rcv Update Type 3, LSID 10.1.1.4, Adv rtr 1.1.1.1, age 107, seq 0x80 000001 6w4d:       Mask /30 6w4d: OSPF: Rcv Update Type 3, LSID 10.1.1.0, Adv rtr 1.1.1.1, age 353, seq 0x80 000110 6w4d:       Mask /30 6w4d: OSPF: Rcv Update Type 3, LSID 8.8.8.0, Adv rtr 1.1.1.1, age 107, seq 0x800 00001 6w4d:       Mask /27 6w4d: OSPF: Rcv Update Type 3, LSID 4.4.4.4, Adv rtr 1.1.1.1, age 107, seq 0x800 00001 6w4d:       Mask /32 6w4d: OSPF: Rcv Update Type 3, LSID 2.2.2.2, Adv rtr 1.1.1.1, age 107, seq 0x800 00001 6w4d:       Mask /32 6w4d: OSPF: Rcv Update Type 3, LSID 1.1.1.1, Adv rtr 1.1.1.1, age 353, seq 0x800 00110 6w4d:       Mask /32 6w4d: OSPF: Rcv Update Type 4, LSID 4.4.4.4, Adv rtr 1.1.1.1, age 107, seq 0x800 00001 6w4d:       Mask /0 6w4d: OSPF: Rcv Update Type 5, LSID 169.254.0.0, Adv rtr 4.4.4.4, age 989, seq 0 x80000090 6w4d:       Mask /15 6w4d: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0/1 from LOADING to FULL, Loading Done ... (many more pages of output!!!)

Example 2: Selective Display of OSPF Protocol Debugging Output

For this example, only flooding protocol information for LSAs with an ID of 172.16.1.0/24 will be displayed.

  access-list 1 permit 172.16.1.0 0.0.0.255  r6#  debug ip ospf flood 1  OSPF flooding debugging is on for access list 1 r6#  clear ip ospf process  Reset ALL OSPF processes? [no]:  yes  r6# 6w4d: Inc retrans unit nbr count index 1 (0/1) to 1/1 6w4d: Set Nbr 1.1.1.1 1 first flood info from 0 (0) to 623AA408 (303) 6w4d: Init Nbr 1.1.1.1 1 next flood info to 623AA408 6w4d: OSPF: Start Serial0/1 1.1.1.1 retrans timer 6w4d: Set idb next flood info from 0 (0) to 623AA408 (303) 6w4d: OSPF: Start Serial0/1 pacing timer 6w4d: Create retrans unit 0x623B71A8/0x623C5DE8 1 (0/1) 1 6w4d: OSPF: Set nbr 1 (0/1) retrans to 4504 count to 1 6w4d: Set idb next flood info from 623AA408 (303) to 0 (0) 6w4d: OSPF: Stop Serial0/1 flood timer 6w4d: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0/1 from FULL to DOWN, Neighbor Down: Interface down or detached 6w4d: Dec retrans unit nbr count index 1 (0/1) to 0/0 6w4d: Free nbr retrans unit 0x623B71A8/0x623C5DE8 0 total 0. Also Free nbr retrans block 6w4d: Set Nbr 1.1.1.1 1 first flood info from 623AA408 (303) to 0 (0) 6w4d: Adjust Nbr 1.1.1.1 1 next flood info to 0 6w4d: OSPF: Stop nbr 1.1.1.1 retransmission timer 6w4d: OSPF: Build router LSA for area 7, router ID 6.6.6.6, seq 0x80000001 6w4d: OSPF: received update from 1.1.1.1, Serial0/1 6w4d: OSPF: Rcv Update Type 3, LSID 172.16.1.0, Adv rtr 1.1.1.1, age 287, seq 0x 80000001 6w4d:       Mask /24 6w4d: %OSPF-5-ADJCHG: Process 1, Nbr 1.1.1.1 on Serial0/1 from LOADING to FULL, Loading Done 6w4d: Inc retrans unit nbr count index 1 (0/1) to 1/1 6w4d: Set Nbr 1.1.1.1 1 first flood info from 0 (0) to 623AA324 (304) 6w4d: Init Nbr 1.1.1.1 1 next flood info to 623AA324 6w4d: OSPF: Start Serial0/1 1.1.1.1 retrans timer 6w4d: Set idb next flood info from 0 (0) to 623AA324 (304) 6w4d: OSPF: Start Serial0/1 pacing timer 6w4d: OSPF: Build router LSA for area 7, router ID 6.6.6.6, seq 0x80000002 6w4d: Create retrans unit 0x623B71A8/0x623C5DE8 1 (0/1) 1 6w4d: OSPF: Set nbr 1 (0/1) retrans to 4568 count to 1 6w4d: Set idb next flood info from 623AA324 (304) to 0 (0) 6w4d: OSPF: Stop Serial0/1 flood timer 6w4d: Update router LSA 6.6.6.6 6.6.6.6 1 80000126 6w4d: OSPF: Rate limit LSA generation for 6.6.6.6 6.6.6.6 1 6w4d: OSPF: Sending delayed ACK on Serial0/1 6w4d: OSPF: Ack Type 3, LSID 172.16.1.0, Adv rtr 1.1.1.1, age 287, seq 0x8000000 1 6w4d: OSPF: Set nbr 1 (0/1) retrans to 4960 count to 2 6w4d: Set Nbr 1.1.1.1 1 next flood info from 623AA324 (304) to 623AA324 (304) 6w4d: Dec retrans unit nbr count index 1 (0/1) to 0/0 6w4d: Free nbr retrans unit 0x623B71A8/0x623C5DE8 0 total 0. Also Free nbr retrans block ns block 6w4d: Adjust Nbr 1.1.1.1 1 next flood info to 0 6w4d: OSPF: Stop nbr 1.1.1.1 retransmission timer 6w4d: Inc retrans unit nbr count index 1 (0/1) to 1/1 6w4d: Set Nbr 1.1.1.1 1 first flood info from 0 (0) to 623AA324 (305) 6w4d: Init Nbr 1.1.1.1 1 next flood info to 623AA324 6w4d: OSPF: Start Serial0/1 1.1.1.1 retrans timer 6w4d: Set idb next flood info from 0 (0) to 623AA324 (305) 6w4d: OSPF: Start Serial0/1 pacing timer 6w4d: OSPF: Build router LSA for area 7, router ID 6.6.6.6, seq 0x80000127 6w4d: Create retrans unit 0x623B71A8/0x623C5DE8 1 (0/1) 1 6w4d: OSPF: Set nbr 1 (0/1) retrans to 4576 count to 1 6w4d: Set idb next flood info from 623AA324 (305) to 0 (0) 6w4d: OSPF: Stop Serial0/1 flood timer 6w4d: OSPF: Set nbr 1 (0/1) retrans to 4596 count to 2 6w4d: Set Nbr 1.1.1.1 1 next flood info from 623AA324 (305) to 623AA324 (305) 6w4d: Dec retrans unit nbr count index 1 (0/1) to 0/0 6w4d: Free nbr retrans unit 0x623B71A8/0x623C5DE8 0 total 0. Also Free nbr retra ns block 6w4d: Set Nbr 1.1.1.1 1 first flood info from 623AA324 (305) to 0 (0) 6w4d: Adjust Nbr 1.1.1.1 1 next flood info to 0 6w4d: OSPF: Stop nbr 1.1.1.1 retransmission timer

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