Cisco OSPF Command and Configuration Handbook (paperback)

21-15 debug ip ospf spf intra access-list-number

Syntax Description:

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

Purpose: To display OSPF shortest path first (SPF) calculations.

Example: Displaying SPF Output for External OSPF Routes

The following is representative output from the debug ip ospf spf external EXEC command.

r4# debug ip ospf spf external OSPF spf external events debugging is on r6# 6w4d: OSPF: Started Building Type 5 External Routes 6w4d: OSPF: Start processing Type 5 External LSA 169.254.0.0, mask 255.254.0.0, adv 4.4.4.4, age 39, seq 0x80000095, metric 10, metric-type 2 6w4d: OSPF: Did not find route to ASBR 4.4.4.4 6w4d: OSPF: ex_delete_old_routes 6w4d: OSPF: Started Building Type 7 External Routes 6w4d: OSPF: ex_delete_old_routes 6w4d: OSPF: Started Building Type 5 External Routes 6w4d: OSPF: Start processing Type 5 External LSA 169.254.0.0, mask 255.254.0.0, adv 4.4.4.4, age 49, seq 0x80000095, metric 10, metric-type 2 6w4d: Add better path to LSA ID 169.254.0.0, gateway 10.1.1.18, dist 10 6w4d: Add path: next-hop 10.1.1.18, interface Serial0/1 6w4d: Add External Route to 169.254.0.0. Metric: 10, Next Hop: 10.1.1.18 6w4d: OSPF: insert route list LS ID 169.254.0.0, type 5, adv rtr 4.4.4.4 6w4d: OSPF: ex_delete_old_routes 6w4d: OSPF: Started Building Type 7 External Routes 6w4d: OSPF: ex_delete_old_routes