Reference Guide

● Is OSPF enabled on the interface?
● Are adjacencies established correctly?
● Are the interfaces configured for L3 correctly?
● Is the router in the correct area type?
● Are the OSPF routes included in the OSPF database?
● Are the OSPF routes included in the routing table in addition to the OSPF database?
● Are you able to ping the IPv4 address of adjacent router interface?
Troubleshooting OSPF with show commands
● View a summary of all OSPF process IDs enabled in EXEC mode.
show running-configuration ospf
● View summary information of IP routes in EXEC mode.
show ip route summary
● View summary information for the OSPF database in EXEC mode.
show ip ospf database
● View the configuration of OSPF neighbors connected to the local router in EXEC mode.
show ip ospf neighbor
● View routes that OSPF calculates in EXEC mode.
show ip ospf routes
View OSPF configuration
OS10# show running-configuration ospf
!
interface ethernet1/1/1
ip ospf 100 area 0.0.0.0
!
router ospf 100
log-adjacency-changes
OSPFv2 commands
area default-cost
Sets the metric for the summary default route generated by the ABR and sends it to the stub area. Use the area default-
cost command on the border routers at the edge of a stub area.
Syntax
area area-id default-cost cost
Parameters
● area-id — Enter the OSPF area in dotted decimal format (A.B.C.D.) or enter a number (0 to
65535).
● cost — Enter a cost for the stub area’s advertised external route metric (0 to 65535).
Default Cost is 1
Command Mode ROUTER-OSPF
Usage
Information
The cost is also referred as reference-bandwidth or bandwidth. The no version of this command resets
the value to the default.
Example
OS10(conf-router-ospf-10)# area 10.10.1.5 default-cost 10
Supported
Releases
10.2.0E or later
392 Layer 3