OSPF show commands respond slowly

[TCC_2]

Core Issue

Output from these commands appear line by line and take between 15 to 20 seconds before the next line appears:

• show ip ospf border-routers
• show ip ospf database
• show ip ospf interface
• show ip ospf neighbor

These are the most common reasons for this issue:

• The router does an IP domain lookup by broadcasting the User Datagram Protocol (UDP) packets with a destination port of 53.
• The router waits for the Domain Name System (DNS) server to respond to its domain lookup queries.

Resolution

To resolve this issue, perform one of these options:

• Determine why the DNS server is unreachable (or not responding).
• Disable the Open Shortest Path First (OSPF) name-lookup feature by issuing the no ip ospf name-lookup command.

For more information on how to determine why the DNS server is unreachable (or not responding), refer to OSPF show Commands Respond Slowly.