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