Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

OSPF show commands respond slowly

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.


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.

Version history
Revision #:
1 of 1
Last update:
‎06-22-2009 03:35 PM
Updated by:
Labels (1)
Everyone's tags (5)