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Ask the Expert- SD-WAN

OSPF show commands respond slowly

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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.


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