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Displaying and Maintaining DNS
To do… Use the command… Remarks
Display static DNS database
display ip host
Display the DNS server
information
display dns server [ dynamic ]
Display the DNS suffixes display dns domain [ dynamic ]
Display the information in the
dynamic domain name cache
display dns dynamic-host
Available in any view
Display the DNS resolution result
nslookup type { ptr ip-address | a
domain-name }
Available in any view
Clear the information in the
dynamic domain name cache
reset dns dynamic-host
Available in user view
Troubleshooting DNS Configuration
Symptom
After enabling the dynamic domain name resolution, the user cannot get the correct IP address.
Solution
z Use the display dns dynamic-host command to check that the specified domain name is in the
cache.
z If there is no defined domain name, check that dynamic domain name resolution is enabled and the
DNS client can communicate with the DNS server.
z If the specified domain name exists in the cache but the IP address is incorrect, check that the DNS
client has the correct IP address of the DNS server.
z Check that the mapping between the domain name and IP address is correct on the DNS server.
