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1.4 Troubleshoot these network components in a Cisco Collaboration solution

1.4 Troubleshoot these network components in a Cisco Collaboration solution

  • 1.4.a DNS (A/AAA, SRV, Reverse Pointer Record (PTR))

  • 1.4.b NTP

  • 1.4.c LDAP integration on Cisco Unified Communications Manager



DNS (A/AAA, SRV, Reverse Pointer Record (PTR))

  • DNS is used to resolve domain names to IP addresses and vice versa.

  • To troubleshoot DNS issues, it's important to check the DNS server configuration, the DNS client configuration, and the network connectivity between the client and the server.

  • DNS records, such as A (Address), AAAA (IPv6 Address), SRV (Service), and Reverse Pointer Record (PTR) can also cause issues if not properly configured.

DNS, if used, can also contribute to failed communication with the call control servers resulting in a failed registration attempt. DNS can be unavailable or unreachable in the IP network.

DNS can also be misconfigured, meaning that it resolves names to incorrect IP addresses. If a DNS server is used to address Cisco Unified Communications servers, you should verify that the DNS server resolves names to correct IP addresses.

To verify name resolution, use the ns lookup command followed by the DNS name of the Cisco Unified Communications Manager and Cisco TFTP server, if a separate TFTP exists, instead of the IP address.

Remember that this test must be performed from the same VLAN that is used for voice and video devices. Otherwise, the verification procedure does not check IP connectivity to the DNS server.

If names do not resolve at all, ping the DNS server by its IP address. If no response is received, troubleshoot IP connectivity to the DNS server. If names resolve to incorrect IP addresses, check and correct the DNS database. If DNS names resolve to correct IP addresses but no response to the ping is received, troubleshoot IP connectivity to Cisco Unified Communications Manager and the Cisco TFTP server.




NTP: Network Time Protocol

  • NTP is used to synchronize the clocks of network devices, ensuring that they all have the same time.

  • To troubleshoot NTP issues, it's important to check the NTP server configuration, the NTP client configuration, and the network connectivity between the client and the server.




LDAP (Lightweight Directory Access Protocol) integration on Cisco Unified Communications Manager

  • LDAP is used to manage and organize user information in a centralized database.

  • To troubleshoot LDAP integration issues on Cisco Unified Communications Manager, it's important to check the LDAP server configuration, the LDAP client configuration on the Cisco Unified Communications Manager, and the network connectivity between the two devices.

  • Additional issues may arise from incorrect LDAP settings or incorrect user information in the LDAP database.






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