Supported scenarios for DNS-based MME discovery

Supported scenarios:

  • DNS-based MME discovery is available for both idle mode (registration with 4G GUTI) and connected mode (handover to EPC) mobility procedures.

  • Both IPv4 and IPv6 MMEs can be selected, depending on the AMF’s local endpoint configuration.

  • If DNS resolution fails, AMF falls back to static peer MME configuration.

  • When multiple IPs are received in a DNS response, AMF selects one IP address.

If the DNS discovery feature is enabled, the AMF prefers the IP addresses resolved from the DNS server.

Configure DNS-based MME discovery

Enable and manage dynamic peer MME selection for the AMF using DNS queries.

Use this configuration to allow AMF to discover peer MMEs dynamically via DNS, or to revert to static configuration as needed.

Follow these steps to configure DNS-based MME discovery:

Procedure

Step 1

Enter the AMF service configuration mode.

amf-services amf_service_name

Step 2

Enable DNS-based peer MME discovery.

peer-mme dns-discovery enabled

Step 3

Save and commit the configuration.