# Configuring Topology Discovery

You use the discovery-mode command to enable the dynamic discovery of access topology. When ANCP discovery is enabled, an authentication server (like RADIUS) retrieves upstream and downstream access loop information from the configured access node.

For information about configuring RADIUS, see JunosE Broadband Access Configuration Guide.

discovery-mode

- Use to enable ANCP discovery for a neighbor.
- Example
  host1(l2c-neighbor)#discovery-mode
- Use the no version to disable discovery mode.
- See discovery-mode.