(Optional) Configuring LDP to Automatically Trigger the Request in DoD Mode

Context

On a large-scale network, the label advertisement mode is set to downstream on demand (DoD) to reduce the workload of edge devices. Because edge devices cannot learn the accurate route to each other, an LDP LSP cannot be set up even if LDP extensions for inter-area LSPs are configured. You can configure LDP to automatically trigger the request in DoD mode to request the Label Mapping message from a specified downstream LSR or all LSRs for LDP LSP establishment.

Before configuring LDP to automatically trigger the request in DoD mode, perform the following operations:

Configure a remote LDP session according to Configuring Basic Functions of MPLS LDP.
Configure LDP extensions for inter-area LSPs according to Configuring LDP Extensions for Inter-Area LSPs.
Configure the DoD mode according to (Optional) Configuring an LDP Label Advertisement Mode.

Procedure

Configure automatic triggering of requests for Label Mapping messages in DoD mode from all downstream remote LDP peers.
1. Run system-view
  The system view is displayed.
2. Run mpls ldp
  The MPLS LDP view is displayed.
3. Run remote-peer auto-dod-request
  LDP is configured to automatically trigger requests for Label Mapping messages in DoD mode from all downstream remote LDP peers.
  
  By default, the device does not automatically trigger requests for Label Mapping messages in DoD mode from all downstream remote LDP peers.
Configure automatic triggering of a request for a Label Mapping message in DoD mode from a downstream remote LDP peer with a specified LSR ID.
1. Run system-view
  The system view is displayed.
2. Run mpls ldp remote-peer remote-peer-name
  A remote MPLS LDP peer is created and the remote MPLS LDP peer view is displayed.
3. Run remote-ip auto-dod-request [ block ]
  LDP is configured to automatically trigger a request for a Label Mapping message in DoD mode from a downstream remote LDP peer with a specified LSR ID.
  
  By default, the configuration of the remote-peer auto-dod-request command is inherited.
  
  If the remote-peer auto-dod-request command is enabled in the system view, you can specify block to disable automatic triggering of a request for a Label Mapping message in DoD mode from a downstream remote LDP peer of a specified LSR ID.