LLRP Network Configuration

LLRP Network Configuration

LLRP (Low Level Recovery Protocol) is part of the E1.33 (RDMNet) standard. It allows you to discover and configure the network settings of RDM fixtures directly — even when they don't have a valid IP address yet.

When to Use LLRP

• A fixture has lost its IP configuration and is unreachable via Art-Net
• You need to set a static IP or enable DHCP on a fixture
• You want to verify network settings across multiple fixtures
• A fixture is on a wrong subnet and needs reconfiguration

Starting LLRP Discovery

1. Go to the RDMNet tab
2. Select the LLRP section
3. Choose the network interface to use — only Ethernet adapters are shown (WiFi, VPN, tunnels are filtered)
4. Click Start

LLRP sends multicast probes every 2 seconds on 239.255.250.133 and 239.255.250.134 with TTL=1 (link-local only, so traffic stays on the local segment).

Discovered Targets

The target table shows all LLRP-capable devices on the selected interface. For each target:

• Manufacturer and Model names
• Device Label
• UID — the RDM unique identifier
• CID — the E1.33 Component Identifier

When you select a target, DMXRouter automatically queries SUPPORTED_PARAMETERS and only requests PIDs the device actually supports, avoiding unnecessary NACKs.

Reading Device Info

Selecting a target automatically fetches:

• Device label, manufacturer, and model
• Current IP address and DHCP mode
• Static IP, subnet mask, and gateway configuration
• Identify state

Controls for unsupported features (DMX address, personality) are automatically disabled.

Network Configuration

The network configuration panel shows:

• Current IP — the device's active IP address
• DHCP — checkbox to enable/disable DHCP
• Static IP — the configured static address
• Subnet Mask — the configured mask
• Gateway — the configured gateway

When DHCP is active, the static fields are visually dimmed.

Applying Changes

1. Modify the static IP, mask, gateway, or DHCP toggle
2. Click Apply
3. A confirmation dialog warns you that applying changes could make the device unreachable if the new IP is on a different subnet

DMXRouter re-reads the device IP twice after applying (at 1s and 4s) to catch DHCP lease assignments that take a few seconds.

Identify

The Identify button toggles identify mode on the selected LLRP target. Devices in identify mode show an amber highlight in the target table, matching the RDM device tree visual style.