In ERP, ERNs send R-APS messages. For details about the packet structures, see ITU-T G.8032.
The destination MAC address (Dst Mac) is the first element in the packet and is of the form 01-19-A7-00-00-<ERP ID>. The default value is 01. However, you can configure the ERP ID with the raps-default-mac command. In ITU-T G.8032 Version 1 the default value is always used.
The Node ID indicates the base MAC address and can be found in the R-APS specific information part of a R-APS message.