This holds the configured Endpoint Discriminator (EPD) value for this multilink PPP member link, used to identify the local endpoint during multilink negotiation. Admins set it when the far-end device requires an endpoint discriminator to correctly group member links into the same bundle, and it reads back "N/A" if none has been configured. An admin troubleshooting a link that won't join its expected bundle might check whether this reads "N/A" when the remote peer expects a configured EPD value.