BGP Optional Transitive Attribute for Advertising GPU and AI Accelerator Capabilities

This document defines a new BGP path attribute, GPU_CAPABILITY, to allow network devices to advertise the availability, capacity, and characteristics of GPU and AI accelerators within a data center or AI fabric. This optional, transitive attribute enables schedulers, orchestration systems, and control-plane applications to discover GPU resources directly through BGP, integrating resource-awareness into routing and placement decisions. The attribute is TLV-based, extensible, and vendor-neutral.