[Cats] new CATS drafts
张宾 <zhangb@pcl.ac.cn> Wed, 05 August 2026 00:57 UTC
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Subject: [Cats] new CATS drafts
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Dear All,
We recently submitted two new Internet-Drafts.
One is CATS Service Contact Instance Functional Implementation.This document defines the functional implementation of a CATS Service Contact Instance(SCI). The SCI acts as the boundary between the CATS-aware network and the service site. It is responsible for:
* Collecting per-service-instance metrics (CPU, memory, GPU, throughput, queue depth, etc.).
* Aggregating these metrics into service-oriented abstractions (e.g., Global Available Slots, Computing Time) as defined in [I-D.zhangb-cats-service-metrics-op].
* Monitoring service instance health and adjusting reported metrics accordingly.
* Receiving client requests from the Egress CATS-Forwarder and dispatching them to the most suitable service instance.
* Reporting aggregated metrics and status to the C-SMA.
Link: draft-zhangb-cats-sci-implementation-00 - CATS Service Contact Instance Functional Implementation
Another is CATS Service Metric Agent (C-SMA) Functional Implementation. This document defines the functional implementation of the C-SMA. The C-SMA acts as the bridge between the service site (and its SCIs) and the CATS control plane. It is responsible for:
* Collecting metrics from one or more SCIs within the service site.
* Validating and sanitizing metrics to prevent erroneous or malicious data from influencing traffic steering.
* Caching metrics and maintaining soft-state to handle transient failures.
* Adapting to the control-plane protocol used in the deployment (RESTful API, BGP-LS, GRASP, etc.).
* Enforcing local policies (e.g., metric transformation, update throttling, security labels).
* Authenticating SCIs and C-PSes, and protecting metric integrity.
* Handling failures of SCIs, C-PSes, and network partitions.
Link: draft-zhangb-cats-csma-implementation-00 - CATS Service Metric Agent (C-SMA) Functional Implementation
We believe the two drafts will fill important gaps in CATS.
We welcome any feedback on the mailing list.
Best regards,
Bin Zhang
Pengcheng Lab