Subject: Proposal to Augment draft-ietf-opsawg-ipfix-on-path-telemetry-14 with
Throughput and Congestion Metrics
Dear OPSAWG Members,
I want to express my appreciation for the excellent work on
draft-ietf-opsawg-ipfix-on-path-telemetry-14. The detailed IPFIX Information
Elements (IEs) for delay performance metrics provide significant value to
network operators and represent a strong foundation for real-time performance
monitoring.
I am writing to propose an augmentation to the draft by incorporating
throughput and congestion metrics. These additional metrics would complement
the existing delay-focused IEs and enable network operators to correlate delay
performance with throughput bottlenecks and congestion points, providing a more
holistic view of network behavior.
Proposal Overview
The draft currently focuses on delay performance metrics such as
pathDelayMeanDeltaMicroseconds and pathDelayMaxDeltaMicroseconds. While these
are critical for delay monitoring, they do not address throughput or
congestion, which are often the root causes of delays. I propose defining
unique Information Elements (IEs) for throughput and congestion metrics to
complement the existing delay metrics and provide operators with actionable,
real-time insights into network performance.
Proposed Unique IEs
To extend the draft’s IPFIX template, I propose adding the following unique IEs:
| IE Name | Description |
Type | Units |
|-----------------------|--------------------------------------------------|-----------------|--------------------|
| PacketsPerSecond | Number of packets transmitted per second |
Float/Integer | Packets/second |
| BitsPerSecond | Number of bits transmitted per second |
Float/Integer | Bits/second |
| CongestionDetectedFlag| Boolean flag indicating if congestion detected |
Boolean | N/A |
| CongestionStartTime | Timestamp when congestion began |
DateTime | Seconds since epoch|
| CongestionEndTime | Timestamp when congestion ended |
DateTime | Seconds since epoch|
| CongestionDirection | Indicates congestion direction: ingress/egress |
Integer/Enum | 1 = ingress, 2 = egress |
Advantages of the Proposed Enhancements
By incorporating throughput and congestion metrics into the draft, operators
will benefit from:
• Enhanced Correlation: Correlate delay performance with
throughput bottlenecks and congestion issues, offering deeper insights into the
root causes of performance degradation.
• Holistic Network View: Gain a comprehensive perspective on
network performance, enabling operators to monitor and troubleshoot delay
issues alongside throughput and congestion in real time.
• Reduced Collector Overhead: Pre-calculated pps and bps metrics
exported directly from devices reduce the processing burden on collectors,
improving scalability in high-traffic environments.
• Improved Troubleshooting: Real-time access to these metrics
enables faster diagnosis and resolution of performance issues.
• Simplified Export: Consolidating delay, throughput, and
congestion metrics into a unified IPFIX template reduces operational complexity
and export overhead.
I believe that incorporating these additional metrics into the draft aligns
with its objectives and significantly enhances its utility for network
operators. I would be honored to collaborate further on refining these
enhancements and contributing to the draft as a co-author.
Please let me know your thoughts on this proposal.
Regards
yp
Juniper Business Use Only
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