Telemetry provides a way to stream state changes from network devices in real-time, avoiding the missing data problem of polling. It allows visualizing the state of interfaces and other metrics on a network topology map. The document discusses how Arista has combined telemetry data with topology maps to create a "network weather map" that makes telemetry data more intuitive and powerful for monitoring network state.

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How to create Telemetry Corrector
Shishio Tsuchiya
shtsuchi@arista.com

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State Streaming – Goodbye SNMP!
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Every state change. From every device. Instantaneously.
Interface Counters
sFlow Data
Temperature Sensor
Routing Tables
MAC Tables ACL Counters
Buffer Utilization
System logs
CPU Load
Fan Speed
Power Draw
VXLAN Mappings
State Streaming
Every state change triggers
an update…
LANZ Data
Table Utilization
Configurations
…and streamed to a
central state
repository
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Polling Data == Missing Data
Intf
down
Intf
up
Switch
State
Intf
up
Polled
State
Intf
up
Intf
up
Intf
up
Intf
up
Intf
up
Intf
down
Intf
up
Streamed
State
Intf
up
12:00PM 12:01PM 12:02 PM 12:03 PM 12:04 PM 12:05 PM
12:00PM 12:01PM 12:02 PM 12:03 PM 12:04 PM 12:05 PM
12:00PM 12:05 PM

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What is different Telemetry and today’s SNMP/Syslog
SNMP/Syslog Telemetry
Event Notification Push Push
State Monitoring Polling base Push
Data Format Variable(MIB/Text) Defined data model
Visualization Event shows with
Topology map
Compare streaming
data

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Network Weather map
https://www.network-weathermap.com/
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https://www.janog.gr.jp/meeting/janog32/weathermap.html#weathermap-other

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Telemetry data
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interface counter state push to collector periodically

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Telemetry data
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• https://youtu.be/bMX8OdD9wiM

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So.
• Telemetry data is comparable between interfaces/devices with Times scale
• But NMS based network weather map is instinctive
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We combined Telemetry and Topology map
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We combined Telemetry and Topology map
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• https://youtu.be/QCd47VAcczc

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We combined Telemetry and Topology map
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Conclusion
• Telemetry data is comparable between interfaces/devices with Times scale
• But it is a little bit less instinctive
• If Telemetry + Network Topology …. More Powerful!!
• This is our turnkey solution product effort, but the philosophy would be also
useful for OSS/DIY system.
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www.arista.com
Thank You
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