Buffer Histograms Monitoring

As it is becoming increasingly complex to manage networks, and network administrators need more tools to understand network behavior, it is necessary to provide basic information about network performance, identify network bottlenecks, and provide information for the purposes of network optimization and future planning.

Therefore, network administrators are required to constantly review network port behavior, record port buffer consumption, and identify shortage in buffer resources and record flows which lead to the excessive buffer consumption. NVIDIA Onyx provides the following mechanisms to perform these tasks:

Sampling (histograms)—a network administrator can enable a sampling of the port buffer occupancy, record occupancy changes over time, and provide information for different levels of buffer occupancy, and amount of time the buffer has been occupied during the observation period.
Thresholds—thresholds may be enabled per port to record the network time when port buffer occupancy crosses the defined threshold and when buffer occupancy drops below it.
Flow recording—a record of the most active flows which cause an excessive usage of the port buffers may be kept. Once enabled, the system may identify flow patterns and present a user with a list of flows, based on which a network administrator can rearrange distribution of the data flows in the network and minimize data loss.

Additional Reading and Use Cases

For more information about this feature and its potential applications, please refer to the following community post:

Understanding Telemetry Sampling on Spectrum Switches

Buffer Histograms and Thresholds Commands

protocol telemetry

	protocol telemetry no protocol telemetry Unhides telemetry config CLIs. The no form of the command hides telemetry config CLIs.
Syntax Description	N/A
Default	Hidden
Configuration Mode	config
History	3.6.3004
Example	switch (config) # protocol telemetry
Related Commands
Notes

telemetry shutdown

	telemetry shutdown no telemetry shutdown Disables the telemetry protocol, threshold detection, and histogram fetching for all sampling enabled interfaces without changing any internal configuration. The no form of the command enables telemetry protocol.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config
History	3.6.3004
Example	switch (config) # no telemetry shutdown
Related Commands	protocol telemetry
Notes

telemetry sampling log

	telemetry sampling log <time> no telemetry sampling log <time> Enables the log interval value (histogram fetching) from device. The no form of the command disables the log interval value.
Syntax Description	time	Input range: 100-60000 (in msec)
Default	1000 millisecond
Configuration Mode	config
History	3.6.3004
Example	switch (config) # telemetry sampling log 1000
Related Commands	protocol telemetry
Notes

telemetry sampling tc

	telemetry sampling tc <0-7> [mcast \| ucast] no telemetry sampling tc <0-7> [mcast \| ucast] Enables multicast sampling (histogram fetching) on a traffic class for a particular Ethernet interface. The no form of the command disables multicast sampling on a TC for a particular Ethernet interface.
Syntax Description	mcast	Multicast traffic
Syntax Description	ucast	Unicast traffic
Default	N/A
Configuration Mode	config interface ethernet
History	3.6.3004
Example	switch (config 1/2) # telemetry sampling tc 3 mcast
Related Commands
Notes

telemetry threshold

	telemetry threshold tc <0-7> [ucast \| mcast] no telemetry threshold tc <0-7> [ucast \| mcast] Enables threshold in hardware for a particular traffic class. The no form of the command disables threshold in hardware for a particular traffic class.
Syntax Description	ucast	Unicast traffic
Syntax Description	mcast	Multicast traffic
Default	Disabled
Configuration Mode	config interface ethernet config interface port-channel config interface mlag-port-channel
History	3.6.5000
Example	switch (config 1/12) # telemetry threshold tc 0 ucast
Related Commands
Notes

telemetry threshold level

	telemetry threshold level <level> no telemetry threshold level <level> Configures the threshold level in the hardware per port. The no form of the command resets the parameter to its default.
Syntax Description	level	For Spectrum-based systems: Range: 96-1,000,000 Level is set in bytes and in increments of 96	For Spectrum-2 and Spectrum-3-based systems: Range: 144-1,000,000 Level is set in bytes and in increments of 144
Default	69984
Configuration Mode	config interface ethernet config interface port-channel config interface mlag-port-channel
History	3.6.5000
History	3.9.0900	Added minimum level value for Spectrum-2 and Spectrum-3
Example	switch (config 1/12) # telemetry threshold level 288
Related Commands
Notes

telemetry threshold log

	telemetry threshold log no telemetry threshold log Enables logging of threshold events in syslog. The no form of the command disables logging.
Syntax Description	N/A
Default	Disabled
Configuration Mode	config
History	3.6.4006
Example	switch (config) # telemetry threshold log
Related Commands
Notes

telemetry threshold syslog

	telemetry threshold syslog <time> no telemetry threshold syslog <time> The command sets threshold events logging rate on per hour basis. The no form of the command sets the logging rate back to default.
Syntax Description	time	Max rate per hour Range: 1-3600
Default	100
Configuration Mode	config
History	3.6.4006
Example	switch (config) # telemetry threshold syslog 400
Related Commands
Notes

clear telemetry

	clear telemetry {threshold \| sampling} [interface <type> <port-id>] [tc <0-7> [ucast \| mcast]] Clears telemetry data.
Syntax Description	type	Possible values: ethernet, port-channel, mlag-port-channel
	tc	Traffic class
	mcast	Multicast traffic
	ucast	Unicast traffic
Default	N/A
Configuration Mode	config interface ethernet config interface port-channel config interface mlag-port-channel
History	3.6.5000
Example	switch (config interface ethernet 1/12) # clear telemetry threshold level 288
Related Commands
Notes

clear telemetry threshold

	clear telemetry threshold [interface <type> <if>] Clears threshold and top talker data.
Syntax Description	type	Available values:ethernet, port-channel, mlag-port-channel
Default	N/A
Configuration Mode	config
History	3.6.6105
Example	switch (config) # clear telemetry threshold interface ethernet 1/34-1/36
Related Commands
Notes

stats export csv telemetry

	stats export csv telemetry <slot>/<port>[/<subport>]/<tc>-[mcast \| ucast][filename <name>] [after * ] [before *] Exports histograms collected by stats to a csv file.
Syntax Description	slot/port	Port number
Syntax Description	subport	Subport number to be used if a port is split
Default	N/A
Configuration Mode	Any command mode
History	3.6.3004
History	3.9.0500	Updated example
Example	switch (config) # stats export csv telemetry 1/1/4-ucast after 2020/03/16 10:54:58 before 2020/03/16 11:16:24 Generated report file: telemetry-20200316-111704.csv
Related Commands
Notes

file stats telemetry delete

	file stats telemetry delete <filename> Deletes the given .csv file created by “stats export” command to user directory.
Syntax Description	N/A
Default	N/A
Configuration Mode	config
History	3.6.3004
Example	switch (config) # file stats telemetry delete telemetry-20171006-102158.csv
Related Commands
Notes

file stats telemetry delete latest

	file stats telemetry delete latest Delete the latest stats telemetry file.
Syntax Description	N/A
Default	N/A
Configuration Mode	Configure terminal
History	3.8.1000
Example	(config) # file stats telemetry delete latest
Related Commands	file stats telemetry delete <file_name> file stats telemetry delete all
Notes

file stats telemetry delete all

	file stats telemetry delete all Deletes all stats telemetry files from machine.
Syntax Description	N/A
Default	N/A
Configuration Mode	Configure terminal
History	3.8.1000
Example	(config) # file stats telemetry delete all
Related Commands	file stats telemetry delete <file_name> file stats telemetry delete latest
Notes

file stats telemetry upload

	file stats telemetry upload <filename> [vrf <vrf-name>] <upload-url> Uploads .csv file created by “stats export” command to user directory.
Syntax Description	N/A
Default	N/A
Configuration Mode	config
History	3.6.3004
History	3.9.2000—Added VRF option
Example	switch (config) # file stats telemetry upload telemetry-20170119-102715.csv scp://username:password@server//directory Password (if required): ******
Related Commands
Notes

file stats telemetry upload latest

	file stats telemetry upload latest [vrf <vrf-name>] <upload-url> Upload the latest stats telemetry file to a remote host.
Syntax Description	file stats telemetry upload latest [vrf <vrf-name>] <upload-url>
Default	N/A
Configuration Mode	Configure terminal
History	3.8.1000
History	3.9.2000—Added VRF option
Example	(config) # file stats telemetry upload latest scp://user:pass@10.135.155.8/tmp
Related Commands	file stats telemetry upload <file_name> file stats telemetry upload all
Notes

file stats telemetry upload all

	file stats telemetry upload all [vrf <vrf-name>] <upload_url> Upload all stats telemetry files to a remote host.
Syntax Description	vrf-name—VRF to be affected. If "vrf-name" parameter is not specified, "default" VRF will be used.
Default	N/A
Configuration Mode	Configure terminal
History	3.8.1000
History	3.9.2000—Added VRF option
Example	(config) # file stats telemetry upload all scp://user:pass@10.135.155.8/tmp
Related Commands	file stats telemetry upload <file_name> file stats telemetry upload latest
Notes

show telemetry

	show telemetry Displays the global configuration of telemetry properties.
Syntax Description	N/A
Default	N/A
Configuration Mode	config
History	3.6.4000
Example
Telemetry Status : Enabled H/W Sampling Interval(nsec) : 512 S/W Sampling Interval(ms) : 1000 Threshold Logging : Disabled Threshold Logging(rate per hour) : 100 ----------------------------------------------------------------------------------------------------- Interface TC Sampling Threshold Level (bytes) ----------------------------------------------------------------------------------------------------- Eth1/1 N/A Disabled Disabled N/A Eth1/2 N/A Disabled Disabled N/A Eth1/3 N/A Disabled Disabled N/A Eth1/4 N/A Disabled Disabled N/A Eth1/5 N/A Disabled Disabled N/A
Related Commands
Notes

show telemetry sampling tc mcast

	show telemetry sampling <slot>/<port>[/<subport>] tc <tc_id> mcast Displays fetched multicast histogram details for a given tc_id of the Ethernet interface.
Syntax Description	slot/port	Ethernet port number
	subport	Ethernet subport number to be used if a port is split
	tc_id	Range: 0-7
Default	N/A
Configuration Mode	Any command mode
History	3.6.3004
Example
switch (config) # show telemetry sampling 1/2 tc 3 mcast ----------------------------------------------------------------------------------------------------------------------------------------- Telemetry histogram: Eth1/2 traffic-class 3 - mcast Time Bin sizes (nsec buffer was occupied in bytes range) ----------------------------------------------------------------------------------------------------------------------------------------- 01/16/17 2976< 27552 52128 76704 101280 125856 150432 175008 199584 199584> 04:09:07.79936 1000000000 0 0 0 0 0 0 0 0 0 04:09:08.80096 1000000000 0 0 0 0 0 0 0 0 0 04:09:09.80355 1000000000 0 0 0 0 0 0 0 0 0 04:09:10.80518 1000000000 0 0 0 0 0 0 0 0 0 04:09:11.80682 1000000000 0 0 0 0 0 0 0 0 0
Related Commands
Notes

show telemetry sampling tc mcast last

	show telemetry sampling <slot>/<port>[/<subport>] tc <tc_id> mcast last <num_of_entries> Displays last num of fetched multicast histogram details for the given tc_id of the ethernet interface.
Syntax Description	slot/port	Ethernet port number
	subport	Ethernet subport number to be used if a port is split
	tc_id	Range: 0-7
	num_of_entries	Range: 0-1000
Default	N/A
Configuration Mode	Any command mode
History	3.6.3004
Example
switch (config) # show telemetry sampling 1/2 tc 3 mcast last 4 ------------------------------------------------------------------------------------------------------------------------------------------------------ Telemetry histogram: Eth1/2 traffic-class 3 - mcast Time Bin sizes (nsec buffer was occupied in bytes range) ------------------------------------------------------------------------------------------------------------------------------------------------------ 01/16/17 2976< 27552 52128 76704 101280 125856 150432 175008 199584 199584> 04:23:38.28864 1000000000 0 0 0 0 0 0 0 0 0 04:23:39.28977 1000000000 0 0 0 0 0 0 0 0 0 04:23:40.29111 1000000000 0 0 0 0 0 0 0 0 0 04:23:41.29259 1000000000 0 0 0 0 0 0 0 0 0
Related Commands
Notes	If the requested entries are more than what the DB contains, it prints the amount in the table.

show telemetry sampling tc ucast

	show telemetry sampling <slot>/<port>[/<subport>] tc <tc_id> ucast Displays fetched unicast histogram details for a given TC ID of the Ethernet interface.
Syntax Description	slot/port	Ethernet port number
	subport	Ethernet subport number to be used if a port is split
	tc_id	Range: 0-7
Default	N/A
Configuration Mode	Any command mode
History	3.6.3004
Example
switch (config) # show telemetry sampling 1/2 tc 6 ucast ------------------------------------------------------------------------------------------------------------------------------------------------------ Telemetry histogram: Eth1/2 traffic-class 6 - ucast Time Bin sizes (nsec buffer was occupied in bytes range) ------------------------------------------------------------------------------------------------------------------------------------------------------ 01/13/17 2976< 27552 52128 76704 101280 125856 150432 175008 199584 199584> 08:18:09.67745 1000000000 0 0 0 0 0 0 0 0 0 08:18:10.67850 1000000000 0 0 0 0 0 0 0 0 0 08:18:11.67953 1000000000 0 0 0 0 0 0 0 0 0
Related Commands
Notes

show telemetry sampling tc ucast last

	show telemetry sampling <slot>/<port>[/<subport>] tc <tc_id> ucast last <num_of_entries> Displays last number of fetched unicast histogram details for the given traffic class ID of the Ethernet interface.
Syntax Description	slot/port	Ethernet port number
	subport	Ethernet subport number to be used if a port is split
	tc_id	Range: 0-7
	num_of_entries	Range: 0-1000
Default	N/A
Configuration Mode	Any command mode
History	3.6.3004
Example
Related Commands
Notes	If the requested entries are more than what the DB contains, it prints the amount in the table.

show telemetry threshold

	show telemetry threshold [interface <type> <port-id>] [tc <0-7> [ucast \| mcast]] Displays threshold data for either all interfaces or single interface or per interface per traffic class.
Syntax Description	type	ethernet port-channel mlag-port-channel
	tc	Traffic class
	mcast	Multicast traffic
	ucast	Unicast traffic
Default	N/A
Configuration Mode	Any command mode
History	3.6.5000
History	3.6.6105	Updated example
Example
switch (config) # show telemetry threshold 1/10-1/13 ------------------------------------------------------------------------------------------------ Event-id Date Time Port TC Level Duration(100 usec) Repeated ------------------------------------------------------------------------------------------------ 1 09/21/17 10:11:48 Eth 1/10 0 100 102497.61 1 2 09/21/17 10:12:06 Eth 1/10 3 100 85714.76 1 switch (config) # show telemetry threshold interface port-channel 20 tc 2 mcast ------------------------------------------------------------------------------------------------------ Event-id Date Time Port TC Level Duration(100 usec) Repeated ------------------------------------------------------------------------------------------------------ 1 09/21/17 10:11:48 Po20 (Eth 1/1) 2 (mcast) 100 102497.61 1 2 09/21/17 10:12:06 Po20 (Eth 1/1) 2 (mcast) 100 85714.76 1
Related Commands
Notes	The command supports displaying up to 1000 threshold events. As a result, if more than 1000 thresholds configured in total, some interfaces may not be displayed. Therefore, to query thresholds for a specific interface, please use the command “show telemetry threshold interface <type> <id>”.

show files stats telemetry

	show files stats telemetry [filename] Displays all files created by the command “stats export csv telemetry”.
Syntax Description	filename	Displays stats for the specified file
Default	N/A
Configuration Mode	Any command mode
History	3.6.3004
History	3.6.8008	Updated example
Example	switch (config) # show files stats telemetry telemetry-20180527-102715.csv Hostname :test-switch Report :telemetry histogram Time lower bound(UTC) :2018/05/28 05:58:10 Time upper bound(UTC) :2018/05/28 05:58:25 Export time(UTC) :2018/05/28 06:00:06 Time lower bound :2018/05/28 08:58:10 +0300 Time upper bound :2018/05/28 08:58:25 +0300 Export time :2018/05/28 09:00:06 +0300 System version :X86_64 sys_test 2018-05-15 04:02:13 x86_64
Related Commands	stats export csv telemetry
Notes

Buffer Histograms Monitoring

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