Sampled Flow Tracking
This chapter describes Arista’s implementation of sampled flow tracking, including configuration instructions and command descriptions. Topics covered by this chapter include:
Sampled Flow Tracking Overview
Network administrators require access to flow information that passes through various network elements to analyze and monitor networks. Sampled flow tracking provides access to IP flow information by sampling traffic flows in ingress direction on the interfaces on which it is configured. The samples are then used to create flow records that are exported to the configured collectors in the Internet Protocol Flow Information Export (IPFIX) format.
Sampled flow tracking terminology:
- Flow tracker: It is a collection of interfaces that collect samples and create flow records. The flow tracker has one or more exporters.
- Exporter: It sends flow records to one or more collectors.
- Collector: It receives flow records from one or more exporters.
- Data record: It contains values of the parameters corresponding to a template record.
- Template record: It defines the structure and interpretation of fields in a data record. It is an ordered sequence of type and length pairs.
- Options template record: It is a type of template record that defines the structure and interpretation of fields in a data record, including how to scope the applicability of the data record.
Data records are created based on the following flow key fields: source IP address, destination IP address, IP protocol, source port, destination port, VRF, and VLAN. These records support IPv4 flow data record and IPv6 flow data record.
Sampled flow tracking supports the following options data records:
- VRF record: mapping of VRF ID to VRF name.
- Interface record: mapping of interface ID to interface name.
- Flow key indicator record: mapping of template ID to flow key indicator.
- Flow tracker record: contains information about configured flow tracker.
Sampled Flow Tracking Limitations
The limitations of Sampled flow tracking are:
- Sampled flow tracking is active only when sFlow is disabled on the device.
- Sampled flow tracking does not support export of IPFIX messages over ECMP paths.
- Sampled flow tracking route simulation is not supported for ECMP paths.
Configuring Sampled Flow Tracking
These sections describe sampled flow tracking configurations.
Configuring Sampled Flow Tracking
Use the flow tracker sampled command to enable sampled flow tracking on a tracker. Each tracker should have a minimum of one exporter configured.
Example
This command enables sampled flow tracking on an interface Eth1 and the flow tracker ftr1.
switch(config)# interface Eth1
switch(config-if-Et1)# flow tracker sampled ftr1Use the sample command to enable the sample rate for a specific sampled flow tracker. The default sample rate is 1048576.
Example
These commands configure a sample rate of 1024 for the sampled flow tracker.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#sample 1024Configuring the Sampled Flow Tracker
Use the tracker command to configure a sampled flow tracker for a device.
Example
This command configures a sampled flow tracker named ftr1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)# tracker ftr1Use the record export on interval command to configure the interval at which active flow records are exported. The default interval is 300000 milliseconds.
Example
These commands configure an active record interval of 7000 for the exporter exp1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#tracker ftr1
switch(config-ftr-sampled-tr-ftr1)#exporter exp1
switch(config-ftr-sampled-tr-ftr1-exp-exp1)#record export on interval 7000Use the record export on inactive timeout command to configure the interval at which timed-out inactive flow records are exported. The default interval is 15000 milliseconds.
These commands configure an inactive record interval of 4000 for the exporter exp1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#tracker ftr1
switch(config-ftr-sampled-tr-ftr1)#exporter exp1
switch(config-ftr-sampled-tr-ftr1-exp-exp1)#record export on inactive timeout
4000Configuring Exporter for Sampled Flow Tracker
Use the exporter command to configure or unconfigure an exporter for a specific tracker.
Example
This command configures exporter exp1 for the specific tracker ftr1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)# tracker ftr1
switch(config-ftr-sampled-tr-ftr1)# exporter exp1Use the collector command to configure the collector for the specific exporter.
Example
These commands configure a collector for the IPv4 address 192.0.2.0 and collector port number 10.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#tracker ftr1
switch(config-ftr-sampled-tr-ftr1)#exporter exp1
switch(config-ftr-sampled-tr-ftr1-exp-exp1)#collector 192.0.2.0 port 10Use the local interface command to configure the local source interface for the specific exporter.
Example
These commands configure the local source interface ethernet1 for the exporter exp1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#tracker ftr1
switch(config-ftr-sampled-tr-ftr1)#exporter exp1
switch(config-ftr-sampled-tr-ftr1-exp-exp1)#local interface ethernet1Use the dscp command to configure the DSCP value for the specific exporter. The default DSCP value is 0.
Example
These commands configure a DSCP value of 10 for the exporter exp1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#tracker ftr1
switch(config-ftr-sampled-tr-ftr1)#exporter exp1
switch(config-ftr-sampled-tr-ftr1-exp-exp1)#dscp 10Use the format ipfix version command to configure the IPFIX version and maximum packet size for the specific exporter. The default IPFIX version is 10 and the default maximum packet size is 9152.
Example
These commands configure an IPFIX version of 10 and a maximum packet size of 854 for the exporter exp1.
switch(config)#flow tracking sampled
switch(config-flow-tracking-sampled)#tracker ftr1
switch(config-ftr-sampled-tr-ftr1)#exporter exp1
switch(config-ftr-sampled-tr-ftr1-exp-exp1)#format ipfix version 10
max-packet-size 854Use the template interval command to configure the interval at which templates are exported for the specific exporter. The default template interval is 3600000 milliseconds.
Example
This command configures the interval of 3400000 milliseconds for the exporter exp1.
switch(config-ftr-sampled-tr-exp-ftr1-exp1)# template interval 3400000Sampled Flow Tracking configuration Examples
This section describes the command configurations required to configure sampled flow tracking.
Sampled Flow Tracking Basic configuration
The following commands enable a basic configuration.
Sampled Flow Tracking commands
This section contains descriptions of Sampled flow tracking commands.
configuration commands
Interface configuration Command
Privileged EXEC Command
Sampled Flow Tracking Display commands
clear flow tracking sampled counters
The clear flow tracking sampled counters command clears the flow tracking counters for all trackers, a specified tracker, or a specified tracker and exporter.
Command Mode
Privileged EXEC
Command Syntax
clear flow tracking sampled counters [ tracker tracker_name [ exporter exporter_name ]]
Parameters
- tracker tracker_name Specifies the flow tracker.
- exporter exporter_name Specifies the exporter.
Example
- This command clears the flow counters for the tracker ftr1
and exporter
exp1.
switch#clear flow tracking sampled counters tracker ftr1 exporter exp1 switch#
collector
The collector command configures a collector to receive flow records from a specified exporter.
The no collector and default collector commands remove the configured collector from running-config.
Command Mode
Sampled Flow Tracking Exporter configuration
Command Syntax
collector { ipv4_address | ipv6_address } [ port port_number ]
no collector { ipv4_address | ipv6_address } [ port port_number ]
default collector { ipv4_address | ipv6_address } [ port port_number ]
Parameters
- ipv4_address Specifies the IPv4 address of the collector.
- ipv6_address Specifies the IPv6 address of the collector.
- port port_number Specifies the port number for the collector. Values range from 1 to 65535. The default value is 4739.
Example
- These commands configure a collector for the IPv4 address
192.0.2.0 and collector port number
10.
switch(config)#flow tracking sampled switch(config-flow-tracking-sampled)#tracker ftr1 switch(config-ftr-sampled-tr-ftr1)#exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)#collector 192.0.2.0 port 10 switch(config-ftr-sampled-tr-ftr1-exp-exp1)#exit switch(config-ftr-sampled-tr-ftr1)#exit switch(config-flow-tracking-sampled)#exit switch(config)#
dscp
The dscp command configures the Differentiated Services Code Point (DSCP) value for a specific exporter.
The no dscp and default dscp commands reset the DSCP value to the default of 0.
Command Mode
Sampled Flow Tracking Exporter configuration
Command Syntax
dscp dscp_value
no dscp dscp_value
default dscp dscp_value
Parameters
- dscp_value the DSCP value assigned to the exporter. Value ranges from 0 to 63. Default value is 0.
Example
- These commands configure a DSCP value of 10 for the exporter
�exp1.�
switch(config)#flow tracking sampled switch(config-flow-tracking-sampled)#tracker ftr1 switch(config-ftr-sampled-tr-ftr1)#exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)#dscp 10 switch(config-ftr-sampled-tr-ftr1-exp-exp1)#exit switch(config-ftr-sampled-tr-ftr1)#exit switch(config-flow-tracking-sampled)#exit switch(config)#
exporter
The exporter command places the switch in sampled flow tracking exporter configuration mode for the specified exporter and creates the exporter if it does not yet exist.
The no exporter and default exporter commands remove the specific exporter from running-config.
Command Mode
Sampled Flow Tracking Tracker configuration
Command Syntax
exporter exporter_name
no exporter exporter_name
default exporter exporter_name
Parameters
- exporter_name the name of the exporter.
Example
- These commands create exporter exp1 for the flow tracker ftr1 and
place the switch in configuration mode for that
exporter.
switch(config)#flow tracking sampled switch(config-flow-tracking-sampled)#tracker ftr1 switch(config-ftr-sampled-tr-ftr1)#exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)#
flow tracker sampled
The flow tracker sampled command configures an interface to be part of a flow tracker. An interface can belong to only one flow tracker.
The no flow tracker sampled and default flow tracker sampled commands remove the specified interface from the specified tracker.
Command Mode
Interface-ethernet configuration
Command Syntax
flow tracker sampled tracker_name
no flow tracker sampled tracker_name
default flow tracker sampled tracker_name
Parameters
- tracker_name the name of the flow tracker to which the interface is to be added.
Example
- This command configures ethernet interface 1 to participate in
the flow tracker
�ftr1.�
switch(config)# interface ethernet 1 switch(config-if-Et1)# flow tracker sampled ftr1 switch(config-if-Et1)#
flow tracking sampled
The flow tracking sampled command places the switch in sampled flow tracking configuration mode. Sampled flow tracking configuration mode is a group-change mode; changes made in a group-change mode are saved by exiting the mode.
The no flow tracking sampled and default flow tracking sampled commands remove all sampled flow tracking configuration from running-config.
Command Mode
Global configuration
Command Syntax
flow tracking sampled
no flow tracking sampled
default flow tracking sampled
commands Available in Sampled Flow Tracking configuration Mode
- abortexits mode without saving changes
- exitexits mode and saved changes
- sample configures sample parameters
- shutdown (sampled flow tracking) enables or disables sampled flow tracking
- tracker configures a flow tracker
Example
- This command places the switch in sampled flow tracking
configuration
mode.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)#
format ipfix version
The format ipfix version command configures the IPFIX version and maximum packet size for a specific exporter.
The no format ipfix version and default format ipfix version commands remove the previously configured IPFIX version and the maximum packet size value from running-config.
Command Mode
Sampled Flow Tracking configuration
Command Syntax
format ipfix version ipfix_version [ max-packet-size max-packet-size value ]
no format ipfix version ipfix_version [ max-packet-size ]
default format ipfix version ipfix_version [ max-packet-size ]
Parameters
- ipfix_version the IPFIX version. Default value is 10.
- max-packet-size max-packet-size value the IPFIX maximum packet size. Value ranges from 512 to 65472. Default value is 9152.
Example
- These commands configure an IPFIX version of 10 and a maximum
packet size of 854 for the exporter
exp1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-ftr-sampled-tr-ftr1)# exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)# format ipfix version 10 max-packet-size 854
local interface
The local interface command configures the local source interface for the specific exporter.
The no local interface and default local interface commands remove the local interface for the specific exporter from running-config.
Command Mode
Sampled Flow Tracking configuration
Command Syntax
local interface interface
no local interface
default local interface
Parameters
-
interface Interface type and numbers. Options include:
- ethernet eth_num displays the information of the specified ethernet interface. The value ranges from 1 to 64.
- Loopback lb_num displays the information of the specified loop back interface. The value ranges from 0 to 2100.
- Management m_num displays the information of the specified Management interface. The management port number ranges from 1 to 2.
- Port-Channel pc_num displays the interface or sub-interface information of the specified port channel. The interface and sub-interface values of port channel ranges from <1-1000>and <1-2000>.<1-4094> respectively.
- Tunnel t_num displays the information of the specified tunnel. The value ranges from 0 to 255.
- Vlan vlan_num displays the information of the specified VLAN interface. The value ranges from 1 to 4094.
Example
- These commands configure the local source interface ethernet1 for
the exporter
exp1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-ftr-sampled-tr-ftr1)# exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)# local interface ethernet1
record export on inactive timeout
The record export on inactive timeout command configures the interval at which inactive flow records time out and are exported for a flow tracker.
The no record export on inactive timeout and default record export on inactive timeout commands remove the timeout interval from running-config.
Command Mode
Sampled Flow Tracking configuration
Command Syntax
record export on inactive timeout timeout_value
no record export on inactive timeout
default record export on inactive timeout
Parameters
- timeout_value the flow record inactive export timeout value in milliseconds. Value ranges from 3000 to 900000. The default value is 15000 milliseconds.
Example
- These commands configure an inactive record interval of 6000 for
the exporter
exp1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-ftr-sampled-tr-ftr1)# exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)# record export on inactive timeout 6000
record export on interval
The record export on interval command configures the interval at which active flow records are exported for a flow tracker.
The no record export on interval and default record export on interval commands remove the interval from running-config.
Command Mode
Sampled Flow Tracking configuration
Command Syntax
record export on interval interval_value
no record export on interval
default record export on interval
Parameters
- interval_value the flow record export interval in milliseconds. Value ranges from 5000 to 36000000. The default value is 300000 milliseconds.
Example
- These commands configure an active record interval of 9000 for
the exporter
exp1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-ftr-sampled-tr-ftr1)# exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)# record export on interval 9000
sample
The sample command enables the sample rate for a specific sampled flow tracker.
The no sample and default sample commands remove the sample rate configured for a specific sampled flow tracker from running-config.
Command Mode
Sampled Flow configuration
Command Syntax
sample sample_rate
no sample
default sample
Parameters
- sample_rate the sample flow tracking rate to be assigned for a sampled flow tracker. Value ranges from 1024 to 16777216. Default value is 1048576.
Example
- These commands configure a sample rate of 2056 for the sampled
flow
tracker.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# sample 2056
show flow tracking sampled counters
The show flow tracking sampled counters command displays information about the flow tracking counters of a specific tracker and the counters of a specified exporter within that tracker.
Command Mode
EXEC
Command Syntax
show flow tracking sampled counters[ tracker tracker_name[ exporter exporter_name ]]
Parameters
- tracker tracker_name the specific flow tracker.
- exporter exporter_name the specific exporter within the tracker.
Examples
- This command displays the flow tracking counter information of
the tracker ftr1 and the exporter exp1.
switch# show flow tracking sampled�counters tracker ftr1 exporter exp1 Tracker: ftr1 1 flows, 22 RX packets Flows created: 1, expired: 0 Group: IPv4 1 flows, 22 RX packets Group: IPv6 0 flows, 0 RX packets Exporter: exp1 (IPFIX) Collector: 172.31.24.133 port 4739 52 messages, last sent 0:00:27 ago 0 flow records 2350 options data records, last sent 0:00:27 ago 6 templates, last sent 0:12:27 ago Collector: 172.31.22.131 port 4739 52 messages, last sent 0:00:27 ago 0 flow records 2350 options data records, last sent 0:00:27 ago 6 templates, last sent 0:12:27 ago
show flow tracking sampled flow-table
The show flow tracking sampled flow-table command displays information about the active flows maintained in the eos.
Command Mode
EXEC
Command Syntax
show flow tracking sampled flow-table [ detail | dst-ip | dst-port | group | interface | protocol | src-ip | src-port | tracker | vlan | vrf ]
Parameters
- detail displays detailed flow records.
- dst-ip displays flow records based on destination IPv4 or IPv6 address.
- dst-port displays flow records based on a specified destination port.
- group displays flow records based on IPv4 or IPv6 flow groups.
- interface displays flow records based on ingress interface.
- protocol displays flow records based on the flow IP protocol.
- src-ip displays flow records based on source IPv4 or IPv6 address.
- src-port displays flow records based on a specified source port.
- tracker displays flow records based on flow tracker.
- vlan displays flow records based on a specified flow VLAN ID.
- vrf displays flow records based on flow VRF.
Examples
- This command displays information about the active flows on the
device.
switch# show flow tracking sampled flow-table Tracker: ftr1, Flows: 1 Group: IPv4, Flows: 1 VRF VLAN Source Destination Protocol Start Time Pkts Bytes ---- ------ ------------- ------------- ---------- ---------------------------- ------ ------ red 42 10.10.1.1:0 10.20.1.2:0 UDP 2019-04-18 15:06:50 7 700 - This command displays detailed information about the active
flows on the device.
switch# show flow tracking sampled flow-table detail Tracker: ftr1, Flows: 1 Group: IPv4, Flows: 1 Flow: UDP 10.10.1.1:0 - 10.20.1.2:0, VRF: red, VLAN: 42 Start time: 2019-04-18 15:06:50.268734, Last packet time: 2019-04-18 15:07:03.607900 Packets: 15, Bytes: 1500, TOS: 0, TCP flags: none Source MAC: 001c.73ee.bfe4, Destination MAC: 001c.7374.3b85 Ingress Interface: 'ethernet1', Egress VLAN: routed, Egress Interface: CPU Next hop: unknown, BGP next hop: unknown (AS unknown), Source AS: unknown Source prefix length: 24, Destination prefix length: 32
show flow tracking sampled ipfix options-table
The show flow tracking sampled ipfix options-table command displays information about the sampled IPFIX options table available.
Command Mode
EXEC
Command Syntax
show flow tracking sampled ipfix options-table tracker [ flow-key | flow-tracker | interface | vrf ]
Parameters
- tracker displays the output for a specific flow tracker.
- flow-key displays the flow keys options table.
- flow-tracker displays the flow tracker options table.
- interface displays the interface options table.
- vrf displays the VRF options table.
Examples
- This command displays the sampled IPFIX options table for the
tracker
ftr1.
switch# show flow tracking sampled�ipfix options-table Tracker: ftr1 Observation domain: ftr1, ID: 1 Active interval: 30sec Inactive timeout: 120sec Selector algorithm: random(3) Sampling: 1/1024 Flow tracking type: sampled(1) VRF Table, Template ID: 256, Scope: ingressVRFID VRF ID VRF Name -------------- -------- 0 default 1 red 16777215 Interface Table, Template ID: 257, Scope: ingressInterface Interface ID Interface Name ------------------ ---------------- 0 unknown 3013 ethernet1 3014 ethernet2 1073741823 CPU 1073741824 discard 1074029945 ethernet3/36/1.1 1074292089 ethernet3/36/1.2 2147483648 multicast Flow Keys Table, Template ID: 258, Scope: templateId Template ID Flow Key Indicator ----------------- ------------------ 261 0x7f 262 0x7f
show flow tracking sampled ipfix template
The show flow tracking sampled ipfix template command displays information about the exported IPFIX data templates and options templates.
Command Mode
EXEC
Command Syntax
show flow tracking sampled ipfix template [ data | options | tracker ]
Parameters
- data displays the data templates.
- options displays the flow options template.
- tracker displays the flow tracker template.
Example
- This command displays the sampled IPFIX options table for the
tracker
ftr1.
switch# show flow tracking sampled�ipfix template Tracker: ftr1 Data Template, Group: IPv4, Fields: 26, Template ID: 261 ingressVRFID (234), 4 bytes vlanId (58), 2 bytes sourceIPv4Address (8), 4 bytes destinationIPv4Address (12), 4 bytes protocolIdentifier (4), 1 bytes sourceTransportPort (7), 2 bytes destinationTransportPort (11), 2 bytes sourceMacAddress (56), 6 bytes postDestinationMacAddress (57), 6 bytes octetDeltaCount (1), 8 bytes packetDeltaCount (2), 8 bytes flowStartMilliseconds (152), 8 bytes flowEndMilliseconds (153), 8 bytes flowEndReason (136), 1 bytes tcpControlBits (6), 2 bytes ingressInterfaceType (368), 4 bytes ingressInterface (10), 4 bytes postVlanId (59), 2 bytes egressInterface (14), 4 bytes ipClassOfService (5), 1 bytes bgpSourceAsNumber (16), 4 bytes bgpDestinationAsNumber (17), 4 bytes bgpNextHopIPv4Address (18), 4 bytes ipNextHopIPv4Address (15), 4 bytes sourceIPv4PrefixLength (9), 1 bytes destinationIPv4PrefixLength (13), 1 bytes <-------OUTPUT OMITTED FROM EXAMPLE-------->
show flow tracking sampled
The show flow tracking sampled tracker command displays information about the status of a specific tracker and the status of a specified exporter within that tracker. If no tracker is specified in the command, then all information about all trackers is displayed.
Command Mode
EXEC
Command Syntax
show flow tracking sampled[ tracker tracker_name[ exporter exporter_name ]]
Parameters
- tracker tracker_name the specific flow tracker.
- exporter exporter_name the specific exporter within the tracker.
Examples
- This command displays the status information of the tracker ftr1
and the exporter exp1.
switch# show flow tracking sampled tracker ftr1 exporter exp1 Flow tracking status Type: Sampled Running: yes Sample rate: 1024 Tracker: ftr1 Active interval: 30000ms Inactive timeout: 120000ms Groups: IPv4, IPv6 Exporter: exp1 VRF: default Local interface: Management1 (172.30.150.179) Export format: IPFIX version 10, MTU 1500 DSCP: 48 Template interval: 3600000ms Collectors: 172.31.22.131 port 4739 Active interfaces: Et1
shutdown (sampled flow tracking)
The shutdown command disables sampled flow tracking for the specific exporter.
The no shutdown command enables sampled flow tracking for the specific exporter.
Command Mode
Sampled Flow Tracking configuration
Command Syntax
shutdown
no shutdown
default shutdown
Example
- These commands enable sampled flow tracking for the specific
exporter exp1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-ftr-sampled-tr-ftr1)# exporter exp1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)# local interface ethernet1 switch(config-ftr-sampled-tr-ftr1-exp-exp1)# no shutdown
template interval
The template interval command configures the interval at which templates are exported for a specific exporter. The default template interval is 3600000 milliseconds.
The no template interval and default template interval commands reset the interval rate to the default.
Command Mode
Sampled Flow Tracking configuration
Command Syntax
template interval interval
no template interval
default template interval
Parameters
- interval the interval rate in milliseconds. The value ranges between 5000 and 3600000 milliseconds. The default rate is 3600000 milliseconds.
Example
- This command configures the interval of 3400000 milliseconds for
the exporter exp1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1 switch(config-ftr-sampled-tr-ftr1)# exporter exp1 switch(config-ftr-sampled-tr-exp-ftr1-exp1)# template interval 3400000
tracker
The tracker command configures a sampled flow tracker for a device.
The no tracker and default tracker commands remove the sampled flow tracker from the running config.
Command Mode
Sampled Flow configuration
Command Syntax
tracker tracker_name
no tracker tracker_name
default tracker tracker_name
Parameters
- tracker_name the flow tracker name.
Example
- These commands configure the sampled flow tracker
ftr1.
switch(config)# flow tracking sampled switch(config-flow-tracking-sampled)# tracker ftr1