HP Mellanox SX1018 Mellanox MLNX-OS® User Manualfor SX1018HP Ethernet - Page 87

Statistical Samples, sFlow Datagrams, Sampled Interfaces, Configuring sFlow

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Rev 1.6.9 5.11.2 Statistical Samples The sFlow agent samples interface counters time based. Polling interval is configurable to any value between 5-3600 seconds with the default being 20 seconds. The following statistics are gathered by the CPU: Table 31 - List of Statistical Counters Counter Total packets Number of flow samples Number of statistic samples Number of discarded samples Number of datagrams Description The number of packets that pass through sFlow-enabled ports. The number of packets that are captured by the sampling mechanism. The number of statistical samples. The number of samples that were discarded. The number of datagrams that were sent to the collector. 5.11.3 sFlow Datagrams The sFlow datagrams contain flow samples and statistical samples. The sFlow mechanism uses IP protocol, therefore if the packet length is more than the interface MTU, it becomes fragmented by the IP stack. The MTU may also be set manually to anything in the range of 200-9216 bytes. The default is 1400 bytes. 5.11.4 Sampled Interfaces sFlow must be enabled on physical or LAG interfaces that require sampling. When adding a port to a LAG, sFlow must be disabled on the port. If a port with enabled sFlow is configured to be added to a LAG, the configuration is rejected. Removing a port from a LAG disables sFlow on the port regardless of the LAG's sFlow status. 5.11.5 Configuring sFlow  To configure the sFlow agent: Step 1. Unlock the sFlow commands. Run: switch (config) # protocol sflow Step 2. Enable sFlow on the system. Run: switch (config) # sflow enable Step 3. Enter sFlow configuration mode. Run: switch (config) # sflow switch (config sflow) # Step 4. Set the central collector's IP. Run: switch (config sflow) # collector-ip 10.10.10.10 Step 5. Set the agent-ip used in the sFlow header. Run: switch (config sflow) # agent-ip 20.20.20.20 Mellanox Technologies 87 Mellanox Technologies Confidential

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Rev 1.6.9
Mellanox Technologies
87
Mellanox Technologies Confidential
5.11.2
Statistical Samples
The sFlow agent samples interface counters time based. Polling interval is configurable to any
value between 5-3600 seconds with the default being 20 seconds.
The following statistics are gathered by the CPU:
Table 31 - List of Statistical Counters
Counter
Description
Total packets
The number of packets that pass through sFlow-enabled ports.
Number of flow samples
The number of packets that are captured by the sampling mecha-
nism.
Number of statistic samples
The number of statistical samples.
Number of discarded samples
The number of samples that were discarded.
Number of datagrams
The number of datagrams that were sent to the collector.
5.11.3
sFlow Datagrams
The sFlow datagrams contain flow samples and statistical samples.
The sFlow mechanism uses IP protocol, therefore if the packet length is more than the interface
MTU, it becomes fragmented by the IP stack. The MTU may also be set manually to anything in
the range of 200-9216 bytes. The default is 1400 bytes.
5.11.4
Sampled Interfaces
sFlow must be enabled on physical or LAG interfaces that require sampling. When adding a port
to a LAG, sFlow must be disabled on the port. If a port with enabled sFlow is configured to be
added to a LAG, the configuration is rejected. Removing a port from a LAG disables sFlow on
the port regardless of the LAG’s sFlow status.
5.11.5
Configuring sFlow
To configure the sFlow agent:
Step 1.
Unlock the sFlow commands. Run:
Step 2.
Enable sFlow on the system. Run:
Step 3.
Enter sFlow configuration mode. Run:
Step 4.
Set the central collector’s IP. Run:
Step 5.
Set the agent-ip used in the sFlow header. Run:
switch (config) # protocol sflow
switch (config) # sflow enable
switch (config) # sflow
switch (config sflow) #
switch (config sflow) # collector-ip 10.10.10.10
switch (config sflow) # agent-ip 20.20.20.20