Mellanox MLNX-OS® User Manualfor SX1018HP Ethernet Managed Blade Switch

Rev 1.6.9

Mellanox Technologies

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 To verify the attributes of running mirroring sessions:

5.11 sFlow

sFlow (ver. 5) is a procedure for statistical monitoring of traffic in networks. MLNX-OS supports

an sFlow sampling mechanism (agent), which includes collecting traffic samples and data from

counters. The sFlow datagrams are then sent to a central collector.

The sampling mechanism must ensure that any packet

going into the system has an equal chance

of being sampled, irrespective of the flow to which it belongs. The sampling mechanism provides

the collector with periodical information on the amount (and load) of traffic per interface by

loading the counter samples into sFlow datagrams.

The sFlow packets are encapsulated and sent in UDP over

IP. The UDP port number that is used

is the standard 6343 by default.

Figure 14: sFlow Functionality Overview

5.11.1 Flow Samples

The sFlow agent samples the data path packet based.

Truncation and sampling rate are the two parameters tha

t influence the flow samples. In case of

congestion the flow samples can be truncated to a predefined size before it is being assigned to

the CPU. The truncation can be set to any value between 64 to 256 bytes with the default being

128 bytes. Furthermore, the sampling rate may also be adjust as required.

Source interfaces

Interface direction

-------------------------

eth1/1 both

switch (config) # show monitor session summary

Session Admin Status Mode Destination Source

1 Enable Up add-eth eth1/2 eth1/1(b)

2 Disable Down add-vlan eth1/2 eth1/8(i), po1(e)

3 Enable Up add-eth eth1/5 eth1/18(e)

7 Disable Down local