Implementation Information; Important Points To Remember - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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Table of Contents

Figure 45-1. sFlow Traffic Monitoring System

Switch/Router

Poll Interface

Implementation Information

The Dell Force10 sFlow is designed so that the hardware sampling rate is per line card port-pipe and is

decided based upon all the ports in that port-pipe. If sFlow is not enabled on any port specifically , then the

global sampling rate is downloaded to that port and is to calculate the port-pipe's lowest sampling rate.

This design supports the possibility that sFlow might be configured on that port in the future. Back-off is

triggered based on the port-pipe's hardware sampling rate.

For example, if port 1 in a the port-pipe has sFlow configured with a 16384 sampling rate while port 2 in

the port-pipe has sFlow configured but no sampling rate set, FT OS applies a global sampling rate of 512 to

port 2. The hardware sampling rate on the port-pipe is then set at 512 because that is the lowest configured

rate on the port-pipe. When a high traffic situation occurs, a back-off is triggered and the hardware

sampling rate is backed-off from 512 to 1024. Note that port 1 maintains its sampling rate of 16384; port 1

is unaffected because it maintains its configured sampling rate of 16484.

To avoid the back-off, either increase the global sampling rate or configure all the line card ports with the

desired sampling rate even if some ports have no sFlow configured.

The FTOS implementation of the sFlow MIB supports sFlow configuration via

Collection through management interface is supported on E-Series only

Dell Force10 recommends that the sFlow Collector be connected to the Dell Force10 chassis through a

line card port rather than the RPM Management Ethernet port.

E-Series TeraScale sFlow sampling is done on a per-port-pipe basis.

E-Series ExaScale, C-Series, and S-Series sFlow sampling is done on a per-port basis.

sFlow Collector

sFlow Datagrams

Flow Samples