Contents

Introduction· 1

Prerequisites· 1

Restrictions and guidelines· 1

Example: Configuring sFlow· 1

Network configuration· 1

Analysis· 2

Applicable hardware and software versions· 2

Procedures· 3

Configuring Device A· 3

Configuring Device B· 4

Verifying the configuration· 5

Configuration files· 5

 

Introduction

This document provides sFlow configuration examples.

Prerequisites

The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of sFlow.

Restrictions and guidelines

When you configure sFlow, follow these restrictions and guidelines:

·     You can specify only the random sampling mode (the default).

·     For the remote sFlow collector to receive sFlow packets, the IP address of the sFlow collector specified on the sFlow agent must be the same with that of the remote sFlow collector.

·     If the number of packets sampled by an interface is too much in a heavy traffic network, increase the flow sampling interval. If an interface samples insufficient packets in a light traffic network, decrease the flow sampling interval.

·     If an interface collects data too frequently in a heavy traffic network, increase the counter sampling interval. If the sampling statistics is not accurate in a light traffic network, decrease the counter sampling interval.

Example: Configuring sFlow

Network configuration

As shown in Figure 1, perform the following tasks:

·     Configure flow sampling to sample packets on Device A and Device B.

·     Configure counter sampling to periodically collect the counter information on Device A and Device B.

Figure 1 Network diagram

 

 

Analysis

To obtain interface counter information and packet information, you must configure both flow sampling and counter sampling.

Applicable hardware and software versions

The following matrix shows the hardware and software versions to which this configuration example is applicable:

 

Hardware	Software version
S6520XE-HI switch series	Supported in Release 11xx
S5560X-EI switch series	Supported in Release 111x
S5500V2-EI switch series	Supported in Release 111x
MS4520V2-30F switch	Supported in Release 111x
S5560S-EI switch series S5560S-SI switch series	Supported in Release 612x
S5130S-HI switch series S5130S-EI switch series S5130S-SI switch series S5130S-LI switch series	Supported in Release 612x
S5120V2-SI switch series S5120V2-LI switch series	Supported in Release 612x
S3100V3-EI switch series S3100V3-SI switch series	Supported in Release 612x
S5110V2 switch series	Supported in Release 612x
S5110V2-SI switch series	Supported in Release 612x
S5000V3-EI switch series	Supported in Release 612x
S5000E-X switch series	Supported in Release 612x
WAS6000 switch series	Supported in Release 612x
E128C switch E152C switch E500C switch series E500D switch series	Supported in Release 612x
MS4520V2 switch series (except the MS4520V2-30F switch)	Supported in Release 612x
MS4320V2 switch series MS4300V2 switch series MS4320 switch series MS4200 switch series	Supported in Release 612x
WS5850-WiNet switch series	Supported in Release 612x
WS5820-WiNet switch series WS5810-WiNet switch series	Supported in Release 612x

 

Procedures

Configuring Device A

# Create VLAN 10. Assign GigabitEthernet 1/0/1 through GigabitEthernet 1/0/3 to VLAN 10.

<DeviceA> system-view

[DeviceA] vlan 10

[DeviceA-vlan10] port GigabitEthernet 1/0/1 to GigabitEthernet 1/0/3

[DeviceA-vlan10] quit

# Assign an IP address to VLAN-interface 10.

[DeviceA] interface vlan-interface 10

[DeviceA-Vlan-interface10] ip address 10.1.1.1 255.255.255.0

[DeviceA-Vlan-interface10] quit

# Assign IP addresses to other interfaces. (Details not shown.)

# Assign an IP address to the sFlow agent.

[DeviceA] sflow agent ip 10.1.1.1

# Specify the sFlow collector ID as 1, IP address as 30.1.1.2, and port number as 5000.

[DeviceA] sflow collector 1 ip 30.1.1.2 port 5000

# Enable counter sampling and set the counter sampling interval to 120 seconds on GigabitEthernet 1/0/1.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] sflow counter interval 120

# Specify sFlow collector 1 for counter sampling on GigabitEthernet 1/0/1.

[DeviceA-GigabitEthernet1/0/1] sflow counter collector 1

[DeviceA-GigabitEthernet1/0/1] quit

# Enable counter sampling and set the counter sampling interval to 120 seconds on GigabitEthernet 1/0/2.

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] sflow counter interval 120

# Specify sFlow collector 1 for counter sampling on GigabitEthernet 1/0/2.

[DeviceA-GigabitEthernet1/0/2] sflow counter collector 1

[DeviceA-GigabitEthernet1/0/2] quit

# Enable flow sampling and set the sampling interval to 100000 on GigabitEthernet 1/0/1.

[DeviceA] interface gigabitethernet 1/0/1

[DeviceA-GigabitEthernet1/0/1] sflow sampling-rate 100000

# Specify sFlow collector 1 for flow sampling on GigabitEthernet 1/0/1.

[DeviceA-GigabitEthernet1/0/1] sflow flow collector 1

[DeviceA-GigabitEthernet1/0/1] quit

# Enable flow sampling and set the sampling interval to 100000 on GigabitEthernet 1/0/2.

[DeviceA] interface gigabitethernet 1/0/2

[DeviceA-GigabitEthernet1/0/2] sflow sampling-rate 100000

# Specify sFlow collector 1 for flow sampling on GigabitEthernet 1/0/2.

[DeviceA-GigabitEthernet1/0/2] sflow flow collector 1

[DeviceA-GigabitEthernet1/0/2] quit

Configuring Device B

# Create VLAN 20. Assign GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 to VLAN 20.

<DeviceB> system-view

[DeviceB] vlan 20

[DeviceB-vlan20] port GigabitEthernet 1/0/1 to GigabitEthernet 1/0/2

[DeviceB-vlan20] quit

# Assign an IP address to VLAN-interface 20.

[DeviceB] interface vlan-interface 20

[DeviceB-Vlan-interface20] ip address 20.1.1.1 255.255.255.0

[DeviceB-Vlan-interface20] quit

# Assign an IP address to the sFlow agent.

[DeviceB] sflow agent ip 20.1.1.1

# Specify the sFlow collector ID as 1, IP address as 30.1.1.2, and port number as 5000.

[DeviceB] sflow collector 1 ip 30.1.1.2 port 5000

# Enable counter sampling and set the counter sampling interval to 30 seconds on GigabitEthernet 1/0/1.

[DeviceB] interface gigabitethernet 1/0/1

[DeviceB-GigabitEthernet1/0/1] sflow counter interval 30

# Specify sFlow collector 1 for counter sampling on GigabitEthernet 1/0/1.

[DeviceB-GigabitEthernet1/0/1] sflow counter collector 1

# Enable flow sampling and set the sampling interval to 20000 on GigabitEthernet 1/0/1.

[DeviceB-GigabitEthernet1/0/1] sflow sampling-rate 20000

# Specify sFlow collector 1 for flow sampling on GigabitEthernet 1/0/1.

[DeviceB-GigabitEthernet1/0/1] sflow flow collector 1

[DeviceB-GigabitEthernet1/0/1] quit

Verifying the configuration

# Verify the following items on Device A:

·     GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 enabled with sFlow are active.

·     The counter sampling interval is 120 seconds.

·     The flow sampling interval is 100000.

[DeviceA] display sflow

sFlow datagram version: 5

Global information:

Agent IP: 10.1.1.1(CLI)

Source address:

Collector information:

ID    IP              Port  Aging      Size VPN-instance Description

1     30.1.1.2         5000  N/A        1400              CLI Collector

Port information:

Interface      CID   Interval(s) FID   MaxHLen Rate       Mode          Status

GE1/0/1         1    120         1     128     100000     random        Active

GE1/0/2         1    120         1     128     100000     random        Active

Configuration files

·     Device A:

#

vlan 10

#

interface Vlan-interface10

 ip address 10.1.1.1 255.255.255.0

#

 sflow agent ip 10.1.1.1

 sflow collector 1 ip 30.1.1.2 port 5000 description "CLI Collector"

#

interface GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 10

 sflow flow collector 1

 sflow sampling-rate 100000

 sflow counter collector 1

 sflow counter interval 120

#

interface GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 10

 sflow flow collector 1

 sflow sampling-rate 100000

 sflow counter collector 1

 sflow counter interval 120

#

interface GigabitEthernet1/0/3

 port link-mode bridge

 port access vlan 10

#

·     Device B:

#

vlan 20

#

interface Vlan-interface20

 ip address 20.1.1.1 255.255.255.0

#

 sflow agent ip 20.1.1.1

 sflow collector 1 ip 30.1.1.2 port 5000 description "CLI Collector"

#

interface GigabitEthernet1/0/1

 port link-mode bridge

 port access vlan 20

 sflow flow collector 1

 sflow sampling-rate 20000

 sflow counter collector 1

 sflow counter interval 30

#

interface GigabitEthernet1/0/2

 port link-mode bridge

 port access vlan 20

#