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· 2

Configuring Device A· 2

Configuring Device B· 3

Verifying the configuration· 4

Configuration files· 4

 

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
S6550X-HI switch series	Release 1116 and later
S6880 switch series	Release 1116 and later
S9820-8M switch	Release 1116 and later
S9855 switch series	Release 9126 and later
S9825 switch series	Release 9126 and later

 

Procedures

Configuring Device A

# Create VLAN 10. Assign Twenty-FiveGigE 1/0/1 through Twenty-FiveGigE 1/0/3 to VLAN 10.

<DeviceA> system-view

[DeviceA] vlan 10

[DeviceA-vlan10] port twenty-fivegige 1/0/1 to twenty-fivegige 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 Twenty-FiveGigE 1/0/1.

[DeviceA] interface twenty-fivegige 1/0/1

[DeviceA-Twenty-FiveGigE1/0/1] sflow counter interval 120

# Specify sFlow collector 1 for counter sampling on Twenty-FiveGigE 1/0/1.

[DeviceA-Twenty-FiveGigE1/0/1] sflow counter collector 1

[DeviceA-Twenty-FiveGigE1/0/1] quit

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

[DeviceA] interface twenty-fivegige 1/0/2

[DeviceA-Twenty-FiveGigE1/0/2] sflow counter interval 120

# Specify sFlow collector 1 for counter sampling on Twenty-FiveGigE 1/0/2.

[DeviceA-Twenty-FiveGigE1/0/2] sflow counter collector 1

[DeviceA-Twenty-FiveGigE1/0/2] quit

# Enable flow sampling and set the sampling interval to 10000 on Twenty-FiveGigE 1/0/1.

[DeviceA] interface twenty-fivegige 1/0/1

[DeviceA-Twenty-FiveGigE1/0/1] sflow sampling-rate 10000

# Specify sFlow collector 1 for flow sampling on Twenty-FiveGigE 1/0/1.

[DeviceA-Twenty-FiveGigE1/0/1] sflow flow collector 1

[DeviceA-Twenty-FiveGigE1/0/1] quit

# Enable flow sampling and set the sampling interval to 10000 on Twenty-FiveGigE 1/0/2.

[DeviceA] interface twenty-fivegige 1/0/2

[DeviceA-Twenty-FiveGigE1/0/2] sflow sampling-rate 10000

# Specify sFlow collector 1 for flow sampling on Twenty-FiveGigE 1/0/2.

[DeviceA-Twenty-FiveGigE1/0/2] sflow flow collector 1

[DeviceA-Twenty-FiveGigE1/0/2] quit

Configuring Device B

# Create VLAN 20. Assign Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 to VLAN 20.

<DeviceB> system-view

[DeviceB] vlan 20

[DeviceB-vlan20] port twenty-fivegige 1/0/1 to twenty-fivegige 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 Twenty-FiveGigE 1/0/1.

[DeviceB] interface twenty-fivegige 1/0/1

[DeviceB-Twenty-FiveGigE1/0/1] sflow counter interval 30

# Specify sFlow collector 1 for counter sampling on Twenty-FiveGigE 1/0/1.

[DeviceB-Twenty-FiveGigE1/0/1] sflow counter collector 1

# Enable flow sampling and set the sampling interval to 20000 on Twenty-FiveGigE 1/0/1.

[DeviceB-Twenty-FiveGigE1/0/1] sflow sampling-rate 20000

# Specify sFlow collector 1 for flow sampling on Twenty-FiveGigE 1/0/1.

[DeviceB-Twenty-FiveGigE1/0/1] sflow flow collector 1

[DeviceB-Twenty-FiveGigE1/0/1] quit

Verifying the configuration

# Verify the following items on Device A:

·     Twenty-FiveGigE 1/0/1 and Twenty-FiveGigE 1/0/2 enabled with sFlow are active.

·     The counter sampling interval is 120 seconds.

·     The flow sampling interval is 10000.

[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

WGE1/0/1       1     120         1     128     10000     random        Active

WGE1/0/2       1     120         1     128     10000     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 Twenty-FiveGigE1/0/1

 port link-mode bridge

 port access vlan 10

 sflow flow collector 1

 sflow sampling-rate 10000

 sflow counter collector 1

 sflow counter interval 120

#

interface Twenty-FiveGigE1/0/2

 port link-mode bridge

 port access vlan 10

 sflow flow collector 1

 sflow sampling-rate 10000

 sflow counter collector 1

 sflow counter interval 120

#

interface Twenty-FiveGigE1/0/3

 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 Twenty-FiveGigE1/0/1

 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 Twenty-FiveGigE1/0/2

 port link-mode bridge

 port access vlan 20

#