Cisco Catalyst 3850 series User manual

Cisco Flexible NetFlow Configuration Guide, Cisco IOS XE Release
3SE (Catalyst 3850 Switches)
First Published: January 29, 2013
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Text Part Number: OL-28354-01

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CONTENTS
Preface Preface v
Document Conventions v
Related Documentation vii
Obtaining Documentation and Submitting a Service Request vii
CHAPTER 1 Using the Command-Line Interface 1
Information About Using the Command-Line Interface 1
Command Modes 1
Using the Help System 3
Understanding Abbreviated Commands 4
No and default Forms of Commands 4
CLI Error Messages 4
Configuration Logging 5
How to Use the CLI to Configure Features 5
Configuring the Command History 5
Changing the Command History Buffer Size 6
Recalling Commands 6
Disabling the Command History Feature 7
Enabling and Disabling Editing Features 7
Editing Commands through Keystrokes 8
Editing Command Lines That Wrap 10
Searching and Filtering Output of show and more Commands 11
Accessing the CLI on a Switch Stack 12
Accessing the CLI through a Console Connection or through Telnet 12
CHAPTER 2 Configuring Flexible NetFlow 15
Finding Feature Information 15
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Prerequisites for Flexible NetFlow 15
Prerequisites for Wireless Flexible NetFlow 16
Restrictions for Flexible NetFlow 16
Information About Flexible NetFlow 17
Flexible NetFlow Overview 17
Wireless Flexible NetFlow Overview 18
Flow Records 19
Flexible NetFlow Match Parameters 19
Flexible NetFlow Collect Parameters 21
Exporters 22
Export Formats 23
Monitors 23
Samplers 24
Supported Flexible NetFlow Fields 24
Default Settings 28
How to Configure Flexible NetFlow 29
Creating a Flow Record 29
Creating a Flow Exporter 31
Creating a Flow Monitor 33
Creating a Sampler 35
Applying a Flow to an Interface 37
Configuring a Bridged NetFlow on a VLAN 38
Configuring Layer 2 NetFlow 39
Configuring WLAN to Apply Flow Monitor in Data Link Input/Output Direction 41
Configuring WLAN to Apply Flow Monitor in IPV4 and IPv6 Input/Output Direction 42
Monitoring Flexible NetFlow 43
Configuration Examples for Flexible NetFlow 43
Example: Configuring a Flow 43
Example: Configuring IPv4 Flexible NetFlow in WLAN (Ingress Direction) 44
Example: Configuring IPv6 and Transport Flag Flexible NetFlow in WLAN (Egress
Direction) 45
Example: Configuring IPv6 Flexible NetFlow in WLAN (Both Ingress and Egress
Directions) 45
Additional References 46
Feature Information for Flexible NetFlow 47
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Contents

Preface
This book describes configuration information and examples for Flexible NetFlow on the switch.
•Document Conventions, page v
•Related Documentation, page vii
•Obtaining Documentation and Submitting a Service Request, page vii
Document Conventions
This document uses the following conventions:
DescriptionConvention
Both the ^symbol and Ctrl represent the Control (Ctrl) key on a keyboard.
For example, the key combination ^D or Ctrl-D means that you hold
down the Control key while you press the D key. (Keys are indicated in
capital letters but are not case sensitive.)
^ or Ctrl
Commands and keywords and user-entered text appear in bold font.bold font
Document titles, new or emphasized terms, and arguments for which you
supply values are in italic font.
Italic font
Terminal sessions and information the system displays appear in courier
font.
Courier font
Bold Courier font indicates text that the user must enter.Bold Courier font
Elements in square brackets are optional.[x]
An ellipsis (three consecutive nonbolded periods without spaces) after
a syntax element indicates that the element can be repeated.
...
A vertical line, called a pipe, indicates a choice within a set of keywords
or arguments.
|
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DescriptionConvention
Optional alternative keywords are grouped in brackets and separated by
vertical bars.
[x | y]
Required alternative keywords are grouped in braces and separated by
vertical bars.
{x | y}
Nested set of square brackets or braces indicate optional or required
choices within optional or required elements. Braces and a vertical bar
within square brackets indicate a required choice within an optional
element.
[x {y | z}]
A nonquoted set of characters. Do not use quotation marks around the
string or the string will include the quotation marks.
string
Nonprinting characters such as passwords are in angle brackets.< >
Default responses to system prompts are in square brackets.[ ]
An exclamation point (!) or a pound sign (#) at the beginning of a line
of code indicates a comment line.
!, #
Reader Alert Conventions
This document uses the following conventions for reader alerts:
Means reader take note. Notes contain helpful suggestions or references to material not covered in the
manual.
Note
Means the following information will help you solve a problem.
Tip
Means reader be careful. In this situation, you might do something that could result in equipment damage
or loss of data.
Caution
Means the described action saves time. You can save time by performing the action described in the
paragraph.
Timesaver
Means reader be warned. In this situation, you might perform an action that could result in bodily
injury.
Warning
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Preface
Document Conventions

Related Documentation
Before installing or upgrading the switch, refer to the switch release notes.Note
• Cisco Catalyst 3850 Switch documentation, located at:
http://www.cisco.com/go/cat3850_docs
• Cisco SFP and SFP+ modules documentation, including compatibility matrixes, located at:
http://www.cisco.com/en/US/products/hw/modules/ps5455/tsd_products_support_series_home.html
• Cisco Validated Designs documents, located at:
http://www.cisco.com/go/designzone
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, submitting a service request, and gathering additional information,
see the monthly What's New in Cisco Product Documentation, which also lists all new and revised Cisco
technical documentation, at:
http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html
Subscribe to the What's New in Cisco Product Documentation as a Really Simple Syndication (RSS) feed
and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free
service and Cisco currently supports RSS version 2.0.
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Preface
Related Documentation

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Preface
Obtaining Documentation and Submitting a Service Request

CHAPTER 1
Using the Command-Line Interface
This chapter contains the following topics:
•Information About Using the Command-Line Interface, page 1
•How to Use the CLI to Configure Features, page 5
Information About Using the Command-Line Interface
This section describes the Cisco IOS command-line interface (CLI) and how to use it to configure your switch.
Command Modes
The Cisco IOS user interface is divided into many different modes. The commands available to you depend
on which mode you are currently in. Enter a question mark (?) at the system prompt to obtain a list of commands
available for each command mode.
When you start a session using Telnet, SSH, or console on the switch, you begin in user mode, often called
user EXEC mode. Only a limited subset of the commands are available in user EXEC mode. For example,
most of the user EXEC commands are one-time commands, such as show commands, which show the current
configuration status, and clear commands, which clear counters or interfaces. The user EXEC commands are
not saved when the switch reboots.
To have access to all commands, you must enter privileged EXEC mode. Normally, you must enter a password
to enter privileged EXEC mode. From this mode, you can enter any privileged EXEC command or enter
global configuration mode.
Using the configuration modes (global, interface, and line), you can make changes to the running configuration.
If you save the configuration, these commands are stored and used when the switch reboots. To access the
various configuration modes, you must start at global configuration mode. From global configuration mode,
you can enter interface configuration mode and line configuration mode.
This table describes the main command modes, how to access each one, the prompt you see in that mode, and
how to exit the mode.
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Table 1: Command Mode Summary
About This ModeExit MethodPromptAccess MethodMode
Use this mode to
• Change
terminal
settings.
• Perform basic
tests.
• Display
system
information.
Enter logout or
quit.
Switch>
Begin a session
using Telnet, SSH,
or console.
User EXEC
Use this mode to
verify commands
that you have
entered. Use a
password to protect
access to this mode.
Enter disable to
exit.
Switch#
While in user EXEC
mode, enter the
enable command.
Privileged EXEC
Use this mode to
configure
parameters that
apply to the entire
switch.
To exit to privileged
EXEC mode, enter
exit or end, or press
Ctrl-Z.
Switch(config)#
While in privileged
EXEC mode, enter
the configure
command.
Global
configuration
Use this mode to
configure VLAN
parameters. When
VTP mode is
transparent, you can
create
extended-range
VLANs (VLAN IDs
greater than 1005)
and save
configurations in the
switch startup
configuration file.
To exit to global
configuration mode,
enter the exit
command.
To return to
privileged EXEC
mode, press Ctrl-Z
or enter end.
Switch(config-vlan)#
While in global
configuration mode,
enter the vlan
vlan-id command.
VLAN
configuration
Use this mode to
configure
parameters for the
Ethernet ports.
To exit to global
configuration mode,
enter exit.
To return to
privileged EXEC
mode, press Ctrl-Z
or enter end.
Switch(config-if)#
While in global
configuration mode,
enter the interface
command (with a
specific interface).
Interface
configuration
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Using the Command-Line Interface
Command Modes

About This ModeExit MethodPromptAccess MethodMode
Line configuration Use this mode to
configure
parameters for the
terminal line.
To exit to global
configuration mode,
enter exit.
To return to
privileged EXEC
mode, press Ctrl-Z
or enter end.
Switch(config-line)#
While in global
configuration mode,
specify a line with
the line vty or line
console command.
Using the Help System
You can enter a question mark (?) at the system prompt to display a list of commands available for each
command mode. You can also obtain a list of associated keywords and arguments for any command.
SUMMARY STEPS
1. help
2. abbreviated-command-entry ?
3. abbreviated-command-entry <Tab>
4. ?
5. command ?
6. command keyword ?
DETAILED STEPS
PurposeCommand or Action
Obtains a brief description of the help system in any
command mode.
help
Example:
Switch# help
Step 1
Obtains a list of commands that begin with a particular
character string.
abbreviated-command-entry ?
Example:
Switch# di?
dir disable disconnect
Step 2
Completes a partial command name.
abbreviated-command-entry <Tab>
Example:
Switch# sh conf<tab>
Switch# show configuration
Step 3
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Using the Command-Line Interface
Using the Help System

PurposeCommand or Action
Lists all commands available for a particular command
mode.
?
Example:
Switch> ?
Step 4
Lists the associated keywords for a command.
command ?
Example:
Switch> show ?
Step 5
Lists the associated arguments for a keyword.
command keyword ?
Example:
Switch(config)# cdp holdtime ?
<10-255> Length of time (in sec) that receiver
Step 6
must keep this packet
Understanding Abbreviated Commands
You need to enter only enough characters for the switch to recognize the command as unique.
This example shows how to enter the show configuration privileged EXEC command in an abbreviated form:
Switch# show conf
No and default Forms of Commands
Almost every configuration command also has a no form. In general, use the no form to disable a feature or
function or reverse the action of a command. For example, the no shutdown interface configuration command
reverses the shutdown of an interface. Use the command without the keyword no to reenable a disabled feature
or to enable a feature that is disabled by default.
Configuration commands can also have a default form. The default form of a command returns the command
setting to its default. Most commands are disabled by default, so the default form is the same as the no form.
However, some commands are enabled by default and have variables set to certain default values. In these
cases, the default command enables the command and sets variables to their default values.
CLI Error Messages
This table lists some error messages that you might encounter while using the CLI to configure your switch.
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Using the Command-Line Interface
Understanding Abbreviated Commands

Table 2: Common CLI Error Messages
How to Get HelpMeaningError Message
Reenter the command followed by
a question mark (?) with a space
between the command and the
question mark.
The possible keywords that you can
enter with the command appear.
You did not enter enough
characters for your switch to
recognize the command.
% Ambiguous command: "show
con"
Reenter the command followed by
a question mark (?) with a space
between the command and the
question mark.
The possible keywords that you can
enter with the command appear.
You did not enter all the keywords
or values required by this
command.
% Incomplete command.
Enter a question mark (?) to display
all the commands that are available
in this command mode.
The possible keywords that you can
enter with the command appear.
You entered the command
incorrectly. The caret (^) marks the
point of the error.
% Invalid input detected at
‘^’ marker.
Configuration Logging
You can log and view changes to the switch configuration. You can use the Configuration Change Logging
and Notification feature to track changes on a per-session and per-user basis. The logger tracks each
configuration command that is applied, the user who entered the command, the time that the command was
entered, and the parser return code for the command. This feature includes a mechanism for asynchronous
notification to registered applications whenever the configuration changes. You can choose to have the
notifications sent to the syslog.
Only CLI or HTTP changes are logged.Note
How to Use the CLI to Configure Features
Configuring the Command History
The software provides a history or record of commands that you have entered. The command history feature
is particularly useful for recalling long or complex commands or entries, including access lists. You can
customize this feature to suit your needs.
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Using the Command-Line Interface
Configuration Logging

Changing the Command History Buffer Size
By default, the switch records ten command lines in its history buffer. You can alter this number for a current
terminal session or for all sessions on a particular line. These procedures are optional.
SUMMARY STEPS
1. terminal history [size number-of-lines]
2. history [size number-of-lines]
DETAILED STEPS
PurposeCommand or Action
Changes the number of command lines that the switch records during
the current terminal session in the privileged EXEC mode. You can
configure the size from 0 through 256.
terminal history [size number-of-lines]
Example:
Switch# terminal history size 200
Step 1
Configures the number of command lines the switch records for all
sessions on a particular line in the configuration mode. You can
configure the size from 0 through 256.
history [size number-of-lines]
Example:
Switch(config)# history size 200
Step 2
Recalling Commands
To recall commands from the history buffer, perform one of the actions listed in this table. These actions are
optional.
The arrow keys function only on ANSI-compatible terminals such as VT100s.Note
SUMMARY STEPS
1. Ctrl-P or use the up arrow key
2. Ctrl-N or use the down arrow key
3. show history
DETAILED STEPS
PurposeCommand or Action
Recalls commands in the history buffer, beginning with the most recent command.
Repeat the key sequence to recall successively older commands.
Ctrl-P or use the up arrow key
Step 1
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Using the Command-Line Interface
Configuring the Command History

PurposeCommand or Action
Returns to more recent commands in the history buffer after recalling commands
with Ctrl-P or the up arrow key. Repeat the key sequence to recall successively
more recent commands.
Ctrl-N or use the down arrow key
Step 2
Lists the last several commands that you just entered in privileged EXEC mode.
The number of commands that appear is controlled by the setting of the terminal
show history
Example:
Switch# show history
Step 3
history global configuration command and the history line configuration
command.
Disabling the Command History Feature
The command history feature is automatically enabled. You can disable it for the current terminal session or
for the command line. These procedures are optional.
SUMMARY STEPS
1. terminal no history
2. no history
DETAILED STEPS
PurposeCommand or Action
Disables the feature during the current terminal session in the
privileged EXEC mode.
terminal no history
Example:
Switch# terminal no history
Step 1
Disables command history for the line in the configuration
mode.
no history
Example:
Switch(config)# no history
Step 2
Enabling and Disabling Editing Features
Although enhanced editing mode is automatically enabled, you can disable it, reenable it, or configure a
specific line to have enhanced editing. These procedures are optional.
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Using the Command-Line Interface
Enabling and Disabling Editing Features

SUMMARY STEPS
1. no editing
2. terminal editing
3. editing
DETAILED STEPS
PurposeCommand or Action
Disables the enhanced editing mode.no editing
Example:
Switch(config)# no editing
Step 1
Reenables the enhanced editing mode for the current terminal
session in the privileged EXEC mode.
terminal editing
Example:
Switch# terminal editing
Step 2
Reconfigures a specific line to have enhanced editing mode.editing
Example:
Switch(config)# editing
Step 3
Editing Commands through Keystrokes
The keystrokes help you to edit the command lines. These keystrokes are optional.
The arrow keys function only on ANSI-compatible terminals such as VT100s.Note
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Using the Command-Line Interface
Enabling and Disabling Editing Features

SUMMARY STEPS
1. Ctrl-B or use the left arrow key
2. Ctrl-F or use the right arrow key
3. Ctrl-A
4. Ctrl-E
5. Esc B
6. Esc F
7. Ctrl-T
8. Ctrl-Y
9. Esc Y
10. Delete or Backspace key
11. Ctrl-D
12. Ctrl-K
13. Ctrl-U or Ctrl-X
14. Ctrl-W
15. Esc D
16. Esc C
17. Esc L
18. Esc U
19. Ctrl-V or Esc Q
20. Return key
21. Space bar
22. Ctrl-L or Ctrl-R
DETAILED STEPS
PurposeCommand or Action
Moves the cursor back one character.Ctrl-B or use the left arrow
key
Step 1
Moves the cursor forward one character.Ctrl-F or use the right arrow
key
Step 2
Moves the cursor to the beginning of the command line.Ctrl-A
Step 3
Moves the cursor to the end of the command line.Ctrl-E
Step 4
Moves the cursor back one word.Esc B
Step 5
Moves the cursor forward one word.Esc F
Step 6
Transposes the character to the left of the cursor with the character located
at the cursor.
Ctrl-T
Step 7
Recalls the most recent entry in the buffer.Ctrl-Y
Step 8
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Using the Command-Line Interface
Enabling and Disabling Editing Features

PurposeCommand or Action
Recall commands from the buffer and paste them in the command line. The
switch provides a buffer with the last ten items that you deleted.
Recalls the next buffer entry.Esc Y
Step 9
The buffer contains only the last 10 items that you have deleted or cut. If you
press Esc Y more than ten times, you cycle to the first buffer entry.
Erases the character to the left of the cursor.Delete or Backspace key
Step 10
Deletes the character at the cursor.Ctrl-D
Step 11
Deletes all characters from the cursor to the end of the command line.Ctrl-K
Step 12
Deletes all characters from the cursor to the beginning of the command line.Ctrl-U or Ctrl-X
Step 13
Deletes the word to the left of the cursor.Ctrl-W
Step 14
Deletes from the cursor to the end of the word.Esc D
Step 15
Capitalizes at the cursor.Esc C
Step 16
Changes the word at the cursor to lowercase.Esc L
Step 17
Capitalizes letters from the cursor to the end of the word.Esc U
Step 18
Designates a particular keystroke as an executable command, perhaps as a
shortcut.
Ctrl-V or Esc Q
Step 19
Scrolls down a line or screen on displays that are longer than the terminal
screen can display.
Return key
Step 20
The More prompt is used for any output that has more lines than can
be displayed on the terminal screen, including show command
output. You can use the Return and Space bar keystrokes whenever
you see the More prompt.
Note
Scrolls down one screen.Space bar
Step 21
Redisplays the current command line if the switch suddenly sends a message
to your screen.
Ctrl-L or Ctrl-R
Step 22
Editing Command Lines That Wrap
You can use a wraparound feature for commands that extend beyond a single line on the screen. When the
cursor reaches the right margin, the command line shifts ten spaces to the left. You cannot see the first ten
characters of the line, but you can scroll back and check the syntax at the beginning of the command. The
keystroke actions are optional.
To scroll back to the beginning of the command entry, press Ctrl-B or the left arrow key repeatedly. You can
also press Ctrl-A to immediately move to the beginning of the line.
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Using the Command-Line Interface
Enabling and Disabling Editing Features

The arrow keys function only on ANSI-compatible terminals such as VT100s.Note
The following example shows how to wrap a command line that extend beyond a single line on the screen.
SUMMARY STEPS
1. access-list
2. Ctrl-A
3. Return key
DETAILED STEPS
PurposeCommand or Action
Displays the global configuration command entry that extends beyond
one line.
access-list
Example:
Switch(config)# access-list 101 permit tcp
Step 1
When the cursor first reaches the end of the line, the line is shifted ten
spaces to the left and redisplayed. The dollar sign ($) shows that the
line has been scrolled to the left. Each time the cursor reaches the end
of the line, the line is again shifted ten spaces to the left.
10.15.22.25 255.255.255.0 10.15.22.35
Switch(config)# $ 101 permit tcp
10.15.22.25 255.255.255.0 10.15.22.35
255.25
Switch(config)# $t tcp 10.15.22.25
255.255.255.0 131.108.1.20 255.255.255.0
eq
Switch(config)# $15.22.25 255.255.255.0
10.15.22.35 255.255.255.0 eq 45
Checks the complete syntax.Ctrl-A
Step 2
Example:
Switch(config)# access-list 101 permit tcp
10.15.22.25 255.255.255.0 10.15.2$
The dollar sign ($) appears at the end of the line to show that the line
has been scrolled to the right.
Execute the commands.Return key
Step 3
The software assumes that you have a terminal screen that is 80 columns
wide. If you have a different width, use the terminal width privileged
EXEC command to set the width of your terminal.
Use line wrapping with the command history feature to recall and
modify previous complex command entries.
Searching and Filtering Output of show and more Commands
You can search and filter the output for show and more commands. This is useful when you need to sort
through large amounts of output or if you want to exclude output that you do not need to see. Using these
commands is optional.
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Using the Command-Line Interface
Searching and Filtering Output of show and more Commands

SUMMARY STEPS
1. {show |more}command | {begin |include |exclude}regular-expression
DETAILED STEPS
PurposeCommand or Action
Searches and filters the output.
{show |more}command | {begin |include |exclude}
regular-expression
Step 1
Expressions are case sensitive. For example, if you enter
| exclude output, the lines that contain output are not
displayed, but the lines that contain output appear.
Example:
Switch# show interfaces | include protocol
Vlan1 is up, line protocol is up
Vlan10 is up, line protocol is down
GigabitEthernet1/0/1 is up, line protocol is down
GigabitEthernet1/0/2 is up, line protocol is up
Accessing the CLI on a Switch Stack
You can access the CLI through a console connection, through Telnet, or by using the browser.
You manage the switch stack and the stack member interfaces through the active switch. You cannot manage
stack members on an individual switch basis. You can connect to the active switch through the console port
or the Ethernet management port of one or more stack members. Be careful with using multiple CLI sessions
to the active switch. Commands that you enter in one session are not displayed in the other sessions. Therefore,
it is possible to lose track of the session from which you entered commands.
We recommend using one CLI session when managing the switch stack.Note
If you want to configure a specific stack member port, you must include the stack member number in the CLI
command interface notation.
To debug a specific stack member, you can access it from the active switch by using the session
stack-member-number privileged EXEC command. The stack member number is appended to the system
prompt. For example, Switch-2# is the prompt in privileged EXEC mode for stack member 2, and where the
system prompt for the active switch is Switch. Only the show and debug commands are available in a CLI
session to a specific stack member.
Accessing the CLI through a Console Connection or through Telnet
Before you can access the CLI, you must connect a terminal or a PC to the switch console or connect a PC to
the Ethernet management port and then power on the switch, as described in the hardware installation guide
that shipped with your switch.
If your switch is already configured, you can access the CLI through a local console connection or through a
remote Telnet session, but your switch must first be configured for this type of access.
Cisco Flexible NetFlow Configuration Guide, Cisco IOS XE Release 3SE (Catalyst 3850 Switches)
12 OL-28354-01
Using the Command-Line Interface
Accessing the CLI on a Switch Stack