Cisco Catalyst 2960-XR User manual

Catalyst 2960-XR Switch IP Multicast Routing Configuration Guide,
Cisco IOS Release 15.0(2)EX1
First Published: August 08, 2013
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Text Part Number: OL-29426-01

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CONTENTS
Preface Preface ix
Document Conventions ix
Related Documentation xi
Obtaining Documentation and Submitting a Service Request xi
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 9
Searching and Filtering Output of show and more Commands 10
Accessing the CLI through a Console Connection or through Telnet 11
CHAPTER 2 Understanding Cisco's Implementation of IP Multicast Routing 13
Cisco’s Implementation of IP Multicast Routing 13
Information About IGMP 14
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IGMP Versions 15
IGMP Version 1 15
IGMP Version 2 15
Default IGMP Configuration 15
Configuring Optional IGMP Features 16
Configuring the Switch as a Member of a Group 16
Controlling Access to IP Multicast Group 17
Changing the IGMP Version 19
Modifying the IGMP Host-Query Message Interval 20
Changing the IGMP Query Timeout for IGMPv2 22
Changing the Maximum Query Response Time for IGMPv2 23
Configuring the Switch as a Statically Connected Member 25
Configuration Examples for IGMP Features 26
Example: Configuring the Switch as a Member of a Multicast Group 26
Example: Controlling Access to IP Multicast Groups 27
Where to Go Next 27
Additional References 27
CHAPTER 3 Configuring CGMP 29
Finding Feature Information 29
Prerequisites for Configuring CGMP 29
Restrictions for CGMP 30
Information About CGMP 30
Enabling CGMP Server Support 30
Monitoring CGMP 32
Where to Go Next 33
Additional References 33
Feature History and Information for CGMP 34
CHAPTER 4 Configuring PIM 35
Finding Feature Information 35
Prerequisites for Configuring PIM 35
Prerequisites for Configuring PIM Stub Routing 35
Restrictions for PIM 36
Restrictions for Configuring Auto-RP and BSR 36
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Information About PIM 37
PIM Versions 37
PIMv1 and PIMv2 Interoperability 37
PIM Modes 38
PIM DM 38
PIM-SM 39
PIM Stub Routing 39
IGMP Helper 40
Auto-RP 40
Auto-RP Benefits 41
PIM v2 BSR 42
Multicast Forwarding and Reverse Path Check 42
PIM Shared Tree and Source Tree 44
Default PIM Routing Configuration 45
How to Configure PIM 45
Enabling PIM Stub Routing 45
Configuring a Rendezvous Point 47
Manually Assigning an RP to Multicast Groups 48
Setting Up Auto-RP in a New Internetwork 50
Adding Auto-RP to an Existing Sparse-Mode Cloud 52
Preventing Join Messages to False RPs 55
Filtering Incoming RP Announcement Messages 55
Configuring PIMv2 BSR 57
Defining the PIM Domain Border 58
Defining the IP Multicast Boundary 59
Configuring Candidate BSRs 61
Configuring the Candidate RPs 63
Configuring Auto-RP and BSR for the Network 64
Delaying the Use of PIM Shortest-Path Tree 66
Modifying the PIM Router-Query Message Interval 68
Monitoring PIM 69
Monitoring RP Mapping 70
Troubleshooting PIMv1 and PIMv2 Interoperability Problems 70
Configuration Examples for PIM 71
Example: Enabling PIM Stub Routing 71
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Example: Verifying PIM Stub Routing 71
Example: Manually Assigning an RP to Multicast Groups 72
Example: Configuring Auto-RP 72
Example: Defining the IP Multicast Boundary to Deny Auto-RP Information 72
Example: Filtering Incoming RP Announcement Messages 72
Example: Preventing Join Messages to False RPs 73
Example: Configuring Candidate BSRs 73
Example: Configuring Candidate RPs 74
Where to Go Next 74
Additional References 74
Feature History and Information for PIM 75
CHAPTER 5 Configuring SSM 77
Finding Feature Information 77
Prerequisites for Configuring SSM 77
Restrictions for Configuring SSM 78
Information About SSM 79
SSM Components Overview 79
SSM and Internet Standard Multicast (ISM) 79
SSM IP Address Range 80
SSM Operations 80
IGMPv3 Host Signalling 80
SSM Mapping 81
Static SSM Mapping 81
DNS-Based SSM Mapping 81
How to Configure SSM 82
Configuring SSM 82
Configuring Source Specific Multicast Mapping 83
Configuring Static SSM Mapping 84
Configuring DNS-Based SSM Mapping 85
Configuring Static Traffic Forwarding with SSM Mapping 87
Monitoring SSM 89
Monitoring SSM Mapping 89
Where to Go Next 89
Additional References 90
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Feature History and Information for SSM 91
CHAPTER 6 Configuring IP Multicast Routing 93
Finding Feature Information 93
Prerequisites for IP Multicast Routing 93
Restrictions for IP Multicast Routing 94
Information About IP Multicast Routing 94
Multicast Boundaries 94
Default IP Multicast Routing Configuration 95
How to Configure Basic IP Multicast Routing 96
Configuring Basic IP Multicast Routing 96
Configuring an IP Multicast Boundary 98
Configuring sdr Listener Support 100
Enabling sdr Listener Support 100
Limiting How Long an sdr Cache Entry Exists 101
Monitoring IP Multicast Routing 102
Configuration Examples for IP Multicast Routing 103
Example: Configuring an IP Multicast Boundary 103
Where to Go Next 103
Additional References 104
Feature History and Information for IP Multicast Routing 105
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Preface
This book describes configuration information and examples for IP multicast routing on the switch.
•Document Conventions, page ix
•Related Documentation, page xi
•Obtaining Documentation and Submitting a Service Request, page xi
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
•Catalyst 2960-XR Switch documentation, located at:
http://www.cisco.com/go/cat2960xr_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
•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
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.
You can start a CLI session through a console connection, through Telnet, a SSH, or by using the browser.
When you start a session, 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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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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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. This procedure is optional.
SUMMARY STEPS
1. terminal 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
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
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
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Configuring the Command History

PurposeCommand or Action
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. This procedure is optional.
SUMMARY STEPS
1. terminal 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
Enabling and Disabling Editing Features
Although enhanced editing mode is automatically enabled, you can disable it, and reenable it.
SUMMARY STEPS
1. terminal editing
2. terminal no editing
DETAILED STEPS
PurposeCommand or Action
Reenables the enhanced editing mode for the current terminal
session in the privileged EXEC mode.
terminal editing
Example:
Switch# terminal editing
Step 1
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Enabling and Disabling Editing Features

PurposeCommand or Action
Disables the enhanced editing mode for the current terminal session
in the privileged EXEC mode.
terminal no editing
Example:
Switch# terminal no editing
Step 2
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
Table 3: Editing Commands
DescriptionEditing Commands
Moves the cursor back one character.Ctrl-B or use the left arrow key
Moves the cursor forward one character.Ctrl-F or use the right arrow key
Moves the cursor to the beginning of the command
line.
Ctrl-A
Moves the cursor to the end of the command line.Ctrl-E
Moves the cursor back one word.Esc B
Moves the cursor forward one word.Esc F
Transposes the character to the left of the cursor with
the character located at the cursor.
Ctrl-T
Erases the character to the left of the cursor.Delete or Backspace key
Deletes the character at the cursor.Ctrl-D
Deletes all characters from the cursor to the end of
the command line.
Ctrl-K
Deletes all characters from the cursor to the beginning
of the command line.
Ctrl-U or Ctrl-X
Deletes the word to the left of the cursor.Ctrl-W
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Enabling and Disabling Editing Features