Multicast Resilience Configuration Guide

Bias-Free Language

The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.

Book Contents
Find Matches in This Book
Available Languages

Results

Updated:
November 24, 2010

Chapter: Multicast Live-Live


Multicast Live-Live

First Published: November 24, 2010
Last Updated: November 24 , 2010

The Multicast Live-Live feature delivers two multicast streams with the same content over diverse paths in the network. This functionality reduces packet loss due to network failures on any one of the paths.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Multicast Live-Live" section.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for Multicast Live-Live

•Restrictions for Multicast Live-Live

•Information About Multicast Live-Live

•How to Configure Multicast Live-Live

•Configuration Examples for Multicast Live-Live

•Additional References

•Feature Information for Multicast Live-Live

Prerequisites for Multicast Live-Live

•The Multicast Live-Live feature requires multitopology Interior Gateway Protocol (IGP) support.

Restrictions for Multicast Live-Live

•Multicast traffic splitting and merging is the responsibility of the application. Applications that use multicast technology include video conferencing, corporate communications, distance learning, and distribution of software, stock quotes, and news.

•Multicast Live-Live is supported for the IPv4 multicast address family.

•Multicast Live-Live is supported for global Virtual Routing and Forwarding (VRF).

•Multicast Live-Live is supported for Protocol Independent Multicast Source-Specific Multicast (PIM-SSM) mode and PIM Sparse Mode (PIM-SM).

•Multicast Live-Live is supported for the Intermediate System-to-Intermediate System (IS-IS) IGP.

Information About Multicast Live-Live

•Overview of Multicast Live-Live

Overview of Multicast Live-Live

This feature delivers two multicast streams with the same content over diverse paths in the network. This functionality reduces packet loss due to network failures on any one of the paths. The feature uses multitopology IGP technology in order to deliver the two streams over diverse paths.

The Multicast Live-Live feature can be divided into three distinct processes as shown in Figure 1. The processes are visually separated by vertical lines in the figure.

•The first process consists of splitting the multicast stream into dual streams. The splitting is performed by the application.

•The second process consists of transmitting the dual streams over the network. Topology selection for transmitting these dual streams can be done in two different ways:

–Multicast topology selection by group range: This action allows multicast Reverse Path Forwarding (RPF) lookups to perform the RPF check against more than one RPF topology.

–Multicast topology selection by source prefix: This action allows the replication of routes from more than one (unicast) topology into multicast topology.

•The third process consists of merging the streams that have been split. The merging is performed by the application.

Figure 1 Overview of Multicast Live-Live

How to Configure Multicast Live-Live

This section contains the following tasks:

•Configuring a Multicast Topology (required)

•Enabling a Multicast Topology Under IGP (required)

•Verifying the Configuration of Multicast Live-Live (optional)

Configuring a Multicast Topology

Perform this task to configure a multicast topology.

SUMMARY STEPS

1. enable

2. configure terminal

3. ip multicast-routing

4. ip multicast rpf multitopology

5. global-address-family ipv4 [multicast | unicast]

6. topology {base | topology-name}

7. Repeat Step 6 to configure another global topology instance.

8. exit

9. interface type number

10. ip address ip-address mask [secondary [vrf vrf-name]]

11. ip pim sparse-dense-mode

12. ip router isis

13. topology ipv4 [multicast | unicast] {topology-name [disable] | base}

14. exit

15. Repeat Steps 9 through 14 for each interface to be configured.

16. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

ip multicast-routing

Example:

Router(config)# ip multicast-routing

Enables IP multicast routing.

Step 4 

ip multicast rpf multitopology

Example:

Router(config)# ip multicast rpf multitopology

Enables multicast RPF lookup in multiple topologies.

Step 5 

global-address-family ipv4 [multicast | unicast]

Example:

Router(config)# global-address family ipv4 multicast

Enters global address family configuration mode to configure a topology.

Step 6 

topology {base | topology-name}

Example:

Router(config-af)# topology live-A

Configures a global topology instance.

Step 7 

Repeat Step 6 to configure another global topology instance.

—

Step 8 

exit

Example:

Router(config-af)# exit

Exits global address family configuration mode and returns to global configuration mode.

Step 9 

interface type number

Example:

Router(config)# interface Gigabitethernet 1/0

Enters interface configuration mode for the specified interface type and number.

Step 10 

ip address ip-address mask [secondary [vrf vrf-name]]

Example:

Router(config-if)# ip address 10.1.1.1 255.255.255.0

Sets a primary or secondary IP address for an interface.

Step 11 

ip pim sparse-dense-mode

Example:

Router(config-if)# ip pim sparse-dense-mode

Enables PIM sparse dense mode on the interface.

Step 12 

ip router isis

Example:

Router(config-if)# ip router isis

Configures an Intermediate System-to-Intermediate System (IS-IS) routing process for IP on the interface.

Step 13 

topology ipv4 [multicast | unicast] {topology-name [disable] | base}

Example:

Router(config-if)# topology ipv4 multicast live-A

Configures a topology instance on an interface.

Step 14 

exit

Example:

Router(config-if)# exit

Exits interface configuration mode and returns to global configuration mode.

Step 15 

Repeat Steps 9 through 14 for each interface to be configured.

—

Step 16 

end

Example:

Router(config)# end

Ends the current configuration session and returns to privileged EXEC mode.

Enabling a Multicast Topology Under IGP

Perform this task to enable a multicast topology under IGP.

SUMMARY STEPS

1. enable

2. configure terminal

3. router isis

4. net net1

5. metric-style wide [transition] [level-1 | level-2 | level-1-2]

6. address-family ipv4 [multicast | unicast]

7. topology topology-name tid number

8. Repeat Step 7 to enable an additional multicast topology under IGP.

9. exit

10. ip multicast topology {multicast | unicast} topology-name tid topology-number

11. Repeat Step 10 to assign an additional multicast identifier to a topology.

12. ip multicast rpf select topology {multicast | unicast} topology-name access-list-number

13. Repeat Step 12 to specify an additional topology for a RPF lookup.

14. ip access-list {standard | extended} {access-list-name | access-list-number}

15. permit protocol {{source-addr source-wildcard} | object-group object-group-name | any | host {address | name}} {destination-addr destination-wildcard} | object-group object-group-name | any | host {address | name}}

16. Repeat Steps 14 and 15 to enumerate an additional (S,G) mroute entry if required.

17. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

router isis

Example:

Router(config)# router isis

Enables the IS-IS routing protocol and specifies an IS-IS process.

Step 4 

net net1

Example:

Router(config)# net 49.1234.1234.1234.00

Configures an IS-IS network entity (NET) for the routing process.

Step 5 

metric-style wide [transition] [level-1 | level-2 | level-1-2]

Example:

Router(config-router)# metric-style wide

Configures a router running IS-IS so that it generates and accepts only new-style type, length, value objects (TLVs).

Step 6 

address-family ipv4 [multicast | unicast]

Example:

Router(config-router)# address-family ipv4 multicast

Enters router address family configuration mode under IS-IS router configuration mode.

Step 7 

topology topology-name tid number

Example:

Router(config-router-af)# topology live-A tid 10

Enables a multicast topology under IGP.

Step 8 

Repeat Step 7 to enable an additional multicast topology under IGP.

—

Step 9 

exit

Example:

Router(config-router)# exit

Exits router configuration mode and returns to global configuration mode.

Step 10 

ip multicast topology {multicast | unicast} topology-name tid topology-number

Example:

Router(config)# ip multicast topology multicast live-A tid 100

Assigns a multicast topology identifier to a topology.

Step 11 

Repeat Step 10 to assign an additional multicast identifier to a topology.

—

Step 12 

ip multicast rpf select topology {multicast | unicast} topology-name access-list-number

Example:

Router(config)# ip multicast rpf select topology multicast live-A 111

Associates a multicast topology with a multicast group that has a specific (S,G) mroute entry. The notation of (S,G), pronounced "S comma G," enumerates a shortest path tree where S is the IP address of the source and G is the multicast group address.

Step 13 

Repeat Step 12 to specify an additional topology for an RPF lookup.

—

Step 14 

ip access-list {standard | extended} {access-list-name | access-list-number}

Example:

Router(config)# ip access-list extended 111

Specifies a (S,G) mroute entry using IP access list.

Step 15 

permit protocol {{source-addr source-wildcard} | object-group object-group-name | any | host {address | name}} {destination-addr destination-wildcard} | object-group object-group-name | any | host {address | name}}

Example:

Router(config-ext-nacl)# permit ip any 225.1.1.1 0.0.0.0

Set conditions in the named IP access list that will permit (S,G) mroute entry multicast packets.

Step 16 

Repeat Steps 14 and 15 to enumerate an additional (S,G) mroute entry if required.

—

Step 17 

end

Example:

Router(config-ext-nacl)# end

Ends the current configuration session and returns to privileged EXEC mode.

Verifying the Configuration of Multicast Live-Live

Perform this task to verify the configuration of the Multicast Live-Live feature.

SUMMARY STEPS

1. enable

2. show ip multicast topology [{multicast | unicast} topology-name]

DETAILED STEPS

Step 1 enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Example:

Router> enable


Step 2 show ip multicast topology [{multicast | unicast} topology-name]

Enter the show ip multicast topology command to display multicast topology information: 

Router# show ip multicast topology multicast live-A


Topology: ipv4 multicast live-A

TID: 1

 Extended IP ACL: 101

Associated VPN VRF is IPv4 default

Configuration Examples for Multicast Live-Live

•Example: Configuring Multicast Live-Live

Example: Configuring Multicast Live-Live

The following example shows how to configure the Multicast Live-Live feature. In the example, two multicast topologies are enabled under IGP, the multicast topologies are assigned a topology identifier, and each multicast topology identifier is associated with a multicast group that has a specific (S,G) mroute entry. 

ip multicast-routing

! Enable multi-topology mode 

ip multicast rpf multitopology

! Create 2 IPv4 multicast topologies 

global-address-family ipv4 multicast 

  topology live-A

  topology live-B

interface Gigabitethernet 1/0

 ip address 10.1.1.1 255.255.255.0

 ip pim sparse-dense-mode

 ip router isis

 topology ipv4 multicast live-A


interface Gigabitethernet 2/0

 ip address 2.2.2.2 255.255.255.0

 ip pim sparse-dense-mode

 ip router isis

 topology ipv4 multicast live-B


router isis

 net 49.1234.1234.1234.00

  metric-style wide

  address-family ipv4 multicast 


  ! CLIs to enable 2 multicast topologies under IGP


  topology live-A tid 10

  topology live-B tid 20


! CLIs to assign multicast tid to topology


ip multicast topology multicast live-A tid 100

ip multicast topology multicast live-B tid 200


! CLIs to specify topology for RPF lookup

ip multicast rpf select topology multicast live-A 111 

ip multicast rpf select topology multicast live-B 122 


! Use IP access-list extended to specify (S, G)


ip access-list extended 111 

 permit ip any   225.1.1.1 0.0.0.0 


ip access-list extended 122 

 permit ip any   239.1.1.1 0.0.0.0

Additional References

Related Documents

Related Topic
Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Overview of the IP multicast technology area

"IP Multicast Technology Overview" module

Concepts, tasks, and examples for configuring an IP multicast network using PIM

"Configuring a Basic IP Multicast Network" module

IP multicast commands: complete command syntax, command mode, defaults, command history, usage guidelines, and examples

Cisco IOS IP Multicast Command Reference


Standards

Standard
Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—


MIBs

MIB
MIBs Link

No new or modified MIBs are supported.

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFC
Title

No new or modified RFCs are supported, and support for existing standards has not been modified.

—


Technical Assistance

Description
Link

The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html


Feature Information for Multicast Live-Live

Table 1 lists the release history for this feature.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Table 1 Feature Information for Multicast Live-Live

Feature Name
Releases
Feature Information

Multicast Live-Live

Cisco IOS XE Release 3.2S

The Multicast Live-Live feature delivers two multicast streams with the same content over diverse paths in the network. This functionality reduces packet loss due to network failures on any one of the paths.

The following commands were introduced or modified: debug ip multicast topology, ip multicast rpf select topology, ip multicast topology, show ip multicast topology.


.Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2010 Cisco Systems, Inc. All rights reserved.

Was this Document Helpful?

FeedbackFeedback

Contact Cisco