If you have mastered multicast on the Cisco routers and switches, then you have a huge head start on the Cisco Adaptive Security Appliance (ASA). In this post, we will examine multicast on this Cisco security device.

In order to enjoy multicast routing support on the Cisco ASA, you must first enable it. This is done with the following Global Configuration command:

multicast-routing

This command has a very powerful effect on the Cisco ASA. IGMP and PIM are enabled on all interfaces by default. In order to reverse this for any interface, use the following commands:
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Common Issues with IGMP

IGMP is a very simple protocol to troubleshoot. IGMP uses a simple operational mechanism to accomplish its duties forwarding multicast packets. Even though the overall process is simple, dividing it into specific phases makes troubleshooting more straightforward. To simplify troubleshooting common issues while deploying IGMP, we identify three categories of problems: Host Fails to Send IGMP Joins, Switch Fails to Forward IGMP Packets, and IGMP Packet Filtering.

Host Fails to Send IGMP joins

This section deals specifically with IGMP version 2 because it is the default IGMP version employed by Cisco IOS. It is important to note that successful troubleshooting of IGMP depends on role-based operations within the protocol. A host failing to send a IGMP membership report is a common issue encountered while deploying IGMP. In effect, this means that a host is not notifying the IGMP router that it has joined a multicast group.
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Today Monday, March 5, 2012, at 5 PM EST/USA IPexpert is releasing version 1.1 of the celebrated IPv4/6 Multicast Operation and Troubleshooting text. This new update is delivered free of charge to all readers that purchased the original volume. It will appear automatically in the IPexpert Members Area.

This new update includes some cosmetic fixes to the text, some repaired grammar errors, and includes the Chapter 14 end-of-chapter challenge Trouble Tickets of Chapter 14: IPv6 Multicast.
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Monday, March 5, 2012, IPexpert is releasing version 1.1 of the celebrated IPv4/6 Multicast Operation and Troubleshooting text. This new update is delivered free of charge to all readers that purchased the original volume. It will appear automatically in the IPexpert Members Area.

This new update includes some cosmetic fixes to the text and includes the Chapter 14 end-of-chapter challenge Trouble Tickets that complete Chapter 14: IPv6 Multicast.

For questions or feedback regarding the new book, email compsolv@me.com.
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Anthony Sequeira CCIE, CCSI
Twitter: @compsolv
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