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Chapter 6

IP Multicast in a Site-to-Site VPN

Multicast VPN Deployment Recommendations

Following is the configuration of static routes on VPN-Branch-1.

! Route anything going to VPN-HE-1 and VPN-HE-2 to the ISP ip route 131.108.1.1 255.255.255.255 131.108.101.2 ip route 131.108.1.5 255.255.255.255 131.108.101.2

Tip

See the Cisco AVVID Network Infrastructure Enterprise Site-to-Site VPN Design SRND for more on static and dynamic routing with VPN.

Multicast VPN Deployment Recommendations

This chapter discusses the recommended and optional configurations for IP multicast WAN deployment. The recommended guidelines are summarized below:

Use IP Multicast to scale streaming applications, such as Music-on-Hold and IP/TV. Use administratively scoped addresses to differentiate multicast applications by type and bandwidth. Use Anycast RP.

Select Catalyst switches that have IGMP snooping and use CGMP in low-end switches that do not support IGMP snooping.

Use the recommended commands to ensure that the correct RPs and sources are used. Use IP Multicast boundaries to control where certain multicast streams go.

Use “show” commands to ensure proper operation of the multicast configurations and enable SNMP traps to log multicast events.

Multicast Site-to-Site VPN Deployment

The VPN topology, shown in Figure 6-4, is based on a dual-VPN head-end model.

There are a few different design scenarios that can be used with IP Multicast when using a site-to-site VPN deployment. The design in this chapter uses RPs that are located in the campus network. IP multicast configuration for the campus is covered in Chapter 2, “IP Multicast in a Campus Network.” In this chapter, a brief configuration for the campus RPs is shown for reference.

For IP multicast forwarding, the branch sites use the appropriate VPN head-end router to which they have a primary tunnel connection. If there is a failure in the VPN head-end router, the branch will use the secondary tunnel configuration to receive IP multicast traffic and will receive an update stating which device to use as the RP for the specified groups.

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