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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Multicast Static Route

Multicast Static Route

RPF checks can be performed using multicast static routes. Multicast static routes can be used to change and connect RPF routes.

Changing RPF Routes

You can change RPF routes on a network by configuring multicast static routes. Multicast data can then be transmitted along a different path from unicast data.

In Figure 8-3, RouterA is the RPF neighbor of RouterC towards the multicast source (Source). Multicast packets sent from Source are transmitted along the path Source → RouterA → RouterC. If you configure a multicast static route on RouterC and specify RouterB as the RPF neighbor, the transmission path of multicast packets sent from Source changes to Source → RouterA → RouterB → RouterC. In this way, the multicast path diverges from the unicast path.
Figure 8-3 Configuring a multicast static route to change the RPF route

Connecting RPF Routes

When unicast routes on a multicast network are incomplete, multicast packets cannot be forwarded due to a lack of an RPF route. In this case, multicast static routes can be configured on the network to generate new RPF routes. Multicast routers then create new multicast forwarding entries to guide multicast data forwarding.

In Figure 8-4, Domain1 and Domain2 are routing domains (RIP and OSPF domains for example). The domains have no unicast route to each other, so receivers in Domain2 cannot receive data from the multicast source in Domain1. To enable receivers to receive data from the multicast source, configure multicast static routes on RouterC and RouterD in Domain2. On RouterC, specify RouterB as the RPF neighbor. On RouterD, specify RouterC as the RPF neighbor.
Figure 8-4 Configuring multicast static routes to connect RPF routes

Multicast static routes are local to the router where they are configured and are not advertised or redistributed to any other router.

Updated: 2019-04-20

Document ID: EDOC1100074724

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