HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 70
Static multicast routes, Changing an RPF route
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packet arrived is the RPF interface, the router forwards the packet to all the outgoing interfaces. Otherwise, it discards the packet. Assume that unicast routes are available in the network, MBGP is not configured, and no static multicast routes have been configured on Switch C, as shown in Figure 22. Multicast packets travel along the SPT from the multicast source to the receivers. The multicast forwarding table on Switch C contains the (S, G) entry, with VLAN-interface 20 as the incoming interface. Figure 22 RPF check process IP Routing Table on Switch C Destination/Mask Interface 192.168.0.0/24 Vlan-int20 Source Switch B Receiver Vlan-int10 192.168.0.1/24 Multicast packets Switch A Vlan-int20 Vlan-int10 Receiver Switch C • When a multicast packet arrives on interface VLAN-interface 20 of Switch C, because the interface is the incoming interface of the (S, G) entry, the router forwards the packet to all outgoing interfaces. • When a multicast packet arrives on interface VLAN-interface 10 of Switch C, because the interface is not the incoming interface of the (S, G) entry, the router performs an RPF check on the packet. The router searches its unicast routing table and finds that the outgoing interface to Source (the RPF interface) is VLAN-interface 20. This means the (S, G) entry is correct, and packet arrived along a wrong path. The RPF check fails and the packet is discarded. Static multicast routes A static multicast route is an important basis for RPF check. Depending on the application environment, a static multicast route can change an RPF route and create an RPF route. Changing an RPF route Typically, the topology structure of a multicast network is the same as that of a unicast network, and multicast traffic follows the same transmission path as unicast traffic does. You can configure a static multicast route for a given multicast source to change the RPF route to create a transmission path for multicast traffic that is different from that for unicast traffic. 59
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