HP 6125G HP 6125G & 6125G/XG Blade Switches IP Multicast Configuration - Page 264
Configuration task list, Enabling IPv6 multicast routing
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Assume that IPv6 unicast routes are available in the network, IPv6 MBGP is not configured, and IPv6 multicast packets travel along the SPT from the multicast source to the receivers, as shown in Figure 71. The IPv6 multicast forwarding table on Router C contains the (S, G) entry, with VLAN-interface 20 as the RPF interface. Figure 71 RPF check process IPv6 Routing Table on Router C Destination/Prefix Interface 2000::/16 Vlan-int20 Source Router B Receiver Vlan-int10 2000::101/16 Router A Vlan-int20 Vlan-int10 IPv6 Multicast packets Router C Receiver • When an IPv6 multicast packet arrives on VLAN-interface 20 of Router C, because the interface is the incoming interface of the (S, G) entry, the router forwards the packet to all outgoing interfaces. • When an IPv6 multicast packet arrives on VLAN-interface 10 of Router 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 IPv6 unicast routing table and finds that the outgoing interface to Source (the RPF interface) is VLAN-interface 20. This means that the (S, G) entry is correct and the packet arrived along a wrong path. The RPF check fails and the packet is discarded. Configuration task list Task Enabling IPv6 multicast routing Configuring IPv6 multicast routing and forwarding Configuring an IPv6 multicast routing policy Configuring an IPv6 multicast forwarding range Configuring the IPv6 multicast forwarding table size Remarks Required Optional Optional Optional Enabling IPv6 multicast routing Before you configure any Layer 3 IPv6 multicast functionality, you must enable IPv6 multicast routing. To enable IPv6 multicast routing: Step 1. Enter system view. Command system-view Remarks N/A 253
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