3com S7906E Installationsanweisungen
1-4
Figure 1-1 RPF check process
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When an IPv6 multicast packet arrives on Vlan-interface20 of Router C, as the interface is the
incoming interface of the (S, G) entry, the router forwards the packet to all outgoing interfaces.
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When an IPv6 multicast packet arrives on Vlan-interface10 of Router C, as 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-interface20. This means the (S, G) entry is correct and packet arrived along a
wrong path. The RPF check fails and the packet is discarded.
Configuration Task List
Complete these tasks to configure IPv6 multicast routing and forwarding:
Task
Remarks
Optional
Optional
Optional
Optional
Optional
Enabling IPv6 Multicast Routing
Before configuring any Layer 3 IPv6 multicast functionality, you must enable IPv6 multicast routing.
Follow these steps to enable IPv6 multicast routing:
To do…
Use the Command…
Remarks
Enter system view
system-view
—
Enable IPv6 multicast routing
multicast ipv6 routing-enable
Required
Disabled by default