Инструкции По Установке для 3com S7906E
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the packet, and forwards the request packet via unicast to the previous hop for the given multicast
source and group.
3) From the last-hop router to the multicast source, each hop adds a response data block to the end of
the request packet and unicasts it to the previous hop.
4) When the first-hop router receives the request packet, it changes the packet type to indicate a
response packet, and then sends the completed packet via unicast to the multicast traceroute
querier.
Configuration Task List
Complete these tasks to configure multicast routing and forwarding:
Task
Remarks
Optional
Optional
Optional
Optional
Optional
Optional
Optional
IP multicast does not support the use of secondary IP address segments. Namely, multicast can be
routed and forwarded only through primary IP addresses, rather than secondary addresses, even if
configured on interfaces.
For details about primary and secondary IP addresses, refer to IP Addressing Configuration in the IP
Services Volume.
Enabling IP Multicast Routing
Before configuring any Layer 3 multicast functionality, you must enable IP multicast routing.
Enabling IP multicast routing in the public instance
Follow these steps to enable IP multicast routing in the public instance:
To do...
Use the command...
Remarks
Enter system view
system-view
—
Enable IP multicast routing
multicast routing-enable
Required
Disabled by default