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• Query—Its IGMP Type field is set to 0x1F
• Request—Its IGMP Type field is set to 0x1F
• Response—Its IGMP Type field is set to 0x1E
Process of multicast traceroute
1. The querier sends a query to the last-hop router.
2. After receiving the query, the last-hop router turns the query packet into a request packet by adding
a response data block—which contains its interface addresses and packet statistics—to the end of
the packet. It then forwards the request packet through 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 forwards it through unicast to the previous hop.
4. When the first-hop router receives the request packet, it changes the packet type to indicate a
response packet. Then, it sends the completed packet through unicast to the querier.
Configuration task list
Complete these tasks to configure multicast routing and forwarding:
Task Remarks
Enabling IP multicast routing Optional
Configuring multicast routing and
forwarding
Configuring multicast static routes Optional
Configuring a multicast routing
policy
Optional
Configuring a multicast forwarding
range
Optional
Configuring the multicast
forwarding table size
Optional
Tracing a multicast path Optional
CAUTION:
IP multicast does not support secondary IP address segments. Namely, multicast can be routed and
forwarded only through primary IP addresses even if secondary addresses are configured on
interfaces. For more information about primary and secondary IP addresses, see the
Layer 3—IP
Services Configuration Guide
.
Enabling IP multicast routing
Before you configure any Layer 3 multicast functionality, you must enable IP multicast routing.
Enabling IP multicast routing for the public network
Follow these steps to enable IP multicast routing for the public network:
To do... Use the command... Remarks
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