Operation Manual – Multicast Protocol
H3C S3610&S5510 Series Ethernet Switches
Chapter 8 Multicast Routing and Forwarding
Configuration
8-6
z
Request, with the IGMP Type field set to 0x1F, and
z
Response, with the IGMP Type field set to 0x1E.
III. Process of multicast traceroute
1)
The querier sends a query to the last-hop router.
2)
Upon receiving the query, the last-hop router turns the query packet into a request
packet by adding a response data block containing its interface addresses and
packet statistics to the end of 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.
8.2 Configuration Task List
Complete these tasks to configure multicast routing and forwarding:
Task
Remarks
Required
Configuring Multicast Static Routes
Optional
Configuring a Multicast Route Match Rule
Optional
Configuring Multicast Load Splitting
Optional
Configuring a Multicast Forwarding Range
Optional
Configuring the Multicast Forwarding Table Size
Optional
Optional
8.3 Configuring Multicast Routing and Forwarding
8.3.1 Configuration Prerequisites
Before configuring multicast routing and forwarding, complete the following tasks:
z
Configure a unicast routing protocol so that all devices in the domain are
interoperable at the network layer.
z
Enable PIM (PIM-DM or PIM-SM).
Before configuring multicast routing and forwarding, prepare the following data:
z
The minimum TTL value required for a multicast packet to be forwarded
z
The maximum number of downstream nodes for a single route in a multicast
forwarding table
