IP multicast allows a host to send packets to a subset of all hosts
(group transmission). These hosts are known as group members.
Routers executing a multicast routing protocol, such as Protocol Independent Multicast (PIM), maintain forwarding tables to forward multicast datagrams. Routers use the Internet Group Management Protocol (IGMP) to learn whether members of a group are present on their directly attached subnets. Hosts join multicast groups by sending IGMP report messages.
The basic steps to configure IP multicast routing
Step 1: Enable ip multicast routing
SW(config)# ip multicast-routing
Step 2: Enable PIM on an Interface
SW(config-if)# ip pim sparse-mode
or
SW(config-if)# ip pim dense-mode
Step 3: Configuring RP
If you configure PIM to operate in sparse mode, you must also choose one or more routers to be rendezvous points (RPs). You need not configure the routers to be RPs; they learn how to become RPs themselves.
There are types RPs: non auto and auto
Configure a non-auto RP
ip pim rp-address rp-address
Configure a auto RP:
announcing the RP and the group range it serves:
ip pim send-rp-announce type number scope ttl-value [group-list access-list] [interval seconds]
assigning the RP mapping agent:
ip pim send-rp-discovery scope ttl-value
Note:
If you configure PIM in sparse mode or sparse-dense mode and do not configure Auto-RP, you must statically configure an non-auto RP
Sometimes:
Use the ip pim autorp listener command with interfaces configured for PIM sparse mode operation in order to establish a network configuration where Auto-RP operates in PIM dense mode and multicast traffic can operate in sparse mode, bidirectional mode, or source specific multicast (SSM) mode
Examples
IP is particularly suited for multimedia applications that involve multiple participants. Issue the following show commands from the CLI to verify multicast configurations on your devices:
Configuring IP Multicast Routing: www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfmulti.html#wp1000948
http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult2.html#wp1090395
Routers executing a multicast routing protocol, such as Protocol Independent Multicast (PIM), maintain forwarding tables to forward multicast datagrams. Routers use the Internet Group Management Protocol (IGMP) to learn whether members of a group are present on their directly attached subnets. Hosts join multicast groups by sending IGMP report messages.
The basic steps to configure IP multicast routing
Step 1: Enable ip multicast routing
SW(config)# ip multicast-routing
Step 2: Enable PIM on an Interface
SW(config-if)# ip pim sparse-mode
or
SW(config-if)# ip pim dense-mode
Step 3: Configuring RP
If you configure PIM to operate in sparse mode, you must also choose one or more routers to be rendezvous points (RPs). You need not configure the routers to be RPs; they learn how to become RPs themselves.
There are types RPs: non auto and auto
Configure a non-auto RP
ip pim rp-address rp-address
Configure a auto RP:
announcing the RP and the group range it serves:
ip pim send-rp-announce type number scope ttl-value [group-list access-list] [interval seconds]
assigning the RP mapping agent:
ip pim send-rp-discovery scope ttl-value
Note:
If you configure PIM in sparse mode or sparse-dense mode and do not configure Auto-RP, you must statically configure an non-auto RP
Sometimes:
Use the ip pim autorp listener command with interfaces configured for PIM sparse mode operation in order to establish a network configuration where Auto-RP operates in PIM dense mode and multicast traffic can operate in sparse mode, bidirectional mode, or source specific multicast (SSM) mode
Examples
The following example enables IP multicast
routing and the Auto-RP listener feature on a router. It also configures
the router as a Candidate RP for the multicast groups 239.254.2.0
through 239.254.2.255.
ip multicast-routing
ip pim autorp listener
ip pim send-rp-announce Loopback0 scope 16 group-list 1
ip pim send-rp-discovery Loopback1 scope 16
access-list 1 permit 239.254.2.0 0.0.0.255
IP is particularly suited for multimedia applications that involve multiple participants. Issue the following show commands from the CLI to verify multicast configurations on your devices:
Switch# show ip pim rp
Switch# show ip mroute
Switch# show ip mroute
Configuring IP Multicast Routing: www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfmulti.html#wp1000948
http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult2.html#wp1090395
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