Dell SmartFabric OS10 User Guide Release 10.5.3

Multicast

Multicast is a technique that allows networking devices to send data to a group of interested receivers in a single transmission. For instance, this technique is widely used for streaming videos. Multicast allows you to more efficiently use network resources, specifically for bandwidth-consuming services such as audio and video transmission.

OS10 supports the multicast feature in IPv4 networks and uses the following protocols for multicast distribution:

• Internet Group Management Protocol (IGMP)—IGMP is a communications protocol that establishes multicast group memberships using IPv4 networks. OS10 supports IGMPv1, IGMPv2, and IGMPv3 to manage the multicast group memberships on IPv4 networks.
• Protocol Independent Multicast (PIM)—PIM is a group of multicast routing protocols that provides one-to-many and many-to-many transmission of information. PIM uses routing information from other routing protocols and does not depend on any specific unicast routing protocol. PIM uses any unicast routing protocol that is deployed in the network.

Configuration notes

When there is an exclude join, the show {ip | ipv6} {igmp | mld} snooping groups detail command lists the member port under both the wild-card (--) source, and sources that are listed in the report. The member port listed under the wild-card (--) source has the expiry timer running and indicates that the multicast data packets that do not match the excluded sources for this member port are forwarded to that port.

OS10# show ip igmp snooping groups detail
Interface vlan10
Group 234.1.1.1
Source List
--
Member Port Mode Uptime
Expires
ethernet1/1/36 Exclude 00:01:33
00:01:59
ethernet1/1/38 Exclude 00:01:33
00:01:54
15.1.1.1
Member Port Mode Uptime
Expires
ethernet1/1/36 Exclude 00:01:33
Never
21.1.1.1
Member Port Mode Uptime
Expires
ethernet1/1/38 Exclude 00:01:33 Never