Users Guide

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
All Dell EMC PowerSwitches except MX-Series:
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.
For example, the member port ethernet1/1/36, is listed under both the wildcard source (--) and the source (15.1.1.1) in the
following show command output.
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
Important notes
● OS10 supports IGMP and IPv4 PIM for multicast routing. This release of OS10 does not support IPv6 PIM.
● OS10 supports PIM and IGMP on default and non-default VRFs.
● OS10 does not support multicast routing on S3048-ON platforms.
● Multicast flood control is not supported on S4248FB-ON and S4248FBL-ON platforms.
● OS10 supports MLD snooping for L2 IPv6 multicast.
OS10 does not support the following:
● Fast leave support with a prefix list
● IGMPv2 SSM mapping
● Static multicast group configuration
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