Administrator Guide

Table Of Contents
Multicast Features
Multicast features are supported on Dell Networking OS.
NOTE: Multicast is supported on secondary IP addresses on the platform.
NOTE: Multicast routing for IPv6 is not supported.
NOTE: Multicast routing is supported across default and non-default VRFs.
The Dell Networking Operating System (OS) supports the following multicast protocols:
PIM Sparse-Mode (PIM-SM)
Internet Group Management Protocol (IGMP)
Multicast Source Discovery Protocol (MSDP)
Topics:
Enabling IP Multicast
Multicast with ECMP
Implementation Information
First Packet Forwarding for Lossless Multicast
Multicast Policies
Enabling IP Multicast
Enable IP multicast is supported on the Z9000S6000 platform.
Prior to enabling any multicast protocols, you must enable multicast routing.
Enable multicast routing.
CONFIGURATION mode
ip multicast-routing
Multicast with ECMP
Dell Networking multicast uses equal-cost multi-path (ECMP) routing to load-balance multiple streams across equal cost links.
When creating the shared-tree protocol independent multicast (PIM) uses routes from all configured routing protocols to select
the best route to the rendezvous point (RP). If there are multiple, equal-cost paths, the PIM selects the route with the least
number of currently running multicast streams. If multiple routes have the same number of streams, PIM selects the first
equal-cost route the route table manager (RTM) returns.
In the following illustration, the receiver joins three groups. The last-hop DR initially has two equal-cost routes to the RP with no
streams, so it non-deterministically selects Route 1 for the Group 1 IGMP Join message. Route 1 then has one stream associated
with it, so the last-hop DR sends the Group 2 Join by Route 2. It then non-deterministically selects Route 2 for the Group 3 Join
because both routes already have one multicast stream.
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