Multicast Features; Enabling Ip Multicast; Multicast With Ecmp - Dell Z9000 Configuration Manual

Multicast Features

Multicast features are supported on the Z9000 platform.
NOTE: Multicast is supported on secondary IP addresses on the platform.
NOTE: Multicast routing for IPv6 is not supported.
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)

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.
Multicast Features
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