Multicast Features; Enabling Ip Multicast; Implementation Information - Dell Z9500 Configuration Manual

Z-series core and aggregation switche

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Multicast routing is supported on secondary IP addresses; it is not supported on IPv6.

Multicast routing is supported across default and non-default virtual routing and forwarding (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)

First Packet Forwarding for Lossless Multicast

Multicast Policies

Enabling IP Multicast

Before enabling any multicast protocols, you must enable IP multicast routing. To enable multicast routing, use the following

Enable multicast routing.

CONFIGURATION mode

ip multicast-routing

Implementation Information

Because protocol control traffic in the Dell Networking OS is redirected using the MAC address, and multicast control traffic

and multicast data traffic might map to the same MAC address, the Dell Networking OS might forward data traffic with certain

MAC addresses to the CPU in addition to control traffic.

As the upper five bits of an IP Multicast address are dropped in the translation, 32 different multicast group IDs map to the same

Ethernet address. For example, 224.0.0.5 is a known IP address for open shortest path first (OSPF) that maps to the multicast

MAC address 01:00:5e:00:00:05. However, 225.0.0.5, 226.0.0.5, and so on, map to the same multicast MAC address. The Layer

2 forwarding information base (FIB) alone cannot differentiate multicast control traffic and multicast data traffic with the same

address, so if you use IP address 225.0.0.5 for data traffic, both the multicast data and OSPF control traffic match the same

entry and are forwarded to the CPU. Therefore, do not use well-known protocol multicast addresses for data transmission,

such as the following:

Ethernet Address

01:00:5e:00:00:05

01:00:5e:00:00:06

01:00:5e:00:00:09

Multicast Features