Multicast Features; Enabling Ip Multicast; Implementation Information - Dell S4048–ON Configuration Manual

S-series 10gbe switches

Hide thumbs Also See for S4048–ON:

Table of Contents

Multicast Features

Dell Networking OS supports the following multicast protocols:

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

NOTE: Multicast routing is supported across default and non-default VRFs.

PIM Sparse-Mode (PIM-SM)

Internet Group Management Protocol (IGMP)

Multicast Source Discovery Protocol (MSDP)

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

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 5 bits of an IP Multicast address are dropped in the translation, 32 different multicast group IDs all 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

Ethernet Address

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

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

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

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

01:00:5e:00:00:12

01:00:5e:00:00:0d

Multicast Features