Dell S3048-ON User Manual

Multicast Features
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 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)
Topics:
• Enabling IP Multicast
• Implementation Information
• Multicast Policies
• Understanding Multicast Traceroute (mtrace)
• Printing Multicast Traceroute (mtrace) Paths
• Supported Error Codes
• mtrace Scenarios
Enabling IP Multicast
Before enabling any multicast protocols, you must enable IP multicast routing. To enable multicast routing, use the following command.
• Enable multicast routing.
CONFIGURATION mode
ip multicast-routing
Implementation Information
Because protocol control trac in the Dell Networking OS is redirected using the MAC address, and multicast control trac and multicast
data trac might map to the same MAC address, the Dell Networking OS might forward data trac with certain MAC addresses to the
CPU in addition to control trac.
As the upper ve bits of an IP Multicast address are dropped in the translation, 32 dierent multicast group IDs map to the same Ethernet
address. For example, 224.0.0.5 is a known IP address for open shortest path rst (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 dierentiate multicast control trac and multicast data trac with the same address, so if you use IP address
225.0.0.5 for data trac, both the multicast data and OSPF control trac 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:
Protocol
Ethernet Address
OSPF
01:00:5e:00:00:05
30
Multicast Features 511

Dell S3048-ON Specifications

General

Brand	Dell
Model	S3048-ON
Category	Switch
Language	English