D-Link DES-3326SRM Product Manual - Page 213

Multicasting, Multicast Groups, Reserved Multicast Address Assignment, Address, Assignment

Page 213 highlights

Multicasting D-Link DES-3326S Layer 3 Switch Multicasting is a group of protocols and tools that enable a single source point to send packets to groups of multiple destination points with persistent connections that last for some amount of time. The main advantage to multicasting is a decrease in the network load compared to broadcasting. Multicast Groups Class D IP addresses are assigned to a group of network devices that comprise a multicast group. The four most significant four bits of a Class D address are set to "1110". The following 28 bits is referred to as the 'multicast group ID'. Some of the range of Class D addresses are registered with the Internet Assigned Numbers Authority (IANA) for special purposes. For example, the block of multicast addresses ranging from 224.0.0.1 to 224.0.0.225 is reserved for use by routing protocols and some other low-level topology discovery and maintenance protocols. Some of the reserved IP multicast addresses are as follows: Reserved Multicast Address Assignment Address 224.0.0.0 224.0.0.1 224.0.0.2 224.0.0.3 224.0.0.4 224.0.0.5 224.0.0.6 224.0.0.7 224.0.0.8 224.0.0.9 224.0.0.10 224.0.0.11 224.0.0.12 224.0.0.13 224.0.0.14 224.0.0.15 224.0.0.16 224.0.0.17 224.0.0.18 224.0.0.19 through 224.0.0.225 224.0.0.21 Assignment Base Address (reserved) All Systems on this subnet All Routers on this subnet Unassigned DVMRP Routers OSPF IGP Routers OSPF IGP Designated Routers ST Routers ST Hosts All RIP2 Routers All IGRP Routers Mobile Agents DHCP Servers and Relay Agents All PIM Routers RSVP Encapsulation All CBT Routers Designated Sbm All Sbms VRRP Unassigned DVMRP on MOSPF 203

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D-Link DES-3326S Layer 3 Switch
Multicasting
Multicasting is a group of protocols and tools that enable a single source point to send packets to groups of multiple
destination points with persistent connections that last for some amount of time. The main advantage to multicasting is a
decrease in the network load compared to broadcasting.
Multicast Groups
Class D IP addresses are assigned to a group of network devices that comprise a multicast group.
The four most
significant four bits of a Class D address are set to “1110”. The following 28 bits is referred to as the ‘multicast group ID’.
Some of the range of Class D addresses are registered with the Internet Assigned Numbers Authority (IANA) for special
purposes.
For example, the block of multicast addresses ranging from 224.0.0.1 to 224.0.0.225 is reserved for use by routing
protocols and some other low-level topology discovery and maintenance protocols.
Some of the reserved IP multicast addresses are as follows:
Reserved Multicast Address Assignment
Address
Assignment
224.0.0.0
Base Address (reserved)
224.0.0.1
All Systems on this subnet
224.0.0.2
All Routers on this subnet
224.0.0.3
Unassigned
224.0.0.4
DVMRP Routers
224.0.0.5
OSPF IGP Routers
224.0.0.6
OSPF IGP Designated Routers
224.0.0.7
ST Routers
224.0.0.8
ST Hosts
224.0.0.9
All RIP2 Routers
224.0.0.10
All IGRP Routers
224.0.0.11
Mobile Agents
224.0.0.12
DHCP Servers and Relay Agents
224.0.0.13
All PIM Routers
224.0.0.14
RSVP Encapsulation
224.0.0.15
All CBT Routers
224.0.0.16
Designated Sbm
224.0.0.17
All Sbms
224.0.0.18
VRRP
224.0.0.19
through
224.0.0.225
Unassigned
224.0.0.21
DVMRP on MOSPF
203