D-Link DES-3226SM Product Manual - Page 38

Internet Group Management Protocol IGMP, IGMP Versions 1 and 2

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DES-3226S Layer 2 Fast Ethernet Switch User's Guide Some of the reserved IP multicast addresses are as follows: Address Assignment 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 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 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 224.0.0.13 224.0.0.14 224.0.0.15 224.0.0.16 224.0.0.17 224.0.0.18 224.0.0.19 through 224.0.0.225 224.0.0.21 All PIM Routers RSVP Encapsulation All CBT Routers Designated Sbm All Sbms VRRP Unassigned DVMRP on MOSPF Table 2. Reserved Multicast Address Assignment Internet Group Management Protocol (IGMP) End users that want to receive multicast packets must be able to inform nearby routers that they want to become a multicast group member of the group these packets are being sent to. The Internet Group Management Protocol (IGMP) is used by multicast routers to maintain multicast group membership. IGMP is also used to coordinate between multiple multicast routers that may be present on a network by electing one of the multicast routers as the 'querier'. This router then keep track of the membership of multicast groups that have active members on the network. IGMP is used to determine whether the router should forward multicast packets it receives to the subnetworks it is attached to or not. A multicast router that has received a multicast packet will check to determine if there is at least one member of a multicast group that has requested to receive multicast packets from this source. If there is one member, the packet is forwarded. If there are no members, the packet is dropped. IGMP Versions 1 and 2 Users that want to receive multicast packets need to be able to join and leave multicast groups. This is accomplished using IGMP. Figure 5 - 8. IGMP Message Format 35

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DES-3226S Layer 2 Fast Ethernet Switch User’s Guide
35
Some of the reserved IP multicast addresses are as follows:
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
Table 2.
Reserved Multicast Address Assignment
Internet Group Management Protocol (IGMP)
End users that want to receive multicast packets must be able to inform nearby routers that they want to become a multicast
group member of the group these packets are being sent to.
The Internet Group Management Protocol (IGMP) is used by
multicast routers to maintain multicast group membership.
IGMP is also used to coordinate between multiple multicast routers
that may be present on a network by electing one of the multicast routers as the ‘querier’.
This router then keep track of the
membership of multicast groups that have active members on the network.
IGMP is used to determine whether the router
should forward multicast packets it receives to the subnetworks it is attached to or not.
A multicast router that has received a
multicast packet will check to determine if there is at least one member of a multicast group that has requested to receive
multicast packets from this source.
If there is one member, the packet is forwarded.
If there are no members, the packet is
dropped.
IGMP Versions 1 and 2
Users that want to receive multicast packets need to be able to join and leave multicast groups.
This is accomplished using
IGMP.
Figure 5 - 8. IGMP Message Format