D-Link DES-3326S manual Internet Group Management Protocol Igmp, 112

DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

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

Mobile Agents

DHCP Servers and Relay Agents All PIM Routers

RSVP Encapsulation

All CBT Routers

Designated Sbm

All Sbms

VRRP

Unassigned

DVMRP on MOSPF

Table 5-13. 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

112 Switch Management and Operating Concepts