DES-3326S Layer 3 Fast Ethernet Switch User’s Guide
112 Switch Management and Operating Concepts
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 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
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