14 CHAPTER 1: INTRODUCING THE LAYER 3 MODULE
■ Internet Group Management Protocol (IGMP)
■ Distance Vector Multicast Routing Protocol (DVMRP)
■ User Datagram Protocol (UDP) helper (BOOTP/DHCP Relay)
■ Several management options:
■ Web-based management
■ Command line interface management
■ SNMP management
Layer 3 Module
Software Features
Explained
The following sections explain in more detail the software features listed
in “Summary of Software Features” on page 13.
IP v4 Unicast Routing The Layer 3 Module supports IP v4 unicast routing and its associated
features. This allows packets to be routed between individual hosts on
different VLANs.
IP v4 Multicast
Routing
The Layer 3 Module supports IP v4 multicast routing and its associated
protocols. These protocols allow packets to be efficiently routed from a
single host to many other hosts:
■ Distance Vector Multicast Routing Protocol (DVMRP). This supports IP
multicast routing by broadcasting data to each router in an
internetwork when users join or leave multicast groups.
■ Internet Group Management Protocol (IGMP). This is used by IP hosts
to report their multicast group memberships to any adjacent multicast
routers.
Static Routes Both dynamic and static routes are explained in detail in “Dynamic and
Static Routes” on page 16.
UDP Helper UDP Helper permits the routing of UDP broadcast frames between VLANs
when these broadcasts are not normally routed between VLANs. With
UDP Helper, protocols such as the Bootstrap Protocol (BOOTP) and the
Dynamic Host Configuration Protocol (DHCP) are available so that you
can boot hosts through this router.
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