DELL N3000 User Manual
Managing IPv4 and IPv6 Multicast
1339
What Multicast Protocols Does the Switch Support?
Multicast protocols are used to deliver multicast packets from one source to
multiple receivers. Table 43-1 summarizes the multicast protocols that the
switch supports.
What Are the Multicast Protocol Roles?
Hosts must have a way to identify their interest in joining any particular
multicast group, and routers must have a way to collect and maintain group
memberships. These functions are handled by the IGMP protocol in IPv4. In
IPv6, multicast routers use the Multicast Listener Discover (MLD) protocol
to maintain group membership information.
Multicast routers must also be able to construct a multicast distribution tree
Multicast routers must also be able to construct a multicast distribution tree
that enables forwarding multicast datagrams only on the links that are
required to reach a destination group member. Protocols such as DVMRP, and
PIM handle this function.
IGMP and MLD are multicast group discovery protocols that are used
IGMP and MLD are multicast group discovery protocols that are used
between the clients and the local multicast router. PIM-SM, PIM-DM, and
DVMRP are multicast routing protocols that are used across different
subnets, usually between the local multicast router and remote multicast
router.
Table 43-1. Multicast Protocol Support Summary
Protocol
IPv4 or IPv6
For Communication Between
IGMP
IPv4
Host-to-L3 switch/router
IGMP Proxy
IPv4
Host-to-L3 switch/router
MLD
IPv6
Host-to-L3 switch/router
MLD Proxy
IPv6
Host-to-L3 switch/router
PIM-SM
IPv4 and IPv6
L3-switch/router-to-L3 switch/router
PIM-DM
IPv4 and IPv6
L3-switch/router-to-L3 switch/router
DVMRP
IPv4
L3-switch/router-to-L3 switch/router