Dvmrp Overview; Igmp Overview; Igmp Snooping; Configuring Ip Multicasting Routing - Extreme Networks BlackDiamond 6800 User Manual

IP M R
ULTICAST OUTING
DVMRP O
VERVIEW
DVMRP is a distance vector protocol that is used to exchange routing and multicast
information between routers. Like RIP, DVMRP periodically sends the entire routing
table to its neighbors.
DVMRP has a mechanism that allows it to prune and graft multicast trees to reduce the
bandwidth consumed by IP multicast traffic.
IGMP O
VERVIEW
IGMP is a protocol used by an IP host to register its IP multicast group membership
with the router. Periodically, the router queries the multicast group to see if the group is
still in use. If the group is still active, a single IP host responds to the query, and group
registration is maintained.
IGMP S
NOOPING
IGMP snooping adds intelligence to a layer 2 device (such as a switch), to reduce the
flooding of IP multicast traffic. The goal of IGMP snooping is to optimize the usage of
network bandwidth and prevent multicast traffic from being flooded to parts of the
network that do not need to see it. In order to reduce the bandwidth used by IP
multicast applications, IGMP snooping is always enabled on the BlackDiamond.
C
ONFIGURING
To configure IP multicast routing, you must do the following:
1 Configure the system for IP unicast routing.
For more information on configuring IP unicast routing, refer to
Chapter 9.
2 Enable multicast routing on the interface, using the following command:
enable ipmcforwarding {vlan <name> | all}
10-2
IP M
ULTICASTING
R
OUTING
Chapter 8 and
B D U G
LACK IAMOND SER UIDE