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Cuda 12000 IP Access Switch CLI-based Administration Guide
About IP Multicast 355
If IGMP proxy is enabled for these multicast groups, the Cuda 12000 joins
these groups on the proxy interface. When the remote multicast router sends
an IGMP query to the Cuda 12000, the Cuda 12000 replies with IGMP
reports for all multicast groups joined by the hosts. Since the remote
multicast router knows about the additional multicast groups joined by the
hosts, it routes multicast traffic for these groups onto the common Ethernet.
When the Cuda 12000 receives this multicast traffic, it forwards the traffic
out to all other interfaces that have joined the same multicast group. In the
figure, if the remote multicast router receives a packet addressed to
224.17.1.5, it transmits the packet to the common Ethernet. The Cuda
12000 then receives the packet and forwards it to interface 1/2/1 and 1/5/3.
PC3 and PC2 receive the multicast packet.
Figure 17-1 Sample Network
1 x 4 CMTS
1 x 4 CMTS
1 x 4 CMTS
1 x 4 CMTS
Octal 10/100 Ethernet
OC-3 POS
OC-12 POS
1 x 4 CMTS
1 x 4 CMTS
1 x 4 CMTS
1 x 4 CMTS
Gigabit Ethernet
POWER
MOUSE MOUSE
KEYBOARD KEYBOARD
COM1 COM1
COM2 COM2
10/100 ENET 10/100 ENET
VIDEO VIDEO
STATUS DISPLAY
FAULT
POWER
STATUS DISPLAY
STATUS DISPLAY
STATUS DISPLAY
ACTIVE LINK
ACTIVE LINK
FAULT
!
Read manual
before
actuating
button
PC4
PC2
PC1
PC3
Remote
Multicast
Router
Ethernet 1
Proxy:
255.1.1.1
224.17.1.5
224.11.12.1
226.1.2.3
Join: 255.1.1.1
Join:
255.1.1.1
224.17.1.5
Join:
224.11.12.1
Join:
226.1.2.3
224.17.1.5
Cable Modem
Cuda 12000
Interface 1/2/1
Interface 1/5/3