Virtual Private Routed Network Services
7750 SR OS Services Guide Page 875
Multicast in IP-VPN Applications
Applications for this feature include enterprise customer implementing a VPRN solution for their
WAN networking needs, customer applications including stock-ticker information, financial
institutions for stock and other types of trading data and in the future, video delivery systems.
Implementation of the draft-rosen-vpn-mcast, Multicast in MPLS/BGP IP VPNs,
entails the
support and separation of the providers core multicast domain from the various customer multicast
domains and the various customer multicast domains from each other.
Figure 4: Multicast in IP-VPN Applications
Figure 55 depicts an example of multicast in an IP-VPN application. The provider’s domain
encompasses the core routers (1 through 4) and the edge routers (5 through 10). The various IP-
VPN customers each have their own multicast domain, VPN-1 (CE routers 12, 13 and 16) and
VPN-2 (CE Routers 11, 14, 15, 17 and 18). Multicast in this VPRN example, the VPN-1 data
generated by the customer behind router 16 will be multicast only by PE 9 to PE routers 6 and 7
for delivery to CE routers 12 and 13 respectively. Data generated for VPN-2 generated by the
customer behind router 15 will be forwarded by PE 8 to PE routers 5, 7 and 10 for delivery to CE
routers 18, 11, 14 and 17 respectively.
OSSG063
VPN 1 Domain
VPN 2 Domain
PRVD Domain
CE VPN 1
CE VPN 2
PE
P
1
1
11
13
17 14
15
1
5
10
9
7
8
6
1
1 2
4 3
12
13
16
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