Multicast Application In Vpns - HP MSR1002-4 Configuration Manual

Figure 9 VPN networking diagram
VPN B
CE b1
CE a1
VPN A
•
The P device belongs to the public network. The CE devices belong to their respective VPNs.
Each CE device serves its own VPN and maintains only one set of forwarding mechanisms.
•
The PE devices connect to the public network and the VPNs. Each PE device must strictly
distinguish the information for different networks, and maintain a separate forwarding
mechanism for each network. On a PE device, a set of software and hardware that serve the
same network forms an instance. Multiple instances can exist on the same PE device, and an
instance can reside on different PE devices. On a PE device, the instance for the public network
is called the public network instance, and those for VPNs are called VPN instances.

Multicast application in VPNs

A PE device that supports multicast for VPNs performs the following operations:
•
Maintains an independent set of multicast forwarding mechanisms for each VPN, including the
multicast protocols, PIM neighbor information, and multicast routing table. In a VPN, the device
forwards multicast data based on the forwarding table or routing table for that VPN.
•
Implements the isolation between different VPNs.
•
Implements information exchange and data conversion between the public network and VPN
instances.
For example, as shown in
group. Only receivers that belong to both the multicast group and VPN A can receive the multicast
data. The multicast data is multicast both in VPN A and on the public network.
VPN A
CE b2
PE 1
Public network
Figure 9, a multicast source in VPN A sends multicast data to a multicast
CE a2
CE b3
PE 2
P
PE 3
11
VPN B
CE a3
VPN A