Configuring Multicast Vpn - HP A6600 Configuration Manual

Configuring multicast VPN

Multicast VPN is a technique that implements multicast delivery in MPLS L3VPN networks. An MPLS
L3VPN is a VPN implemented based on the extension technologies of the BGP and MPLS. It comprises a
set of customer sites that are interconnected only by means of an MPLS provider backbone network. You
can think of the VPN as a set of policies that control the interconnections between these sites.
For more information about MPLS L3VPN, see MPLS Configuration Guide. For more information about
BGP, see Layer 3—IP Routing Configuration Guide.
Figure 59 Typical application of MPLS L3VPNs
VPN B
Site 6
As shown in
and Site 6. A VPN involves the following types of devices:
• P device—Device in the core of the provider backbone network. A P device does not directly connect
to CE devices, but it implements MPLS forwarding.
PE device—Edge device in the provider backbone network. By directly connecting to one or more
•
CE devices, a PE device processes VPN routing as a main MPLS L3VPN implementer.
CE device—Edge device on a customer network. A CE device can be a router, a switch, or a host,
•
that implements route distribution on the customer network.
In an MPLS L3VPN environment, between any two sites that belong to the same VPN, packets are
transmitted labeled across the public network. The PE device at the entrance to the provider backbone
attaches the following labels to the packets:
• Outer label—Used for switching within the backbone. It represents a LSP from the local PE to the
peer PE. With this label, a packet can arrive to the peer PE along the LSP.
VPN A
Site 1
CE 1
P 1
CE 6
PE 3
CE 5
VPN A
Site 5
Figure 59, VPN A comprises Site 1, Site 3 and Site 5, and VPN B comprises Site 2, Site 4
VPN B
Site 2
PE 1
CE 2
CPE
layer
Edge
layer
P 2
Core
layer
PE 2
P 3
CE 4
VPN B
Site 4
212
VPN A
Site 3
CE 3