MPLS and RSVP
7450 ESS MPLS Guide Page 155
Point-to-Multipoint (P2MP) RSVP LSP
Point-to-multipoint (P2MP) RSVP LSP allows the source of multicast traffic to forward packets to
one or many multicast receivers over a network without requiring a multicast protocol, such as
PIM, to be configured in the network core routers. A P2MP LSP tree is established in the control
plane which path consists of a head-end node, one or many branch nodes, and the leaf nodes.
Packets injected by the head-end node are replicated in the data plane at the branching nodes
before they are delivered to the leaf nodes.
Application in Video Broadcast
Figure 34 illustrates the use of the SR product family in triple play application (TPSDA). The
Broadband Service Router (BSR) is a 7750 SR and the Broadband Service Aggregator (BSA) is
the 7450 ESS.
Figure 34: Application of P2MP LSP in Video Broadcast
A PIM-free core network can be achieved by deploying P2MP LSPs using other core routers. The
router can act as the ingress LER receiving the multicast packets from the multicast source and
forwarding them over the P2MP LSP.
OSSG260
IGMP
Quarter
IP
Core
PIM
P2MP LSP Tree
H-VPLS Spoke
PIM
DHCP
Server
Video
Source
BSABSA
BSR
BSR
BSA BSA
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