Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 50)

26 Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide
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MPLS Point-to-Multipoint Traffic Engineering
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• Maximum number of branches per P2MP LSP — There is no limit on number of branches per
P2MP LSP. However, considering the linear behavior as detailed in RFC 4461 about number of
egress points and branch LSRs, the standard recommendation is 64 branches per P2MP.
• Maximum number of LSPs and XCs — On the Brocade NetIron CER device, the maximum
number of LSPs are 512 with 4000 S2Ls. On the Brocade NetIron CES device, the maximum
number of LSPs are 128 with 1000 S2Ls.
Benefits of P2MP
The benefits of P2MP feature are:
• Efficiently uses the bandwidth in the network
• Improves the overall capacity of the network
• Efficiently transports broadcast, multicast, and unknown unicast packets
P2MP LSP Traffic-Engineering (TE) Constraints
P2MP LSPs can be configured with various TE constraints to control the path that it should take.
The following TE constraints are applicable to P2MP LSP:
• Bandwidth
• Priority
• Least-fill/most-fill/random tie-breaking when there are ECMP path for the LSP available
• Administrative groups
• Explicit path (user-configured) with strict/loose hops, and so on.
Use case scenario: Transit LSR application for one-to-many applications
Brocade MLX Series routers can be deployed as core transit routers for customers with multiple
vendor devices that act as PE devices. In such a deployment scenario, when P2MP LSP
applications are deployed, the Brocade MLX Series routers behave as transit and/or branch routers
for the P2MP LSP network. Applications such as content distribution, financial services, video
distribution, IP multicast distribution, IPTV, and others, use P2MP topologies for efficient data
traffic routing. Customers who deploy these services can expect Brocade MLX Series transit routers
to support P2MP branch functionality which efficiently replicates the incoming data to egress
nodes.
The following deployment scenario indicates Brocade MLX Series routers in the core of the network
with other vendor devices at the edge (PE) acting as ingress, egress, and bud nodes. In
Figure 11 ,
PE1 is the ingress node for the P2MP LSP while PE2, PE3, and PE4 are egress nodes.
FIGURE 11 Brocade MLX Series router in transit LSR application