Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 49)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 25
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MPLS Point-to-Multipoint Traffic Engineering
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Prerequisites and limitations
• P2MP feature supports transit and branch functionality only.
• FPGA-based second generation line cards support P2MP LSP feature. This feature is not
supported by FPGA-based first generation line cards and 24x10g module line cards. In a
network deployment with a router having both first generation and second generation line
cards, the feature provides the following responses to specific scenarios:
• Router receives packets on a first generation port — The control packet is dropped and an
error message (if applicable) is returned to the ingress so that the user can find an
alternative path for the P2MP LSP.
• Router transmits packets on a first generation port — The control packet is dropped and an
error message (if applicable) is returned to the ingress so that the user can find an
alternative path for the P2MP LSP.
• LAG and VE ports with either generation line cards — If a P2MP control message is
received on a LAG or VE, or sent by a LAG or VE, that has at least one member port of
FPGA-based first generation line card, the control message is dropped and/ or an error
message is returned.
• Modifying LAG or VE on the fly — While adding a first generation member port to an existing
LAG or VE port, if the LAG or VE is an incoming or outgoing port for at least one P2MP LSP,
then all associated P2MP LSPs are torn down.
• Each P2MP LSP requires one mapped VLAN ID (MVID) at the transit router. When the system
runs out of MVID resources, a new incoming Path message for P2MP session is rejected and a
Path error message is sent back indicating that the system is out of resource.
• Any P2MP LSPs transiting through the router will no longer come up if there is an image
downgrade.
• The following P2MP features are not supported:
• Ingress features
• Egress features
• Bud node features
• Data traffic load balancing over LAG
• Fast ReRoute (FRR)
• LSP stitching and LSP hierarchy
• Soft preemption
Scalability limitations
• Maximum number of P2MP sessions — The number of P2MP sessions supported at a transit or
branch router is limited by the replication entry resource. There are 2000 replication entries
available on a Brocade MLX Series device. Therefore the maximum number of P2MP sessions
supported is 2000.
• Maximum number of total branches — Each FPGA XPP image supports a maximum of 8000
replications. That is, one incoming packet can be replicated into 8000 copies by one XPP.
Depending on the number of XPPs on a line card, the total number of branches supported will
vary. For example, on a 8x10 module with two network processors, there are a maximum of
16000 branches supported.