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Option: Configuring VPLS Traffic Flooding over a Point-to-Multipoint LSP

 

In each VPLS routing instance, you can configure a dedicated point-to-multipoint LSP to carry all unknown unicast, broadcast, and multicast traffic. Enabling this feature increases the efficiency of your network, because duplicate copies of flooded traffic do not have to be created for each PE router in the VPLS routing instance. Figure 1 shows how flooded traffic reaches PE routers in a VPLS routing instance when a point-to-multipoint LSP is not configured for flooding. Figure 2 shows an example of a VPLS routing instance configured with point-to-multipoint LSP flooding.

Note

You cannot configure point-to-multipoint LSP flooding if your VPLS network is configured for interoperability between BGP and LDP signaling.

Figure 1: Traditional Flooding in a VPLS Routing Instance
Traditional Flooding in a VPLS Routing
Instance

 

Figure 2: VPLS Routing Instance with Point-to-Multipoint LSP Flooding
VPLS Routing Instance with Point-to-Multipoint
LSP Flooding

 

You have three options when configuring a point-to-multipoint LSP for flooding:

  • Static point-to-multipoint LSP—Configure this option to control which path each PE sub-LSP takes. When using this option, ensure that all PEs within the VPLS routing instance are part of the static point-to-multipoint LSP. When you add PEs to the VPLS routing instance, you must configure a sub-LSP for the new PE and add the sub-LSP to the static point-to-multipoint LSP. To configure a static point-to-multipoint LSP, include the label-switched-path path-name statement at the [edit protocols mpls] hierarchy level.

  • Dynamic point-to-multipoint LSP with a preconfigured template—Configure this option to create a dynamic point-to-multipoint LSP with specific parameters such as link protection and optimized time. With this option, newly added PEs are automatically added to the point-to-multipoint LSP. To use the preconfigured template, include the template statement at the [edit protocols mpls label-switch-path path-name] hierarchy level.

  • Dynamic point-to-multipoint LSP with a default template—Configure this option to automatically create a dynamic point-to-multipoint LSP with default parameters. With this option, newly added PEs are automatically added to the point-to-multipoint LSP. To use a default template, include the default-template statement at the [edit routing-instances routing-instance-name provider-tunnel rsvp-te label-switched-path-template] hierarchy level.

To define the parameters for a static point-to-multipoint LSP, include the label-switched-path path-name statement at the [edit protocols mpls] hierarchy level:

To add a new PE router to the static point-to-multipoint LSP, include the label-switched-path sub-path-name statement at the [edit protocols mpls] hierarchy level:

For more information on configuring static and dynamic point-to-multipoint LSPs, see the Junos MPLS Applications Configuration Guide.

To enable this feature, configure either the static or label-switched-path-template options for the rsvp-te statement at the [edit routing-instance routing-instance-name provider-tunnel] hierarchy level:

To verify your work, enter the show vpls connection extensive command: