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Configuring PIM Dense Mode Properties

In PIM dense mode (PIM-DM), the assumption is that almost all possible subnets have at least one receiver wanting to receive the multicast traffic from a source, so the network is flooded with traffic on all possible branches, then pruned back when branches do not express an interest in receiving the packets, explicitly (by message) or implicitly (time-out silence). LANs are appropriate networks for dense-mode operation.

By default, PIM is disabled. When you enable PIM, it operates in sparse mode by default.

You can configure PIM dense mode globally or for a routing instance. This example shows how to configure the routing instance and how to specify that PIM dense mode use inet.2 as its RPF routing table instead of inet.0.

To configure the router properties for PIM dense mode:

  1. (Optional) Create an IPv4 routing table group so that interface routes are installed into two routing tables, inet.0 and inet.2.
    [edit routing-options rib-groups]user@host# set pim-rg export-rib inet.0user@host# set pim-rg import-rib [ inet.0 inet.2 ]
  2. (Optional) Associate the routing table group with a PIM routing instance.
    [edit routing-instances PIM.dense protocols pim]user@host# set rib-group inet pim-rg
  3. Configure the PIM interface. If you do not specify any interfaces, PIM is enabled on all router interfaces. Generally, you specify interface names only if you are disabling PIM on certain interfaces.
    [edit routing-instances PIM.dense protocols pim]user@host# set interface fe-0/0/1.0 mode dense

    Note: You cannot configure both PIM and Distance Vector Multicast Routing Protocol (DVMRP) in forwarding mode on the same interface. You can configure PIM on the same interface only if you configured DVMRP in unicast-routing mode.

  4. Monitor the operation of PIM dense mode by running the show pim interfaces, show pim join, show pim neighbors, and show pim statistics commands.
 

Related Documentation

 

Published: 2012-06-27

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