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Networks that have remote sites connected in a hub and spoke
arrangement over lower speed links can benefit by configuring the
spoke routers as stub networks (see Figure 9-5). If PIM-Dense or
Sparse-Dense mode is configured on the main campus network, then
without additional configuration, multicast traffic would
periodically be flooded to the stub network. PIM-Dense mode can also
flood multicast traffic on links where a PIM neighbor has been
discovered. To prevent this periodic flooding of traffic, the PIM
neighbor relationship must be prevented and an IGMP proxy needs to
be configured. If PIM-Sparse mode is being employed on the campus, a
stub network would not need to know RP-group mappings. |
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