Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 499
Important Points to Remember, Con PIM-SM, Related Configuration Tasks
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source, including the RP, create an (S,G) entry and list the interface on which the message was received as an outgoing interface, thus recreating a SPT to the source. 3. Once the RP starts receiving multicast traffic via the (S,G) it unicasts a Register-Stop message to the first-hop DR so that multicast packets are no longer encapsulated in PIM Register packets and unicast. Upon receiving the first multicast packet from a particular source, the last-hop DR sends a PIM Join message to the source to create an SPT to it. 4. There are two paths, then, between the receiver and the source, a direct SPT and an RPT. One router will receive a multicast packet on two interfaces from the same source in this case; this router prunes the shared tree by sending a PIM Prune message to the RP that tells all routers between the source and the RP to remove the outgoing interface from the (*,G) entry, and tells the RP to prune its SPT to the source with a Prune message. FTOS Behavior: When the router creates an SPT to the source, there are then two paths between the receiver and the source, the SPT and the RPT. Until the router can prune itself from the RPT, the receiver receives duplicate multicast packets which may cause disruption. Therefore, the router must prune itself from the RPT as soon as possible. FTOS optimizes the shared to shortest-path tree switchover latency by copying and forwarding the first (S,G) packet received on the SPT to the PIM task immediately upon arrival. The arrival of the (S,G) packet confirms for PIM that the SPT is created, and that it can prune itself from the shared tree. Important Points to Remember • If a loopback interface with a /32 mask is used as the RP, you must enable PIM Sparse-mode on the interface. Configure PIM-SM Configuring PIM-SM is a two-step process: 1. Enable multicast routing using the command ip multicast-routing from CONFIGURATION mode. 2. Select a Rendezvous Point. 3. Enable PIM-SM on an interface. See page 500. Related Configuration Tasks • Configurable S,G Expiry Timers on page 501 • Configure a Static Rendezvous Point on page 502 • Configure a Designated Router on page 503 • Create Multicast Boundaries and Domains on page 504 PIM Sparse-Mode | 499
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