Pim Sparse-Mode (Pim-Sm); Implementation Information; Protocol Overview - Dell Force10 S4810P Configuration Manual

High-density, 1ru 48-port 10gbe switch

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PIM Sparse-Mode (PIM-SM)

PIM-Sparse Mode (PIM-SM) is a multicast protocol that forwards multicast traffic to a subnet only upon

request using a PIM Join message; this behavior is the opposite of PIM-Dense Mode, which forwards

multicast traffic to all subnets until a request to stop.

The Dell Force10 implementation of PIM-SM is based on the IETF Internet Draft

draft-ietf-pim-sm-v2-new-05.

C-Series supports a maximum of 31 PIM interfaces and 4K multicast entries including (*,G), and

(S,G) entries. There is no limit on the number of PIM neighbors C-Series can have.

S-Series supports a maximum of 31 PIM interfaces and 2K multicast entries including (*,G), and (S,G)

entries. There is no limit on the number of PIM neighbors S-Series can have.

E-Series supports a maximum of 511 PIM interfaces and 50K multicast entries including (*,G), (S,G),

and (S,G,rpt) entries. There is no limit on the number of PIM neighbors E-Series can have.

The SPT-Threshold is zero, which means that the last-hop designated router (DR) joins the shortest

path tree (SPT) to the source upon receiving the first multicast packet.

FTOS reduces the number of control messages sent between multicast routers by bundling Join and

Prune requests in the same message.

FTOS supports PIM-SM on physical, VLAN, and port-channel interfaces.

FTOS supports 2000 IPv6 multicast forwarding entries, with up to 128 PIM-SSM neighbors/interfaces.

PIM-SM on VLAN interfaces is supported on the E-Series on TeraScale platforms only.

IPv6 Multicast is not supported on SONET interfaces.

PIM-SM initially uses unidirectional shared trees to forward multicast traffic; that is, all multicast traffic

must flow only from the Rendezvous Point (RP) to the receivers. Once a receiver receives traffic from the

RP, PM-SM switches to shortest path trees (SPT) to forward multicast traf f ic. Every multicast group has an

RP and a unidirectional shared tree (group-specific shared tree).

is supported on platforms:

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