HP 3500YL User Manual
Page 111
PIM-SM (Sparse Mode)
Terminology
C-RP:
See Candidate Rendezvous Point, above.
Designated Router (DR):
Within a given VLAN or network, the router
elected to forward a multicast flow from its IP source (in the VLAN or
network) to the appropriate rendezvous point (either an RP or static-RP) in
the PIM-SM domain.
Edge Router:
Any router directly connected to a host or other endpoint in
the network.
Flow:
Multicast traffic having one source and one multicast group address
(destination). This traffic may reach many hosts in different subnets, depend
ing on which hosts have issued joins for the same multicast group.
Multicast Source:
A single device originating multicast traffic for other
devices (receivers).
Prune:
To eliminate branches of a multicast tree that have no hosts sending
joins to request or maintain membership in that particular multicast group.
Rendezvous Point (RP):
A router that is either elected from a pool of
eligible C-RPs (dynamic RPs) or statically configured (static RP) to support
the distribution of traffic for one or more multicast groups and/or ranges of
multicast groups. The RP for a given multicast group receives that group’s
traffic from a DR on the VLAN receiving the traffic from a multicast traffic
source. The RP then forwards the traffic to downstream edge or intermediate
PIM-SM routers in the path(s) to the requesting hosts (end points). (See also
Candidate Rendezvous Point
, page 4-6).
Rendezvous Point Tree (RPT):
The path extending from the DR through
any intermediate PIM-SM routers leading to the PIM-SM edge router(s) for the
multicast receiver(s) requesting the traffic for a particular multicast group.
(Refer to “Rendezvous-Point Tree (RPT)” on page 4-9.)
Reverse Path Forwarding (RPF):
This is a methodology that uses the
unicast routing table created by IP protocols such as RIP and OSPF to
determine the source address of a packet. PIM uses RPF to set up distribution
trees for multicast traffic.
Router:
In the context of this chapter, a router is any ProCurve switch model
covered by this guide and configured with IP routing enabled.
Routing Switch:
See Router, above.
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