Zte ZXR10 ZSR V2 Series Product Description page 18

ZXR10 ZSR V2 Series Router Product Description
3.1.2.3 PIM-DM
PIM-DM (PIM-Dense-mode) is a dense-mode multicast route protocol and sends
multicast data in the 'push' mode. It usually applies to small network with dense multicast
group members.
3.1.2.4 PIM-SSM
PIM-SSM has all the advantages of PIM-SM, but it can create a source-based shortest
path tree rather than a shared tree. When a group membership report from a particular
source to group is received, the shortest path tree is created directly.
PIM-SSM, a subset of PIM-SM, is suitable for the 'well known' source and is valid between
domains and within a domain. PIM-SM uses the MSDP multicasting inter-domain route,
but PIM-SSM does not.
3.1.2.5 Static Multicast
Static route multicast is used when a multicast is expected to be forwarded via the
specified path rather than the best path of unicast route.
Static multicast provides egress and ingress interfaces for the user to configure multicast
route table and form multicast forwarding table according to the configuration. If static
multicast route and dynamic multicast route are available at the same time, static
multicast route is preferred. Static multicast has the logic status equivalent to PIM-SM and
PIM-DM, namely, a special multicast route protocol. Static route multicast has the
following purposes:

Change RPF route: The multicast and unicast generally have the same network
topology structure and data transport path. Multicast static route can be configured to
change the RPF route so as to create a different transport path for multicast data.

Connect RPF route: When a unicast route is blocked, multicast data cannot be
forwarded because a RPF route is unavailable. Multicast static route can be
configured to generate a RPF route so that multicast route table can be created to
guide the forwarding of multicast data.
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