Configuring Pim-Dm - 3Com Switch 7700 Configuration Manual

212 C 6: M
HAPTER ULTICAST

Configuring PIM-DM

P
ROTOCOL
Figure 7 Assert Mechanism Diagram
Multicast packets forwarded
by the upstream node
Router A
When they detect such a case, routers need to select a unique sender by using
the assert mechanism. Routers send Assert packets to select the best path. If
two or more have the same priority and metric, the path with a higher IP
address will be the upstream neighbor of the (S, G) entry. This is responsible for
forwarding the (S, G) multicast packet.
Graft
■
When the pruned downstream node needs to be restored to the forwarding
state, the node will send a graft packet to inform the upstream node.
Configuring PIM-DM is described in the following sections:
Configuring PIM-DM
■
PIM-DM Configuration Example
■
Basic PIM-DM configuration includes:
Enabling Multicast
■
Enabling PIM-DM
■
Entering PIM View
■
Advanced PIM-DM configuration includes:
Configuring the Interface Hello Message Interval
■
Configuring the Filtering of Multicast Source/Group
■
Configuring the Filtering of PIM Neighbors
■
Configuring the Maximum Number of PIM Neighbor on an Interface
■
Displaying and Debugging PIM-DM
■
When the router is run in the PIM-DM domain, it is best to enable PIM-DM on all
interfaces of the non-border router.
Enabling Multicast
See "Configuring Common Multicast " on page 196.
Enabling PIM-DM
PIM-DM needs to be enabled in the configuration of all interfaces.
Receiver
Router C
Router B