654 CHAPTER 47: PIM CONFIGURATION
■ Prune delay (global value/interface level value)
■ Prune override interval (global value/interface level value)
■ Hello interval (global value/interface level value)
■ Maximum delay between hello message (interface level value)
■ Assert timeout time (global value/interface value)
■ Join/prune interval (global value/interface level value)
■ Join/prune timeout (global value/interface value)
■ Multicast source lifetime
■ Maximum size of join/prune messages
■ Maximum number of (S, G) entries in a join/prune message
Configuring a PIM Filter No matter in a PIM-DM domain or a PIM-SM domain, routers can check
passing-by multicast data based on the configured filtering rules and determine
whether to continue forwarding the multicast data. In other words, PIM routers
can act as multicast data filters. These filters can help implement traffic control on
one hand, and control the information available to receivers downstream to
enhance data security on the other hand.
Follow these steps to configure a PIM filter:
n
■ Generally, a smaller distance from the filter to the multicast source results in a
more remarkable filtering effect.
■ This filter works not only on independent multicast data but also on multicast
data encapsulated in register messages.
Configuring PIM Hello
Options
No matter in a PIM-DM domain or a PIM-SM domain, the hello messages sent
among routers contain many configurable options, including:
■ DR_Priority (for PIM-SM only): priority for DR election. The device with the
highest priority wins the DR election. You can configure this parameter on all
the routers in a multi-access network directly connected to multicast sources or
receivers.
■ Holdtime: the timeout time of PIM neighbor reachability state. When this timer
times out, if the router has received no hello message from a neighbor, it
assumes that this neighbor has expired or become unreachable. You can
configure this parameter on all routers in the PIM domain. If you configure
different values for this timer on different neighboring routers, the largest value
will take effect.
■ LAN_Prune_Delay: the delay of prune messages on a multi-access network.
This option consists of LAN-delay (namely, prune delay), override-interval, and
To do… Use the command… Remarks
Enter system view system-view -
Enter PIM view pim -
Configure a multicast group
filter
source-policy acl-number Required
No multicast data filter by
default
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