Configuration Guide User guide

FastIron Configuration Guide 1531
53-1002494-02
PIM Sparse
Displaying all multicast cache entries in a
pruned state
You can use the show ip pim prune command to display all multicast cache entries that are
currently in a pruned state and have not yet aged out.
Syntax: show ip pim prune
PIM Sparse
Brocade devices support Protocol Independent Multicast (PIM) Sparse version 2. PIM Sparse
provides multicasting that is especially suitable for widely distributed multicast environments. The
Brocade implementation is based on RFC 2362.
In a PIM Sparse network, a PIM Sparse router that is connected to a host that wants to receive
information for a multicast group must explicitly send a join request on behalf of the receiver (host).
PIM Sparse routers are organized into domains. A PIM Sparse domain is a contiguous set of routers
that all implement PIM and are configured to operate within a common boundary. Figure 174
shows a simple example of a PIM Sparse domain. This example shows three Layer 3 switches
configured as PIM Sparse routers. The configuration is described in detail following the figure.
Prune Age The number of packets the device sends using the path through the RP
before switching to using the SPT path.
Prune Wait Interval The amount of time a PIM device waits before stopping traffic to
neighbor devices that do not want the traffic. The value can be from zero
to three seconds. The default is three seconds.
Interface The type of interface and the interface number.
Local Address Indicates the IP address configured on the port or virtual interface.
TTL Threshold The minimum value required in a packet for it to be forwarded out of the
interface.
DR The priority of the designated device.
TABLE 254 Output of the show ip pim dense command
Field Description
router(config)# show ip pim prune
Port SourceNet Group Nbr PhyPort Age
sec
v800 172.10.1.10 239.255.255.250 0.0.0.0 1/1/3 140