Fortinet MR1 - Manual (Page 413)

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Subnet Mask: This field indicates the Subnet Mask of this PIM-SM interface.
Designated Router: This indicates the IP Address of the Designated Router for this interface.
Neighbor Count: This field displays the number of neighbors on the PIM-SM interface.
7.5.1.5 show ip pimsm neighbor
This command displays the neighbor information for PIM-SM on the specified interface.
Syntax
show ip pimsm neighbor [<slot/port> | all]
< slot/port > - Interface number.
all - this command represents all interfaces.
Default Setting
None
Command Mode
Privileged Exec
Display Message
Interface: Valid slot and port number separated by a forward slash.
IP Address: This field displays the IP Address of the neighbor on an interface.
Up Time: This field indicates the time since this neighbor has become active on this interface.
Expiry Time: This field indicates the expiry time of the neighbor on this interface.
7.5.1.6 show ip pimsm rp
This command displays the PIM information for candidate Rendezvous Points (RPs) for all IP
multicast groups or for the specific <group-address> <group-mask> provided in the
command. The information in the table is displayed for each IP multicast group.
Syntax
show ip pimsm rp {<group-address> <group-mask> | candidate | all}
< group-address > - the IP multicast group address.