HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 579

ProCurve# show ip mroute
IP Multicast Routing Table
Flags:
bit Set,
F - Register, R - RP-bit Set
Timers: Uptime/Expires
(*, G) entry
(*, 239.255.255.1), 01:06:23/00:00:00, RP 10.1.1.1, Flags: SCJ
Source:
Wildcard
source
(S, G) entry
(192.168.100.2, 239.255.255.1), 00:12:10/00:03:30, Flags: ST
Figure 11-19. First Line of a Multicast Routing Table Entry
The router matches the source and destination of an incoming multicast
packet's IP header to the source and destination listed in an entry. The
destination is the multicast group address. A (*, G) entry includes a wildcard
source (*) and matches any source address. The router looks for the most
specific match, so it always matches a multicast to the (S, G) entry if such an
entry exists for its source.
The entry uptime indicates the time since the entry was created. The (*, G)
entry in Figure 11-19 has been active for more than an hour.
The expire timer indicates the number of hours, minutes, and seconds left
before the entry will be deleted. The router resets this timer every time an
interface receives a new join for the group. Routers should send periodic join/
prune messages at intervals of about one third the expire timer so that the
entry is not constantly deleted and recreated.
In a (*, G) entry, the RP address indicates the device toward which the router
should forward its join.
An entry can have more than on flag set at a time. Table 11-4 shows flag settings
for some typical multicast routing table entries.
S - Sparse, C - Connected, P - Pruned, J - Join SPT, T - SPT-
Entry
Destination:
Multicast
group
Source:
Specific
source
Configuring Multicast Support with PIM-SM
Expire
uptime timer
Troubleshooting PIM-SM
RP address Flags
11-51