Information Technology Reference
In-Depth Information
The multicast state information on the RP indicates that the SPT to the source 10.5.1.5 has
been pruned. The pruning is shown in Example 11-8 where the (S,G) has the P flag set, and
no OIL. The RP must maintain information about this particular source so that other receiv-
ers can join. State is maintained to allow the RP to rebuild the SPT to the source, if needed,
much like grafts in PIM-DM.
Example 11-8
Multicast State Information on the RP Indicates That SPT Has Been Pruned After SPT Switchover
R2#show ip mroute 224.1.1.1
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
L - Local, P - Pruned, R - RP-bit set, F - Register flag,
T - SPT-bit set, J - Join SPT, M - MSDP created entry,
X - Proxy Join Timer Running, A - Candidate MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags: H - Hardware switched
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.1.1.1), 00:04:33/stopped, RP 10.1.1.2, flags: S
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial4/0, Forward/Sparse, 00:04:33/00:02:41
(10.5.1.5, 224.1.1.1), 00:03:33/00:01:34, flags: PT
Incoming interface: Serial2/0, RPF nbr 10.2.1.1
Outgoing interface list: Null
The final MDT is shown in Figure 11-17.
Figure 11-17
Final MDT for the PIM-SM Network
R3
Source
RP
R1
R2
R5
R6
R4
R7
Receiver
