Information Technology Reference
In-Depth Information
Example 11-2 shows the state for the (S,G) on Receiver 1's upstream. The traffic is
forwarded out Ethernet0/0 to the receiver.
Example 11-2
Operational MDT for Group 224.1.1.1
R7#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), 00:05:35/stopped, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
Serial2/0, Forward/Dense, 00:05:35/00:00:00
Ethernet0/0, Forward/Dense, 00:05:35/00:00:00
(10.5.1.5, 224.1.1.1), 00:02:51/00:02:44, flags: T
Incoming interface: Serial2/0, RPF nbr 10.2.1.25
Outgoing interface list:
Ethernet0/0, Forward/Dense, 00:02:51/00:00:00
In Example 11-2, the source has come online, and the traffic has been flooded. The updated
state information shows the (S,G) entry as well as the (*,G) entry. The incoming interface
for the (S,G) is Serial2/0. The (*,G) entry is not used to forward multicast traffic when PIM
operates in dense mode. The incoming interface for the (*,G) is always Null.
Example 11-3 shows the state for the (S,G) on Receiver 2's upstream. The state exists, but
the OIL is empty. This indicates that traffic for this (S,G) has been flooded to this router,
but there is no local receiver. Nor is there a downstream receiver from this router.
Example 11-3
Multicast State Maintained After Pruning
R6#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