Hi All,
I was doing a multicast lab to understand more about multicast routing. I have sparse-dense-mode running on all the interfaces.
This is the routing table from one of the devices. Unlike the unicast routing table, this mroute table is bit more tough to understand.
R6#sh ip mroute
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, E - Extranet,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report,
Z - Multicast Tunnel, z - MDT-data group sender,
Y - Joined MDT-data group, y - Sending to MDT-data group,
G - Received BGP C-Mroute, g - Sent BGP C-Mroute,
Q - Received BGP S-A Route, q - Sent BGP S-A Route,
V - RD & Vector, v - Vector
Outgoing interface flags: H - Hardware switched, A - Assert winner
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 239.1.1.1), 00:00:35/stopped, RP 6.6.6.6, flags: SJC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet1/0, Forward/Sparse-Dense, 00:00:35/00:02:40
(16.1.1.1, 239.1.1.1), 00:00:35/00:02:24, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 16.1.1.1
Outgoing interface list:
FastEthernet1/0, Forward/Sparse-Dense, 00:00:35/00:02:40
(*, 239.1.1.2), 00:00:20/stopped, RP 0.0.0.0, flags: DC
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse-Dense, 00:00:20/stopped
FastEthernet1/0, Forward/Sparse-Dense, 00:00:20/stopped
(16.1.1.1, 239.1.1.2), 00:00:13/00:02:46, flags: T
Incoming interface: FastEthernet0/0, RPF nbr 16.1.1.1
Outgoing interface list:
FastEthernet1/0, Forward/Sparse-Dense, 00:00:13/stopped
(*, 224.0.1.40), 00:00:36/00:02:59, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
FastEthernet0/0, Forward/Sparse-Dense, 00:00:36/stopped
FastEthernet1/0, Forward/Sparse-Dense, 00:00:36/stopped
R6#
The multicast IP: 239.1.1.1 is routed in sparse mode with a manual RP & 239.1.1.2 is getting routed in dense mode.
Can anyone please tell me why the route table is showing (*, 239.1.1.1) AND (*, 239.1.1.2). What is the meaning of that? Also what is the time counter in the routing table?
CF
