Hi,
we are deploying new Cisco 6807-XL to replace some old 6500 chassis and we run a network with several multicast services in it. We've been doing some initial testing and we noticed a difference in the output of "show ip mroute" in an environment with PIM SSM model when there are no subscribers for a certain multicast group.
here is the output of our old 6500 with 12.2(33)SXJ:
6500#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
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
(A.B.C.D, 234.13.13.12), 02:10:39/00:02:55, flags: sPT
Incoming interface: GigabitEthernet9/42, RPF nbr 0.0.0.0, RPF-MFD
Outgoing interface list: Null
(*, 224.0.1.40), 7w0d/00:02:02, RP 0.0.0.0, flags: DPL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list: Null
And this is the output for the new one, with 15.1(2)SY5:
6807#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
(*, 224.0.1.40), 00:00:05/00:02:54, RP 0.0.0.0, flags: DCL
Incoming interface: Null, RPF nbr 0.0.0.0
Outgoing interface list:
GigabitEthernet7/2, Forward/Sparse, 00:00:05/00:02:54
As you can see, in the output from 15.1(2)SY5, we cannot see the (S,G) entry if there are no subscribers (once you subscribe to the multicast, the route appears normally). In the 12.2(33)SXJ version you could see it, which is very useful to see if we are receiving the multicast in a certain port.
Is this normal in 15.1(2)? Is it removed from the list because the OIL is null? If so, is there any way to enable those routes without OIL to show?
Also, we noticed that in the interface counters, even if we are receiving multicast traffic, it's not identified as such, but as broadcast instead:
Received 56055232 broadcasts (52 IP multicasts)
Is there any reason for this?
Thank you!
