Chapter 51
| Multicast Routing Commands
General Multicast Routing
– 1177 –
Example
This example shows detailed multicast information for a specified group/source
pair
Console#show ip mroute 224.0.255.3 192.111.46.8
IP Multicast Forwarding is enabled.
IP Multicast Routing Table
Flags: D - Dense, S - Sparse, s - SSM Channel, C - Connected, P - Pruned,
F - Register flag, R - RPT-bit set, T - SPT-bit set, J - Join SPT
Interface state: F - Forwarding, P - Pruned, L - Local
(192.168.2.1, 224.0.17.17), uptime 00:00:05
Owner: PIM-DM, Flags: D
Incoming Interface: VLAN2, RPF neighbor: 192.168.2.1
Outgoing Interface List:
VLAN1(F)
Console#
Table 32: show ip mroute - display description
Field Description
Flags
The flags associated with this entry:
â—†
D (Dense) - PIM Dense mode in use.
â—†
S (Sparse) - PIM Sparse mode in use.
â—†
s (SSM) - A multicast group with the range of IP addresses used for
PIM-SSM.
â—†
C (Connected) - A member of the multicast group is present on
this interface.
â—†
P (Pruned) - This route has been terminated.
â—†
F (Register flag) - This device is registering for a multicast source.
â—†
R (RP-bit set) - The (S,G) entry is pointing to the Rendezvous Point
(RP), which normally indicates a pruned state along the shared
tree for a particular source.
â—†
T (SPT-bit set) - Multicast packets have been received from a
source on the shortest path tree.
â—†
J (Join SPT) - The rate of traffic arriving over the shared tree has
exceeded the SPT-threshold for this group. If the SPT flag is set for
(*,G) entries, the next (S,G) packet received will cause the router to
join the shortest path tree. If the SPT flag is set for (S,G), the router
immediately joins the shortest path tree.
Interface state
The multicast state for the displayed interface.
group address
IP multicast group address for a requested service.
source
Subnetwork containing the IP multicast source.
uptime
The time elapsed since this entry was created.
Owner
The associated multicast protocol (PIM).
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