Chapter 51
| Multicast Routing Commands
General Multicast Routing
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Incoming Interface: VLAN2, RPF neighbor: FE80::0303
Outgoing Interface List:
VLAN1(F)
Console#
Table 33: show ip mroute - display description
Field Description
Flags
The flags associated with this entry:
◆
D (Dense) - PIM Dense mode in use.
◆
S (Sparse) - PIM Sparse mode in use.
◆
s (SSM) - A multicast group with the range of IP addresses used for
PIM-SSM.
◆
C (Connected) - A member of the multicast group is present on
this interface.
◆
P (Pruned) - This route has been terminated.
◆
F (Register flag) - This device is registering for a multicast source.
◆
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.
◆
T (SPT-bit set) - Multicast packets have been received from a
source on the shortest path tree.
◆
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).
Incoming Interface
Interface leading to the upstream neighbor.
PIM creates a multicast routing tree based on the unicast routing table.
If the related unicast routing table does not exist, PIM will still create a
multicast routing entry, but displays “Null” for the upstream interface to
indicate that the unicast routing table is not valid. This field may also
display “Register” to indicate that a pseudo interface is being used to
send or receive PIM-SM register packets.
RPF neighbor
IP address of the multicast router immediately upstream for this group.
Outgoing interface
list and flags
The interface(s) on which multicast subscribers have been recorded.
The flags associated with each interface indicate:
◆
F (Register flag) - This device is registering for a multicast source.
◆
P (Pruned) - This route has been terminated.
◆
L (Local) - Downstream interface has received IGMP report
message from host in this subnet.
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