ECS4660-28F_Management Guide-R03

C HAPTER 52 | Multicast Routing Commands
General Multicast Routing
– 1921 –
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 279: 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.