Examples
The following is
sample output from the
show
ip
mroute command for a router operating in sparse
mode:
Router# show 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,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel,
Y - Joined MDT-data group, y - Sending to MDT-data group
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode
(*, 224.0.255.3), uptime 5:29:15, RP is 192.168.37.2, flags: SC
Incoming interface: Tunnel0, RPF neighbor 10.3.35.1, Dvmrp
Outgoing interface list:
Ethernet0, Forward/Sparse, 5:29:15/0:02:57
(192.168.46.0/24, 224.0.255.3), uptime 5:29:15, expires 0:02:59, flags: C
Incoming interface: Tunnel0, RPF neighbor 10.3.35.1
Outgoing interface list:
Ethernet0, Forward/Sparse, 5:29:15/0:02:57
The following is
sample output from the
show
ip
mroute command with the IP multicast group address
232.6.6.6 specified:
Router# show ip mroute 232.6.6.6
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,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel,
Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags:H - Hardware switched
Timers:Uptime/Expires
Interface state:Interface, Next-Hop or VCD, State/Mode
(*, 232.6.6.6), 00:01:20/00:02:59, RP 224.0.0.0, flags:sSJP
Incoming interface:Null, RPF nbr 224.0.0.0
Outgoing interface list:Null
(10.2.2.2, 232.6.6.6), 00:01:20/00:02:59, flags:CTI
Incoming interface:Ethernet3/3, RPF nbr 224.0.0.0
Outgoing interface list:
Ethernet3/1, Forward/Sparse-Dense, 00:00:36/00:02:35
The following is
sample output from the
show
ip
mroute command for a router operating in dense
mode. This output displays the contents of the IP multicast routing table for
the multicast group named cbone-audio.
Router# show ip mroute cbone-audio
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,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel,
Y - Joined MDT-data group, y - Sending to MDT-data group
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode
(*, 224.0.255.1), uptime 0:57:31, expires 0:02:59, RP is 224.0.0.0, flags: DC
Incoming interface: Null, RPF neighbor 224.0.0.0, Dvmrp
Outgoing interface list:
Ethernet0, Forward/Dense, 0:57:31/0:02:52
Tunnel0, Forward/Dense, 0:56:55/0:01:28
(192.168.37.100, 224.0.255.1), uptime 20:20:00, expires 0:02:55, flags: C
Incoming interface: Tunnel0, RPF neighbor 10.20.37.33, Dvmrp
Outgoing interface list:
Ethernet0, Forward/Dense, 20:20:00/0:02:52
The following is
sample output from the
show
ip
mroute command that shows the virtual circuit
descriptor (VCD) value, because an ATM interface with Protocol Independent
Multicast (PIM) multipoint signaling is enabled:
Router# show ip mroute 224.1.1.1
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,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel,
Y - Joined MDT-data group, y - Sending to MDT-data group
Timers: Uptime/Expires
Interface state: Interface, Next-Hop or VCD, State/Mode
(*, 224.1.1.1), 00:03:57/00:02:54, RP 172.16.0.0, flags: SJ
Incoming interface: Null, RPF nbr 224.0.0.0224.0.0.0
Outgoing interface list:
ATM0/0, VCD 14, Forward/Sparse, 00:03:57/00:02:53
The following is
sample output from the
show
ip
mroute command with the
summary
keyword:
Router# show ip mroute summary
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,
X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel,
Y - Joined MDT-data group, y - Sending to MDT-data group
Timers: Uptime/Expires
Interface state: Interface, Next-Hop, State/Mode
(*, 224.255.255.255), 2d16h/00:02:30, RP 172.16.10.13, flags: SJPC
(*, 224.2.127.253), 00:58:18/00:02:00, RP 172.16.10.13, flags: SJC
(*, 224.1.127.255), 00:58:21/00:02:03, RP 172.16.10.13, flags: SJC
(*, 224.2.127.254), 2d16h/00:00:00, RP 172.16.10.13, flags: SJCL
(172.16.160.67, 224.2.127.254), 00:02:46/00:00:12, flags: CLJT
(172.16.244.217, 224.2.127.254), 00:02:15/00:00:40, flags: CLJT
(172.16.8.33, 224.2.127.254), 00:00:25/00:02:32, flags: CLJT
(172.16.2.62, 224.2.127.254), 00:00:51/00:02:03, flags: CLJT
(172.16.8.3, 224.2.127.254), 00:00:26/00:02:33, flags: CLJT
(172.16.60.189, 224.2.127.254), 00:03:47/00:00:46, flags: CLJT
The following is
sample output from the
show
ip
mroute command with the
active
keyword:
Router# show ip mroute active 4
Active IP Multicast Sources - sending >= 4 kbps
Group: 224.2.127.254, (sdr.cisco.com)
Source: 192.168.28.69 (mbone.ipd.anl.gov)
Rate: 1 pps/4 kbps(1sec), 4 kbps(last 1 secs), 4 kbps(life avg)
Group: 224.2.201.241, ACM 97
Source: 192.168.52.160 (webcast3-e1.acm97.interop.net)
Rate: 9 pps/93 kbps(1sec), 145 kbps(last 20 secs), 85 kbps(life avg)
Group: 224.2.207.215, ACM 97
Source: 192.168.52.160 (webcast3-e1.acm97.interop.net)
Rate: 3 pps/31 kbps(1sec), 63 kbps(last 19 secs), 65 kbps(life avg)
The following
partial sample output shows that outbound interface Ethernet 0/2 is blocked.
The data flow on an interface can be blocked because RSVP deleted (denial) the
reservation for the flow or the flow matched an ACL that is subject to RSVP
multicast CAC:
mcast-iou01-2# sho ip mro 237.1.1.2
IP Multicast Routing Table
.
.
.
(40.0.7.200, 237.1.1.2), 00:04:34/00:03:15, flags: T
Incoming interface: Ethernet0/0, RPF nbr 40.0.1.1
Outgoing interface list:
Ethernet0/1, Forward/Sparse-Dense, 00:04:34/00:02:57
Ethernet0/2, Forward/Sparse-Dense, 00:04:16/00:02:33 Blocked
The table below
describes the significant fields shown in the displays.
Table 25. show ip mroute Field
Descriptions
|
Field
|
Description
|
|
Flags:
|
Provides
information about the entry.
-
D--Dense. Entry is operating in dense mode.
-
S--Sparse. Entry is operating in sparse mode.
-
B--Bidir Group. Indicates that a multicast group is operating in bidirectional
mode.
-
s--SSM Group. Indicates that a multicast group is within the SSM range of IP
addresses. This flag is reset if the SSM range changes.
-
C--Connected. A member of the multicast group is present on the directly
connected interface.
|
|
Flags:
(continued)
|
-
L--Local. The router itself is a member of the multicast group. Groups are
joined locally by the
ip
igmp
join-group command (for the configured group),
the
ip
sap
listen command (for the well-known session
directory groups), and rendezvous point (RP) mapping (for the well-known groups
224.0.1.39 and 224.0.1.40). Locally joined groups are not fast switched.
-
P--Pruned. Route has been pruned. The Cisco IOS software keeps this information
so that a downstream member can join the source.
-
R--RP-bit set. Indicates that the (S, G) entry is pointing toward the RP. This
flag typically indicates a prune state along the shared tree for a particular
source.
-
F--Register flag. Indicates that the software is registering for a multicast
source.
-
T--SPT-bit set. Indicates that packets have been received on the shortest path
source tree.
-
J--Join SPT. For (*, G) entries, indicates that the rate of traffic flowing
down the shared tree is exceeding the SPT-Threshold set for the group. (The
default SPT-Threshold setting is 0 kbps.) When the J - Join shortest path tree
(SPT) flag is set, the next (S, G) packet received down the shared tree
triggers an (S, G) join in the direction of the source, thereby causing the
router to join the source tree.
For (S, G) entries, indicates that the entry was created
because the SPT-Threshold for the group was exceeded. When the J - Join SPT
flag is set for (S, G) entries, the router monitors the traffic rate on the
source tree and attempts to switch back to the shared tree for this source if
the traffic rate on the source tree falls below the SPT-Threshold of the group
for more than 1 minute.
| Note
|
The
router measures the traffic rate on the shared tree and compares the measured
rate to the SPT-Threshold of the group once every second. If the traffic rate
exceeds the SPT-Threshold, the J - Join SPT flag is set on the (*, G) entry
until the next measurement of the traffic rate. The flag is cleared when the
next packet arrives on the shared tree and a new measurement interval is
started. If the default SPT-Threshold value of 0 kbps is used for the group,
the J - Join SPT flag is always set on (*, G) entries and is never cleared.
When the default SPT-Threshold value is used, the router immediately switches
to the shortest path source tree when traffic from a new source is received.
|
-
M--MSDP created entry. Indicates that a (*, G) entry was learned through a
Multicast Source Discovery Protocol (MSDP) peer. This flag is applicable only
for an RP running MSDP.
-
E--Extranet source mroute entry. Indicates that a (*, G) or (S, G) entry in the
VRF routing table is a source Multicast VRF (MVRF) entry and has extranet
receiver MVRF entries linked to it.
-
X--Proxy Join Timer Running. Indicates that the proxy join timer is running.
This flag is set only for (S, G) entries of an RP or “turnaround” router. A
“turnaround” router is located at the intersection of a shared path (*, G) tree
and the shortest path from the source to the RP.
-
A--Candidate for MSDP Advertisement. Indicates that an (S, G) entry was
advertised through an MSDP peer. This flag is applicable only for an RP running
MSDP.
-
U--URD. Indicates that a URL Rendezvous Directory (URD) channel subscription
report was received for the (S, G) entry.
-
I--Received Source Specific Host Report. Indicates that an (S, G) entry was
created by an (S, G) report. This (S, G) report could have been created by
Internet Group Management Protocol Version 3 (IGMPv3), URD, or IGMP v3lite.
This flag is set only on the designated router (DR).
-
Z--Multicast Tunnel. Indicates that this entry is an IP multicast group that
belongs to the Multicast Distribution Tree (MDT) tunnel. All packets received
for this IP multicast state are sent to the MDT tunnel for decapsulation.
-
Y--Joined MDT-data group. Indicates that the traffic was received through an
MDT tunnel that was set up specifically for this source and group. This flag is
set in Virtual Private Network (VPN) mroute tables only.
-
y--Sending to MDT-data group. Indicates that the traffic was sent through an
MDT tunnel that was set up specifically for this source and group. This flag is
set in VPN mroute tables only.
|
|
Outgoing
interface flags:
|
Provides
information about the entry.
|
|
Timers:Uptime/Expires
|
“Uptime”
indicates per interface how long (in hours, minutes, and seconds) the entry has
been in the IP multicast routing table. “Expires” indicates per interface how
long (in hours, minutes, and seconds) until the entry will be removed from the
IP multicast routing table.
|
|
Interface
state:
|
Indicates
the state of the incoming or outgoing interface.
-
Interface. Indicates the type and number of the interface listed in the
incoming or outgoing interface list.
-
Next-Hop or VCD. “Next-hop” specifies the IP address of the downstream
neighbor. “VCD” specifies the virtual circuit descriptor number. “VCD0” means
the group is using the static map virtual circuit.
-
State/Mode. “State” indicates that packets will either be forwarded, pruned, or
null on the interface depending on whether there are restrictions due to access
lists or a time-to-live (TTL) threshold. “Mode” indicates whether the interface
is operating in dense, sparse, or sparse-dense mode.
|
|
(*,
224.0.255.1) and (192.168.37.100, 224.0.255.1)
|
Entry in
the IP multicast routing table. The entry consists of the IP address of the
source followed by the IP address of the multicast group. An asterisk (*) in
place of the source router indicates all sources.
Entries
in the first format are referred to as (*, G) or “star comma G” entries.
Entries in the second format are referred to as (S, G) or “S comma G” entries.
(*, G) entries are used to build (S, G) entries.
|
|
RP
|
Address
of the RP router. For routers and access servers operating in sparse mode, this
address is always 224.0.0.0.
|
|
flags:
|
Information about the entry.
|
|
Incoming
interface:
|
Expected
interface for a multicast packet from the source. If the packet is not received
on this interface, it is discarded.
|
|
RPF
neighbor or RPF nbr
|
IP
address of the upstream router to the source. Tunneling indicates that this
router is sending data to the RP encapsulated in register packets. The
hexadecimal number in parentheses indicates to which RP it is registering. Each
bit indicates a different RP if multiple RPs per group are used. If an asterisk
(*) appears after the IP address in this field, the RPF neighbor has been
learned through an assert.
|
|
Outgoing
interface list:
|
Interfaces through which packets will be forwarded.
When the
ip
pim
nbma-mode command is enabled on the interface, the
IP address of the Protocol Independent Multicast (PIM) neighbor is also
displayed.
The
Blocked keyword will be displayed in the output if the interface is blocked
(denied) by RSVP mulicast CAC.
|
The following is
sample output from the
show
ip
mroute command with the
count
keyword:
Router# show ip mroute count
IP Multicast Statistics
4045 routes using 2280688 bytes of memory
41 groups, 97.65 average sources per group
Forwarding Counts:Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts:Total/RPF failed/Other drops(OIF-null, rate-limit etc)
Group:239.0.18.1, Source count:200, Packets forwarded:348232, Packets received:348551
RP-tree:Forwarding:12/0/218/0, Other:12/0/0
Source:10.1.1.1/32, Forwarding:1763/1/776/9, Other:1764/0/1
Source:10.1.1.2/32, Forwarding:1763/1/777/9, Other:1764/0/1
Source:10.1.1.3/32, Forwarding:1763/1/783/10, Other:1764/0/1
Source:10.1.1.4/32, Forwarding:1762/1/789/10, Other:1763/0/1
Source:10.1.1.5/32, Forwarding:1762/1/768/10, Other:1763/0/1
Source:10.1.1.6/32, Forwarding:1793/1/778/10, Other:1794/0/1
Source:10.1.1.7/32, Forwarding:1793/1/763/10, Other:1794/0/1
Source:10.1.1.8/32, Forwarding:1793/1/785/10, Other:1794/0/1
Source:10.1.1.9/32, Forwarding:1793/1/764/9, Other:1794/0/1
Source:10.1.1.10/32, Forwarding:1791/1/774/10, Other:1792/0/1
Source:10.1.2.1/32, Forwarding:1689/1/780/10, Other:1691/0/2
Source:10.1.2.2/32, Forwarding:1689/1/782/10, Other:1691/0/2
Source:10.1.2.3/32, Forwarding:1689/1/776/9, Other:1691/0/2
.
.
.
Group:239.0.18.132, Source count:0, Packets forwarded:8810, Packets received:8810
RP-tree:Forwarding:8810/7/780/49, Other:8810/0/0
Group:239.0.17.132, Source count:0, Packets forwarded:704491, Packets received:704491
RP-tree:Forwarding:704491/639/782/4009, Other:704491/0/0
Group:239.0.17.133, Source count:0, Packets forwarded:704441, Packets received:704441
RP-tree:Forwarding:704441/639/782/3988, Other:704441/0/0
Group:239.0.18.133, Source count:0, Packets forwarded:8810, Packets received:8810
RP-tree:Forwarding:8810/8/786/49, Other:8810/0/0
Group:239.0.18.193, Source count:0, Packets forwarded:0, Packets received:0
Group:239.0.17.193, Source count:0, Packets forwarded:0, Packets received:0
Group:239.0.18.134, Source count:0, Packets forwarded:8803, Packets received:8803
RP-tree:Forwarding:8803/8/774/49, Other:8803/0/0
Note |
The RP-tree
field is displayed only for non-SSM groups that have a (*, G) entry and a
positive packet received count.
|
The following is
sample output from the
show
ip
mroute command with the
count and
terse
keywords:
Router# show ip mroute count terse
IP Multicast Statistics
4 routes using 2610 bytes of memory
3 groups, 0.33 average sources per group
The table below
describes the significant fields shown in the displays.
Table 26. show ip mroute count Field
Descriptions
|
Field
|
Description
|
|
Group:
|
Summary
statistics for traffic on an IP multicast group G. This row is displayed only
for non-SSM groups.
|
|
Forwarding Counts:
|
Statistics on the packets that are received and forwarded to at least one
interface.
| Note
|
There
is no specific command to clear only the forwarding counters; you can clear
only the actual multicast forwarding state with the
clear
ip
mroute command. Issuing this command will cause
interruption of traffic forwarding.
|
|
|
Pkt
Count/
|
Total
number of packets received and forwarded since the multicast forwarding state
to which this counter applies was created.
|
|
Pkts per
second/
|
Number of
packets received and forwarded per second. On an IP multicast fast-switching
platform, this number is the number of packets during the last second. Other
platforms may use a different approach to calculate this number. Please refer
to the platform documentation for more information.
|
|
Avg Pkt
Size/
|
Total
number of bytes divided by the total number of packets for this multicast
forwarding state. There is no direct display for the total number of bytes. You
can calculate the total number of bytes by multiplying the average packet size
by the packet count.
|
|
Kilobits
per second
|
Bytes per
second divided by packets per second divided by 1000. On an IP multicast
fast-switching platform, the number of packets per second is the number of
packets during the last second. Other platforms may use a different approach to
calculate this number. Please refer to the platform documentation for more
information.
|
|
Other
counts:
|
Statistics on the received packets. These counters include statistics about the
packets received and forwarded and packets received but not forwarded.
|
|
Total/
|
Total
number of packets received.
|
|
RPF
failed/
|
Number of
packets not forwarded due to a failed RPF or acceptance check (when bidir-PIM
is configured).
|
|
Other
drops (OIF-null, rate-limit etc)
|
Number of
packets not forwarded for reasons other than an RPF or acceptance check (such
as the OIF list was empty or because the packets were discarded because of a
configuration, such as
ip
multicast
rate-limit , was enabled).
|
|
Group:
|
Summary
information about counters for (*, G) and the range of (S, G) states for one
particular group G. The following RP-tree: and Source: output fields contain
information about the individual states belonging to this group.
| Note
|
For SSM
range groups, the groups displayed after the Group output field are
statistical. All SSM range (S, G) states are individual, unrelated SSM
channels.
|
|
|
Source
count:
|
Number of
(S, G) states for this group G. Individual (S, G) counters are detailed in the
output field rows.
|
|
Packets
forwarded:
|
The sum
of the packets detailed in the Forwarding Counts fields for this IP multicast
group G. This field is the sum of the RP-tree and all Source fields for this
group G.
|
|
Packets
received:
|
The sum
of packets detailed in the Other counts fields for this IP multicast group G.
This field is the sum of the Other counts and Pkt Count fields of the RP-tree
and Source rows for this group G.
|
|
RP-tree:
|
Counters
for the (*, G) state of this group G. These counters are displayed only for
groups that have a forwarding mode that does not forward packets on the shared
tree. These (*, G) groups are bidir-PIM and PIM sparse mode (PIM-SM) groups.
There are no RP-tree displays for PIM dense mode (PIM-DM) and SSM range groups.
|
|
Source:
|
Counters
for an individual (S, G) state of this group G. There are no (S, G) states for
bidir-PIM groups.
|
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