Troubleshooting

Efficient Video Distribution Networks with.Multicast: IGMP Querier and PIM-DM
17
Note: Allow a few seconds for the video to begin playing locally on the Video Server. At that
point, the video is also being transmitted to the multicast stream.
Note: Some MP4 files will only display the first video frame locally on the server, but are still
being streamed to the clients, which is seen by the progress bar below the display. To get
around this issue, stream WMV/WMA or other files.
14. Pressing the Loop button at the bottom of the VLC screen will keep the file playing in a
continuous loop. This is optional but is very helpful when setting up clients for testing.
From a Multicast Client (Receiver):
1. Start VLC Player.
2. Select Media -> Open Network Stream...
3. Enter the Network URL: RTP://239.0.0.xx:5004 (an address from steps 8 and 9 above).
4. Click Play.
CAUTION: Seeing the video playing on the client does not ensure multicast is working,
because it may be receiving a broadcast stream if multicast is not set up correctly. Be
sure to test the multicast setup as instructed in the next section.
The client port has now joined the multicast group. Allow a few seconds for the video to begin
playing. When the Loop button on the server is pressed in, the video will repeat on the clients as well.
Repeat the Sender and Receiver steps on the other sender (server) and receivers (clients) on the
network to create multiple multicasts groups and clients viewing multiple videos.
Testing the Multicast Setup
To check the Multicast IGMP setup on each switch, run the show commands for IGMP and multicast and
run Wireshark to capture and analyze the traffic.
Show Commands for IGMP and Multicast Table 4.
Show Commands
Description
show statistics tengigabitethernet <port> |
include Multicast
Shows number of multicast packets sent/received
on port specified.
show ip igmp snooping groups
Run from a IGMP snooping switch to show ports
that have joined the group. This command can be
used seconds after joining or leaving a group to
verify the ports have in fact joined or left the
group. For this example, look for the group with
an IP ending in 0.0.1. This can be run on an IGMP
snooping switch. Other switches will not show any
entries.