IGMP Snooping

cuong · December 2018

Dear Guys,

I have a network diagram as below:

Image: https://us.v-cdn.net/6029482/uploads/editor/2p/jt6vi5ux0vnv.jpg

I got problem with change between channel's are slow on TV , It's take time 5s.
The technician from LG ask me for optimize igmp snooping on switch.
Please help me for tuning igmp snooping on switch.

My configuration:
XGS4600-32(SW1):

interface port-channel 18
qos priority 7
pvid 99
exit
interface port-channel 19
qos priority 7
pvid 99
exit

igmp-snooping
igmp-snooping 8021p-priority 7
igmp-snooping host-timeout 200
igmp-snooping unknown-multicast-frame drop
igmp-snooping querier

GS1920-48(SW2):

igmp-snooping
igmp-snooping 8021p-priority 7
igmp-snooping host-timeout 300
igmp-snooping unknown-multicast-frame drop
igmp-snooping filtering profile MyTV start-address 232.84.1.1 end-address 234.68.68.254

interface port-channel 1
qos priority 7
pvid 99
igmp-snooping leave-mode immediate
loopguard
exit

interface port-channel 47
qos priority 7
pvid 250
igmp-snooping querier-mode fixed
igmp-snooping leave-mode fast
dhcp snooping trust
exit

interface port-channel 48
qos priority 7
pvid 250
igmp-snooping querier-mode fixed
igmp-snooping leave-mode fast
dhcp snooping trust
exit

GS1920-48(SW3):

igmp-snooping
igmp-snooping 8021p-priority 7
igmp-snooping host-timeout 300
igmp-snooping unknown-multicast-frame drop
igmp-snooping filtering profile MyTV start-address 232.84.1.1 end-address 234.68.68.254

interface port-channel 1
qos priority 7
pvid 99
igmp-snooping leave-mode immediate
loopguard
exit

interface port-channel 48
qos priority 7
pvid 250
igmp-snooping querier-mode fixed
igmp-snooping leave-mode fast
dhcp snooping trust
exit
--------------------------
Range IP channel IPTV ISP:
232.84.1.1 - 232.84.2.254

IP channel 1 of Streaming Media:
234.68.68.69:5000

Thanks and Best Regards,

Zyxel_JonasTan · December 2018

Hi @cuong,

Based on the description, I would like to clarify the following to avoid misunderstanding.
1. Based on the topology, does the IPTV traffic path is FTTH > IPTV ISP > LG Media server > TV LG?
2. You mean that after changing the channel, it took the stream 5 seconds to display the image on TV, am I right?

For the configuration:
1. We don't recommend to configuring the 802.1P to priority 7. Because priority 7 is for system handling the routine task. We recommend modified to priority 5 is sufficient.
2. IPTV ISP range multicast is 232.84.1.1 - 232.84.2.254. I'm curious that how does the TV watch the streaming IP channel 1 of 234.68.68.69:5000.
3. About the leave mode, I suggest configuring normal leave between switches:
Eg. SW1 (port 25) & SW2 (port47) / SW2 (port 48) & SW3 (port 48) configure normal leave.
Then observe if the issue is solved.
4. If not, to narrow down the situation, may I know if it is convenient to make a test by moving the LG TV (left) directly connect to XGS4600-32 (SW1) and observe if the issue still exists.

Thanks for supporting Zyxel!

cuong · December 2018

Dear Jonas,

1. The topology as below:
IPTV ISP--->SW L3----> SW L2---> TV.
LG media server is CMS server.
2. Your understanding is correct.
3. I had changed to normal leave. The issue isn't resolved
4. The issue still exists.

Thank and Best Regards,

CrazyTacos · December 2018

Is it possible that's just how the LGTV behaves?
Are the multicast stream perhaps encrypted?
Maybe try using VLC player to watch your streams and see if switching channels also shows 5sec delays.

Zyxel_JonasTan · December 2018

Hi @cuong,

Thanks for the test result.
Please help to make a test with the following to trace out the root cause of the event:

1. Moved the left LG TV and directly connect to XGS4600 port 1.
2. Configure Static Multicast Forwarding on XGS4600;
1) MAC-address = 01:00:5e:44:44:45 (234.68.68.69)
2) VID = 99
3) port = 1

Note: Static multicast forwarding is a feature that fixing the channel group to the IGMP table permanently to always forwarding the multicast traffic. So the result must have no delay of the stream because it doesn't need to process the normal multicast flow to create the IGMP table.

3. Change the LG TV to other channels then change back to 234.68.68.69:5000.
4. If the stream issue still exists, it means that it is related to the LGTV behavior.

Hope it helps.

IGMP Snooping

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