- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page
Switch drop PTP multicast
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi ,
I try to configure a m4300 8x8f switch with three connected devices, a PTP source and two PTP receiver. But i have a problem, the switch seems to drop every ptp multicast packet. I have activated the general routing, routing on every interface, pim dense mode, igmp. In addition i can see the ptp multicast group on "routing/multicast/mroute table" with the right interface/ip source. Any advises will be welcome.
Best regards
Solved! Go to Solution.
Accepted Solutions
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Problem fixed, IGMP on master clock was is in version 2 but IGMP on netgear switch was is in version 3. Downgrade to version 2 and all works fine.
All Replies

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @KrustyK
Welcome to the community!
For further analysis, Could you please provide the tech-support file of the Switch:
How do I send tech-support files from my Managed Switch to NETGEAR community moderators?
http://kb.netgear.com/app/answers/detail/a_id/31439
Hope it helps!
Regards,
EricZ
NETGEAR employe
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Thanks for the quick reply, I've email the support (to your attention) with the appropriate files.

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @KrustyK,
Got the tech-support file from you. Thanks again!
Looks like the configuration is correct!
Could you please run CLI command on the switch as below:
1. show ip mroute summary
2. show ip igmp groups x/x/x(the PTP receiver port number)
3. show interface counters(do 'clear counters all' first)
BTW: I try on local switch, it's success. DUT can forward the multicast packet success.
(M4300) #show ip mroute summary
Multicast route table summary
Incoming Outgoing
Source IP Group IP Protocol Interface Interface List
--------------- --------------- ---------- --------- ---------------
192.168.2.1 239.1.1.1 PIMDM 1/5/1 1/11/1 1/11/2
(M4300) #show ip igmp groups 1/11/1
IP Address..................................... 192.168.4.2
Subnet Mask.................................... 255.255.255.0
Interface Mode................................. Enabled
Querier Status................................. Querier
Multicast Group IP............................. 239.1.1.1
(M4300) #show ip igmp groups 1/11/2
IP Address..................................... 192.168.5.2
Subnet Mask.................................... 255.255.255.0
Interface Mode................................. Enabled
Querier Status................................. Querier
Multicast Group IP............................. 239.1.1.1
(M4300) #

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @KrustyK,
Sorry, I notice that you disable igmp on global config, so it will cause switch cannot learning PTP receiver info.
So please remove below config and try agian:
no set igmp
no set igmp header-validation
no set igmp querier
no set igmp proxy-querier
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Just to be sure, to remove:
no set igmp
no set igmp header-validation
no set igmp querier
no set igmp proxy-querier
I have to enter:
set igmp
set igmp header-validation
set igmp querier
set igmp proxy-querier
In the global config menu ?
But, in the web interface IGMP is enable, maybe it's a bug ?
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
@Retired_Member
I have try:
set igmp
set igmp header-validation
set igmp querier
set igmp proxy-querier
But PTP multicast traffic is still dropped.
So, this is the results of the commands:
1. show ip mroute summary
Multicast route table summary
Incoming Outgoing
Source IP Group IP Protocol Interface Interface List
--------------- --------------- ---------- --------- ---------------
192.168.4.1 224.0.1.129 PIMDM 1/0/9
2. i. show ip igmp groups 1/0/11
IP Address..................................... 192.168.2.2
Subnet Mask.................................... 255.255.255.0
Interface Mode................................. Enabled
Querier Status................................. Querier
2. ii. show ip igmp groups 1/0/13
IP Address..................................... 192.168.5.2
Subnet Mask.................................... 255.255.255.0
Interface Mode................................. Enabled
Querier Status................................. Querier
3. show interface counters
Port InOctets InUcastPkts InMcastPkts InBcastPkts InDropPkts
--------- ---------------- ---------------- ---------------- ---------------- ----------------
1/0/1 0 0 0 0 0
1/0/2 0 0 0 0 0
1/0/3 0 0 0 0 0
1/0/4 0 0 0 0 0
1/0/5 0 0 0 0 0
1/0/6 0 0 0 0 0
1/0/7 0 0 0 0 0
1/0/8 0 0 0 0 0
1/0/9 800 0 8 0 0
1/0/10 0 0 0 0 0
1/0/11 3243 46 0 0 0
1/0/12 0 0 0 0 0
1/0/13 0 0 0 0 0
1/0/14 0 0 0 0 0
1/0/15 0 0 0 0 0
1/0/16 0 0 0 0 0
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
@Retired_Member
I have try:
set igmp
set igmp header-validation
set igmp querier
set igmp proxy-querier
But PTP multicast traffic is still dropped.
So, this is the results of the commands:
1. show ip mroute summary
Multicast route table summary
Incoming Outgoing
Source IP Group IP Protocol Interface Interface List
--------------- --------------- ---------- --------- ---------------
192.168.4.1 224.0.1.129 PIMDM 1/0/9
2. i. show ip igmp groups 1/0/11
IP Address..................................... 192.168.2.2
Subnet Mask.................................... 255.255.255.0
Interface Mode................................. Enabled
Querier Status................................. Querier
2. ii. show ip igmp groups 1/0/13
IP Address..................................... 192.168.5.2
Subnet Mask.................................... 255.255.255.0
Interface Mode................................. Enabled
Querier Status................................. Querier
3. show interface counters
Port InOctets InUcastPkts InMcastPkts InBcastPkts InDropPkts
--------- ---------------- ---------------- ---------------- ---------------- ----------------
1/0/1 0 0 0 0 0
1/0/2 0 0 0 0 0
1/0/3 0 0 0 0 0
1/0/4 0 0 0 0 0
1/0/5 0 0 0 0 0
1/0/6 0 0 0 0 0
1/0/7 0 0 0 0 0
1/0/8 0 0 0 0 0
1/0/9 800 0 8 0 0
1/0/10 0 0 0 0 0
1/0/11 3243 46 0 0 0
1/0/12 0 0 0 0 0
1/0/13 0 0 0 0 0
1/0/14 0 0 0 0 0
1/0/15 0 0 0 0 0
1/0/16 0 0 0 0 0

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @KrustyK
It's IGMP snooping global config.
'set igmp' is for IGMP Snooping global config;
'ip igmp' is for IGMP global config;
According to your cli command display info, looks like port 1/0/11 and 1/0/13 didn't learn IGMP groups(224.0.1.129) member. One more question: Is the PTP receiver can generate IGMP report to join the groups(224.0.1.129)?
Could you please collect the IGMP packet statistics for port 1/0/11 and 1/0/13, the command as below:
show ip igmp interface stats 1/0/11
show ip igmp interface stats 1/0/13
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @Retired_Member,
I've enabled igmp snooping and igmp with:
'set igmp' and 'ip igmp'.
But, I've a question, IGMP can works on Netgear equipments without IGMP snooping ?
Yes, my ptp receivers can generate IGMP reports, in direct connection everything works fine.
The results of:
........ 0
(M4300-8X8F) (Config)#show ip igmp interface stats 1/0/11
Querier Status................................. Querier
Querier IP Address............................. 192.168.2.2
Querier Up Time (hh:mm:ss) .................... 00:05:31
Querier Expiry Time (hh:mm:ss) ................ 00:00:00
Wrong Version Queries Received................. 0
Number of Joins Received....................... 0
Number of Groups............................... 0
(M4300-8X8F) (Config)#show ip igmp interface stats 1/0/13
Querier Status................................. Querier
Querier IP Address............................. 192.168.5.2
Querier Up Time (hh:mm:ss) .................... 00:08:01
Querier Expiry Time (hh:mm:ss) ................ 00:00:00
Wrong Version Queries Received................. 0
Number of Joins Received....................... 0
Number of Groups............................... 0

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @KrustyK
1. It's must enable global IGMP Snooping(but not necessary to enable on VLAN and port);
2. From the result of interface ip igmp status, looks like the port 1/0/11 and 1/0/12 didn't receive any IGMP report packet, the statistics is always 0.
(M4300-8X8F) (Config)#show ip igmp interface stats 1/0/11
Querier Status................................. Querier
Querier IP Address............................. 192.168.2.2
Querier Up Time (hh:mm:ss) .................... 00:05:31
Querier Expiry Time (hh:mm:ss) ................ 00:00:00
Wrong Version Queries Received................. 0
Number of Joins Received....................... 0
Number of Groups............................... 0
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @Retired_Member,
The packets is received by the interface connected to the PTP emitter:
#show ip igmp interface stats 1/0/9
Querier Status................................. Querier
Querier IP Address............................. 192.168.4.2
Querier Up Time (hh:mm:ss) .................... 00:46:02
Querier Expiry Time (hh:mm:ss) ................ 00:00:00
Wrong Version Queries Received................. 0
Number of Joins Received....................... 23
Number of Groups............................... 1
And, then dropped by the equipment.
Can you tell me which ip range is considered like multicast ip range for the switch ?
I've seen that netgear equipments have an option "Block Unknown Multicast Address", how can i disable it on m4300 8x8f ?

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Re: Switch drop PTP multicast
Hi @KrustyK
As I understand, the port 1/0/9 connect to PTP Source, the port 1/0/11 and 1/0/13 connect to PTP receiver, am I right?
If so, port 1/0/11 and 1/0/13 should learing IGMP groups from PTP reciever. And on IP mroute table: 1/0/9 should be 'incoming port', 1/0/11 and 1/0/13 should be 'Outgoing port'.
Beside: Switch with treat all RFC defined IP Range as multicast stream, 224.0.0.0—239.255.255.255
- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Problem fixed, IGMP on master clock was is in version 2 but IGMP on netgear switch was is in version 3. Downgrade to version 2 and all works fine.