M4100 managed switches in series - dropping connection briefly

Question

Hi all,&nbsp;Firstly, I'm totally new to this forum and have searched for my issue without success.. so apologies if this has been discussed before.&nbsp;The problem...I have an issue with a user using Skype at his home. He complains about calls being dropped and having brief disconnections from the internet. I have had the devices at his house on continuous ping, and have seen that they are not responding from time to time.. only a few pings dropped at a time (from 1 to 5; not&nbsp;necessarily&nbsp;all together).&nbsp;Our setup:There is a server room with an M4100 50G switch in it providing fibre connection to an M4100-D12G device approx. 250 meters away. This smaller switch then has another M4100-D12G connected via fibre again (150 meters this time). This second switch is close to the user’s house. We have three wires running into his house: one for his laptop (at his request) and two for two wireless access points installed at the house.I don’t have any special configuration on the switches, other than and static IP and access for the two VLANs we are using (ports are set to trunk)&nbsp;At the risk of sounding stupid (!), is there something I'm missing config wise? What reason would the switches have to drop connection between each other like this?!&nbsp;Any help is most welcome!&nbsp;Thanks,&nbsp;Neil

JohnRo · Answer

Hello&nbsp;nhickey,&nbsp;

&nbsp;

Welcome to the community!&nbsp;

&nbsp;

I believe it is best to try and isolate the issue first. Try running a traceroute or Wireshark&nbsp;and locate where the packets are being dropped. Also, it is best to make sure that the firmware versions of the devices are all updated.&nbsp;

&nbsp;

Thanks,

Retired_Member · Answer

Hi nhichey,
&nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Welcome to the community!&nbsp;
&nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;I suggest you could check the port statistics at first, it can judge whether the port discard packet or not.
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Login the Switch web GUI, go to 'Monitoring'--&gt;'Ports'--&gt;'Port Detailed Statistics', check the couter of 'Total Transmit Errors' and 'Total Transmit Packets Discarded'.&nbsp;
&nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;For further analysis, could you please provide the network topology and switch configuration.
&nbsp;
Thanks,
EricNETGEAR® Community Team
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;

nhickey · Answer

Hi John / Erik,&nbsp;Thanks for your replys.. they are much appreciated, and also excuse the delay getting back to you!&nbsp;I have checked the port statistics as suggested. There are four ports in use, but they are all showing '0' for total transmit errors and total transmit packets discarded. When I try to ping the switch IP I get periodic breaks, so I figured that the uplink port (port 12 fibre port) would show an error, but it did not. Here is the statistics from the port, the stats were cleared in the last hour and a half, but the user has complained of drop out in that time period.. can you guys can see something I'm missing?:&nbsp;Interface0/12&nbsp;MST IDCST&nbsp;ifIndex12&nbsp;Port TypeNormal&nbsp;Port Channel IDDisable&nbsp;Port RoleDesignated&nbsp;STP ModeEnable&nbsp;STP StateForwarding&nbsp;Admin ModeEnable&nbsp;Flow Control ModeDisable&nbsp;LACP ModeEnable&nbsp;Physical ModeAuto&nbsp;Physical Status1000 Mbps&nbsp;Link StatusLink Up&nbsp;Link TrapEnable&nbsp;Packets RX and TX 64 Octets78023&nbsp;Packets RX and TX 65-127 Octets114250&nbsp;Packets RX and TX 128-255 Octets38808&nbsp;Packets RX and TX 256-511 Octets27107&nbsp;Packets RX and TX 512-1023 Octets9823&nbsp;Packets RX and TX 1024-1518 Octets56225&nbsp;Packets RX and TX 1519-2047 Octets0&nbsp;Packets RX and TX 2048-4095 Octets0&nbsp;Packets RX and TX 4096-9216 Octets0&nbsp;Octets Received106342746&nbsp;Packets Received 64 Octets65226&nbsp;Packets Received 65-127 Octets65099&nbsp;Packets Received 128-255 Octets34937&nbsp;Packets Received 256-511 Octets22983&nbsp;Packets Received 512-1023 Octets7947&nbsp;Packets Received 1024-1518 Octets51359&nbsp;Packets Received &gt; 1518 Octets9&nbsp;Total Packets Received Without Errors230492&nbsp;Unicast Packets Received82407&nbsp;Multicast Packets Received56898&nbsp;Broadcast Packets Received91187&nbsp;Receive Packets Discarded0&nbsp;Total Packets Received with MAC Errors14255&nbsp;Jabbers Received0&nbsp;Fragments Received200&nbsp;Undersize Received0&nbsp;Alignment Errors0&nbsp;Rx FCS Errors14055&nbsp;Overruns0&nbsp;Total Received Packets Not Forwarded9&nbsp;802.3x Pause Frames Received0&nbsp;Unacceptable Frame Type0&nbsp;Total Packets Transmitted (Octets)15104341&nbsp;Packets Transmitted 64 Octets12797&nbsp;Packets Transmitted 65-127 Octets49151&nbsp;Packets Transmitted 128-255 Octets3871&nbsp;Packets Transmitted 256-511 Octets4124&nbsp;Packets Transmitted 512-1023 Octets1876&nbsp;Packets Transmitted 1024-1518 Octets4866&nbsp;Packets Transmitted &gt; 1518 Octets0&nbsp;Maximum Frame Size1518&nbsp;Total Packets Transmitted Successfully76685&nbsp;Unicast Packets Transmitted66702&nbsp;Multicast Packets Transmitted6101&nbsp;Broadcast Packets Transmitted3882&nbsp;Transmit Packets Discarded0&nbsp;Total Transmit Errors0&nbsp;Total Transmit Packets Discarded0&nbsp;Single Collision Frames0&nbsp;Multiple Collision Frames0&nbsp;Excessive Collision Frames0&nbsp;STP BPDUs Received0&nbsp;STP BPDUs Transmitted0&nbsp;RSTP BPDUs Received6&nbsp;RSTP BPDUs Transmitted2738&nbsp;MSTP BPDUs Received0&nbsp;MSTP BPDUs Transmitted0&nbsp;802.3x Pause Frames Transmitted0&nbsp;GVRP PDUs Received0&nbsp;GVRP PDUs Transmitted0&nbsp;GVRP Failed Registrations0&nbsp;GMRP PDUs Received0&nbsp;GMRP PDUs Transmitted0&nbsp;GMRP Failed Registrations0&nbsp;EAPOL Frames Received0&nbsp;EAPOL Frames Transmitted0&nbsp;Time Since Counters Last Cleared0 day 1 hr 31 min 47 sec&nbsp;Thanks So so much,&nbsp;Neil

Retired_Member · Answer

Hi nhickey,
&nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Thanks for your updating immediately.
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;I found that there is some 'Rx FCS Errors' in the&nbsp;port statistics. Which type fiber&nbsp;module you are using? Could you change another pair of fiber module and try again?
&nbsp;
&nbsp;
Thanks,
EricNETGEAR Employee

nhickey · Answer

Hi Eric,&nbsp;The SFP mudule we are using is a Netgear one.. here's a link:&nbsp;https://www.netgear.com/business/products/switches/modules-accessories/agm732f.aspx?cid=wmt_netgear_organic&nbsp;Could there be a fault in the cable?? The trouble is, the cable connecting the two switches is under ground!&nbsp;We have no spare SFP modules, and would need to get new ones. Would you recommend we do that?&nbsp;Thanks,&nbsp;Neil&nbsp;

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M4100 managed switches in series - dropping connection briefly

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ProSupport for Business

Interface	0/12
MST ID	CST
ifIndex	12
Port Type	Normal
Port Channel ID	Disable
Port Role	Designated
STP Mode	Enable
STP State	Forwarding
Admin Mode	Enable
Flow Control Mode	Disable
LACP Mode	Enable
Physical Mode	Auto
Physical Status	1000 Mbps
Link Status	Link Up
Link Trap	Enable
Packets RX and TX 64 Octets	78023
Packets RX and TX 65-127 Octets	114250
Packets RX and TX 128-255 Octets	38808
Packets RX and TX 256-511 Octets	27107
Packets RX and TX 512-1023 Octets	9823
Packets RX and TX 1024-1518 Octets	56225
Packets RX and TX 1519-2047 Octets	0
Packets RX and TX 2048-4095 Octets	0
Packets RX and TX 4096-9216 Octets	0
Octets Received	106342746
Packets Received 64 Octets	65226
Packets Received 65-127 Octets	65099
Packets Received 128-255 Octets	34937
Packets Received 256-511 Octets	22983
Packets Received 512-1023 Octets	7947
Packets Received 1024-1518 Octets	51359
Packets Received > 1518 Octets	9
Total Packets Received Without Errors	230492
Unicast Packets Received	82407
Multicast Packets Received	56898
Broadcast Packets Received	91187
Receive Packets Discarded	0
Total Packets Received with MAC Errors	14255
Jabbers Received	0
Fragments Received	200
Undersize Received	0
Alignment Errors	0
Rx FCS Errors	14055
Overruns	0
Total Received Packets Not Forwarded	9
802.3x Pause Frames Received	0
Unacceptable Frame Type	0
Total Packets Transmitted (Octets)	15104341
Packets Transmitted 64 Octets	12797
Packets Transmitted 65-127 Octets	49151
Packets Transmitted 128-255 Octets	3871
Packets Transmitted 256-511 Octets	4124
Packets Transmitted 512-1023 Octets	1876
Packets Transmitted 1024-1518 Octets	4866
Packets Transmitted > 1518 Octets	0
Maximum Frame Size	1518
Total Packets Transmitted Successfully	76685
Unicast Packets Transmitted	66702
Multicast Packets Transmitted	6101
Broadcast Packets Transmitted	3882
Transmit Packets Discarded	0
Total Transmit Errors	0
Total Transmit Packets Discarded	0
Single Collision Frames	0
Multiple Collision Frames	0
Excessive Collision Frames	0
STP BPDUs Received	0
STP BPDUs Transmitted	0
RSTP BPDUs Received	6
RSTP BPDUs Transmitted	2738
MSTP BPDUs Received	0
MSTP BPDUs Transmitted	0
802.3x Pause Frames Transmitted	0
GVRP PDUs Received	0
GVRP PDUs Transmitted	0
GVRP Failed Registrations	0
GMRP PDUs Received	0
GMRP PDUs Transmitted	0
GMRP Failed Registrations	0
EAPOL Frames Received	0
EAPOL Frames Transmitted	0
Time Since Counters Last Cleared	0 day 1 hr 31 min 47 sec