VLAN traffic forwarding

Question

I have a M4100-26G-POE switch with several vlan trunk ports. Port 1 is the uplink and ports 3,4,5,6 are downlinks, all with same tagged vlans. The traffic forwarding looks more like a hub than a switch, with outbound traffic on each downlink higher than the inbound traffic coming from the uplink. The traffic should just be forwarding to the port that has learned the destination MAC, not all ports tagged with that vlan. Is there a way to solve this?

Here's a screenshot of the port stats:

Screen Shot 2016-04-30 at 5.10.09 AM.png

DaneA · Answer

Hi&nbsp;bfowler9024,

&nbsp;

Kindly answer the questions below:

&nbsp;

a. How is everything connected? &nbsp;It would be best to post a screenshot or image of your detailed network setup.

b. What is the current firmware version of your&nbsp;M4100-26G-POE&nbsp;switch?

c. Does same problem occur if you will reboot the&nbsp;M4100-26G-POE&nbsp;switch?

&nbsp;

Regards,

&nbsp;

DaneA

NETGEAR Community Team

bfowler9024 · Answer

Hello Dane,&nbsp;Sorry for the delay. Firmware is10.0.2.13.&nbsp;I have attached a diagram and traffic graphs. &nbsp;You will see that the traffic coming in from the uplink port 26 is replicated out ports 3,4,5,6 much like a hub rather than a switch.&nbsp;

DaneA · Answer

Hi&nbsp;bfowler9024,&nbsp;
&nbsp;
It seems that you did port mirroring. &nbsp;So far there are no issues logged using firmware v10.0.2.13 just like what you have described here. &nbsp;Can you try to downgrade the firmware to v10.0.2.11 then check if same problem will occur. &nbsp;Make sure to reset the&nbsp;M4100-26G-POE switch back to factory default settings after a successfully downgrading the firmware then reconfigure it from scratch.&nbsp;
&nbsp;
Here is the&nbsp;link&nbsp;where to download&nbsp;v10.0.2.11. &nbsp;
&nbsp;
&nbsp;
Regards,

DaneA
NETGEAR Community Team

bfowler9024 · Answer

Port mirroring is not configured:&nbsp;

DaneA · Answer

Hi&nbsp;bfowler9024,

&nbsp;

Kindly try also&nbsp;to configure port mirroring before and&nbsp;after you have downgraded the firmware.&nbsp;&nbsp;Select port 26 as a source port on the&nbsp;M4100-26G-POE switch. &nbsp;Then, select another port(s) as a destination port on the M4100-26G-POE switch where a PC with Wireshark installed in it is directly connected. &nbsp;It would be best that Wireshark could capture the packets on the event the problem occurs from the source port.
&nbsp;
You may download Wireshark on this&nbsp;link. &nbsp;As reference guide, you may check this link I found online on how to use Wireshark. &nbsp;Once the problem recurs, download the packet capture to your PC.&nbsp;

&nbsp;

For the captured packets to be analyzed, open an online case with&nbsp;NETGEAR Support&nbsp;and state your concern. &nbsp;Attach&nbsp;the captured packets from Wireshark as well as the traffic graphs on the online case you have opened for it to be analyzed by the engineering team.