Forum Discussion

Aspirant

Jul 01, 2017

Solved

GS110T/GS110TP Multicast overload bug

Hi, I have the following switches on a network, and they all suffer from this issue: 2x GS110T (v5.4.0.6 - latest?) 2x GS110TP (v5.4.2.30 - latest?) 1x GS110TP (v5.0.5.4) 1x GS110TP (v5.4...

JMSladen
Sep 21, 2017
Hi DaneA,

Sorry for the delay, I had been trying to make sure that everything was stable with the updated firmwares before updating.

As you say they were able to provide an updated firmware, that appears to be working fine for the GS110TP models.

for the GS110T switches I was given a work around from Engineering, which I will post below for anyone else who has this problem:

"The root cause is, the reserved range multicast packets comes to switch CPU and the IGMP application fowards them to other ports in same VLAN. Since, the packets are coming at high rate, CPU is becoming slow and failing to open GUI connection.

On GS110T, you can try installing an ACL and drop the multicast packets in the range 224.0.0.1 to 224.0.0.255. If you need these packets, then configure ACL with redirect action (redirect the matched packets to desired port)."

Cheers
James

JMSladen

Aspirant

Jul 12, 2017

Hi DaneA,

I believe I have tested the setup before with only the switches running the latest firmware, and the issue was the same.

I will test it again, but it will be next weekend the next time all the equipment is setup together.

Are there any other combinations that they would like proving, such as only GS110TP's, and leave the GS110T's and GS728TS out of the setup?

Are there any other samples that it would be useful for me to capture using wireshark, such as longer duration, or traces covering more of the switches, or showing attempts to use the GUI while the issue is occouring?

Cheers
James