Unknown Issues with DAC10G-1M and XGS2220-54HP and XMG1915-18EP

GiuseppeR

Hello everyone,

I spent some hours trying to understand why I had issues using 2x DAC10G-1M to connect those 2 switches.

I have two switches:

• MainSwitch
• AP+FW

I have a USG Flex that is my FW linked to "AP+FW" (multigigabit switch) that I would like to link via LACP with 2x DAC10G-1M to "MainSwitch"

So I prepared the LACP on 17+18 ports on "AP+FW" and 53+54 on "MainSwitch".

Connecting both DAC the result was the network went offline.

Switch went in recovery, I saw errors in pkts.

Splitting the LACP I see the port 17:

I see also port 18:

So I looked into port scheme and I saw the STP blocking:

I looked into specific graphic and I saw the issues:

I decided to test the DACs separately.

DAC1:

• from 18 to 54 on "MainSwitch"
• from 17 to 54 on "MainSwitch"

I saw on port 18 errors RX CRC 25578 pkts while port17 went to 650.

I tried the same fibre from 17 to 52 on "MainSwitch" and I reached errors CRC 4201 pkts.

DAC2:

• from 18 to 52 no blue led
• from 18 to 54 goes blue led but I saw RX CRC up to 25584 pkts
• from 17 to 54 and I saw RX CRC to 4252 pkts

During these 3 hours everything inside the network went offline, NASes, servers an so on including other Zyxel switches that were linked to "MainSwitch".

At the end I linked with RJ45 from 16 to 50 and everything went online again almost instantly.

That seems strange to me because DAC10 is a 10 Gigs fiber with SFP+ compatible with both brand spanking new switches.

Zyxel_Judy

Hi @GiuseppeR ,

Could you please configure the Media type as "DAC 10G" for the following ports and test again?

• Ports 17 and 18 on the "AP+FW"
• Ports 53 and 54 on the "MainSwitch"

If you've followed the above recommendation and the issue persists, please enable Zyxel support.

Additionally, please provide us with the name of your Nebula organization/site here or via the private message by clinking to my account > Message.

Zyxel_Judy

Hi @GiuseppeR ,

I never used to set DAC10G when using DACs, is it necessary also on premise or it is something related to Nebula?

When connecting a DAC10G cable to an SFP+ port, please set the Media Type to "DAC 10G" in either Nebula or Standalone mode.

Could you share whether the issue is resolved after you changed to Media Type to "DAC 10G"?

I see that you forced Link speed:

Setting it to "Auto" is also sufficient. Please disregard the Link setting shown in my screenshot, as it's not relevant to your DAC10G configuration.

GiuseppeR

Hello @Zyxel_Judy

what you suggested me was perfect:

For everyone else this is the guide to have 20 Gbps teaming network link:

• set "media type" for the ports where you want to use DAC10G cables (you will NOT be able to do that after LACP aggregation)
• test each port without LACP
• unplug the DAC10G and link both switches with RJ45 uplink
• set the LACP group on each side of the network
• wait for "Up to date" notification on the side of the switch name
• plugin both DAC10G

Enjoy

Zyxel_Judy

Hi @GiuseppeR ,

Could you please configure the Media type as "DAC 10G" for the following ports and test again?

• Ports 17 and 18 on the "AP+FW"
• Ports 53 and 54 on the "MainSwitch"

If you've followed the above recommendation and the issue persists, please enable Zyxel support.

Additionally, please provide us with the name of your Nebula organization/site here or via the private message by clinking to my account > Message.

GiuseppeR

Hello @Zyxel_Judy

I never used to set DAC10G when using DACs, is it necessary also on premise or it is something related to Nebula?

I need to know that because this is the first installation with DACs in Nebula, so I can rearrange future installations.

I see that you forced Link speed:

Is it mandatory?

Zyxel_Judy

Hi @GiuseppeR ,

I never used to set DAC10G when using DACs, is it necessary also on premise or it is something related to Nebula?

When connecting a DAC10G cable to an SFP+ port, please set the Media Type to "DAC 10G" in either Nebula or Standalone mode.

Could you share whether the issue is resolved after you changed to Media Type to "DAC 10G"?

I see that you forced Link speed:

Setting it to "Auto" is also sufficient. Please disregard the Link setting shown in my screenshot, as it's not relevant to your DAC10G configuration.

GiuseppeR

Hello @Zyxel_Judy

I have just changed the configuration to "DAC 10G" for 4x ports: 17+18 and 53+54

Now I see "Up to date" for all 6x switches.

I have to wait about 5-6 hours to reach the installation to insert fiber cables and check them.

In any case I'll update this thread to let you know the results; if I remove RJ45 and replace it with a single DAC and it will work I'm going to try also LACP link to have 20 Gbps.

See you soon, have a nice day

GiuseppeR

Hello @Zyxel_Judy

what you suggested me was perfect:

For everyone else this is the guide to have 20 Gbps teaming network link:

• set "media type" for the ports where you want to use DAC10G cables (you will NOT be able to do that after LACP aggregation)
• test each port without LACP
• unplug the DAC10G and link both switches with RJ45 uplink
• set the LACP group on each side of the network
• wait for "Up to date" notification on the side of the switch name
• plugin both DAC10G

Enjoy