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HP NIC Teaming and Not Receiving Echo Reply

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Dec 5th, 2011
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Hi all,

I am working with a strange problem at the minute with HP's NIC Teaming with Transmision Load Balancing.

We have a HP blade system the Server is connected to 2 cisco 3020's and then those 2 switches are connected to a 3750 Stack consisting of 2 Members.

Theres an LACP ether channel consisting of 4 Gigabit Ethernet Ports to each 3020 from the 3750 Stack.

They both have exactly the same configuration and all ports are up and the channel looks healthy.

When setting the Preference order on the server if I set the NIC connected to the 1st Cisco 3020 as primary i.e. Tx/Rx then everything is fine.

If I set the NIC Connected to the 2nd Cisco 3020 as primary then all seems fine i.e. I can ping it, it can access services outside its own vlan and the internet. It cannot however ping anything connected to the same subnet and VLAN on the 3750 Stack.

Doing a packet capture on a server connected to the VLAN on the 3750 stack I can see the Echo Requests coming in and the server sending an echo Reply but the echo reply never gets back to the server with the teamed NICs.

I did a Layer 2 traceroute and all looked fine, all the MAC Tables were good.

I thought maybe it was a layer 2 loop causing the problems but I have checked and re-checked STP and can't find any problems.

STP has picked up one intentional loop and blocked it.

I've raised a ticket with HP to see if they can point me in the right direction but I don't think it is a problem with there Drivers. It definately seems like a networking problem.

Can anyone give me any ideas on what to have a look at next.


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Reza Sharifi Mon, 12/05/2011 - 12:44
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The 3020s do not support stacking.  So, how do you create an Etherchannel using to separate 3020s?

Or the 3750 stack is only connected to one 3020?


kitbagtweaver Mon, 12/05/2011 - 15:45
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Hi Reza,

Sorry I meant to say there are 2 Ethernet Channels from the 3750 stack. One to each 3020.


Reza Sharifi Mon, 12/05/2011 - 16:17
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Ok, so you are not sharing one etherchannel between two  3020 switches

How are you connecting the 2 3020s together?


kitbagtweaver Mon, 12/05/2011 - 16:43
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No its 2 seperate channels to each 3020.

The 3020 themselves are not connected to each other.


kitbagtweaver Wed, 12/07/2011 - 15:48
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Another update it would appear when one NIC is classed as the active one i.e. Rx/Tx everything is fine.

If the other NIC is classed as the active one then we see the problems.

I can ping some hosts connected to the 3750 but not others.

But everything seems to be able to ping the Server that is having the problem.

I can't seem pinpoint the problem at all.

Has anyone got any tips on debugging Layer 2 issues?



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