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Field Notice 70545
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Andreas Linde
Beginner

vmkernel interface has inherited the mac address of a physical NIC

Hi, over the past couple of years I've come across this bug on a few of my UCS installations:

https://tools.cisco.com/bugsearch/bug/CSCuf65032/?referring_site=bugquickviewredir

https://tools.cisco.com/bugsearch/bug/CSCuv00089/?referring_site=bugquickviewredir

Running ESXi we see random traffic flow issues between the host vmkernels and everytime this occur we can see that vmk Management PG has picked up a Cisco Mac address from the "physical" nic in UCS. Recreating vmk usually solves this problem.

My question is if there is any way to avoid this, several releases of UCS Software/firmware have passed as well as ESXi versions and the problem is still there. Anyone from Cisco in this forum who knows?

Regards

Andreas

1 REPLY 1
thomsonac
Enthusiast

Honestly I've never seen this with UCS and ESXi.  How have you set up the vNIC Templates for your ESXi hosts?  Have you added multiple vNICs for each fabric and NOT allowed fabric failover?  I've always allowed ESXi to handle it's own link failures rather than UCS (whereas I only add a single windows vNIC and allow fabric failover).

-Alex

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