01-22-2013 11:34 AM - edited 03-01-2019 10:50 AM
I got 3 esxi 5.1 servers setup each with 2 vmk nics - vmk1, vmk2
vmk1 is on fabA
vmk2 is on fabB
the chassis is connected to the FI, and from the FI, its going directly to the nexus 7k core. Jumbo frames is enabled on the core switches.
I have CoS of Gold for vmotion and a Qos Policy of gold with defaults shown.
the problem is from each esxi host, when I try to vmkping (vmkping -s 8000 vmk1 or vmk2 ip) the vmk2 of another esxi host, it does not respond. but vmk1 does.
I checked my vmnic polices and templates especially on fabB and they are all set to 9000.
any ideas here?
on the local esxi host itself, I can ping both vmk1 and vmk2
Solved! Go to Solution.
01-30-2013 06:27 AM
Tony,
One of the things to keep in mind is that traffic from FI-A to FI-B transits the upstream Layer 2 network. Check that the LAN switches to which you uplink also have jumbo frames enabled.
David
01-22-2013 11:46 AM
Since it works with one vmk and not the other, it's likely a host issue.
Check your vSwitch MTU and VMK MTU on the OS. You can do this from vCenter - Host - Networking.
or from the CLI:
esxcfg-vmknic -l
esxcfg-vswitch -l
Regards,
Robert
01-22-2013 02:54 PM
they are all showing mtu at 9000. not sure where else to look. seems to be fabB related but I cannot find anything there
01-26-2013 05:02 PM
i can ping the vmk intefaces across esxi hosts on the same FI only with jumbo packets.
when i try to vmkping any vmk intefaces with jumbo size packets on FI-B across esxi hosts, it fails.
I verified this by removing the physical nic on the exi host attached to FI-B so that both vmk interfaces are pinned to FI-A and it works.
01-30-2013 06:27 AM
Tony,
One of the things to keep in mind is that traffic from FI-A to FI-B transits the upstream Layer 2 network. Check that the LAN switches to which you uplink also have jumbo frames enabled.
David
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