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09-14-2015 02:00 AM
09-14-2015 02:00 AM
Hello,
we got a shiny new DL380 Gen 9 Server - Windows 2012R2 (Hyper-V Role) installed on it.
Networking through HP Ethernet 1Gb 4-port 331i Adapter.
Server is connected to ProCurve Switch 3400cl-48G through 4 Cables (NIC-Teaming) - had it conected with only 1 Cable before - got same Problem. (Server/Switch - all latest Firmware/Drivers)
Once in a while the Server loses Network Connectivity - physical Link stays up but the connection drops the Gateway ...
When querying the ARP-Cache on the Server it shows me:
Gateway-IP-Address 00-00-00-00-00-00 invalid
So it lost the MAC of the Gateway ... ?!?
When I plug out/in the Cable - all work's without problems again. (Can also just disable Switch-Port and re-enable it)
Already searched hours and hours for a solution - but didn't find anything ... Hope someone here can help me with this odd problem?!
Thank you
Andreas Schnederle-Wagner
Solved! Go to Solution.
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09-14-2015 02:24 AM
09-14-2015 02:24 AM
Re: DL380G9 - Network Troubles
some more Information:
cmd - NETSH INTERFACE IPv4 SHOW NEIGHBORS LEVEL=VERBOSE:
Nachbar 10.2.0.254
----------------------------------------------
Datenverbindungsadresse : 08-5b-0e-97-3b-0e
Status : Abgelaufen
Letzte Aktualisierung : 7
cmd - arp -a:
10.2.0.254 08-5b-0e-97-3b-0e dynamisch
Network still working - even it shows expired? Will output again when Network won't work anymore ...
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09-14-2015 08:26 AM - edited 09-14-2015 08:41 AM
09-14-2015 08:26 AM - edited 09-14-2015 08:41 AM
Re: DL380G9 - Network Troubles
alright - Network isn't working again ...
- 10.2.0.254 = Gateway IP
- 10.2.0.27 = Hyper-V Host
- 10.2.0.115 = Virtual Machine
- 10.2.1.14 = my Workstation
cmd - NETSH INTERFACE IPv4 SHOW NEIGHBORS
10.2.0.254 Nicht erreichbar Unvollständig
10.2.0.14 Nicht erreichbar Nicht erreichbar
10.2.0.115 00-15-d5-00-1b-00 Erreichbar
arp -av
10.2.0.254 08-5b-0e-97-3b-0e ungültig
10.2.0.14 2c-41-38-ba-de-c4 ungültig
10.2.0.115 00-15-d5-00-1b-00 dynamisch
all 4 physical Links are UP, NIC-Teaming also shows all 4 LOMs online
From my Workstation I can ping a Virtual Machine running on this Hyper-V Host but not the Hyper-V Host itself.
From within the Hyper-V Host I can also ping the Virtual Machine - but I can't ping my Workstation.
From within the virtual Machine I can ping everything - the Hyper-V Root Server, my Workstation and even the Internet ...
So only Network connectivity from Hyper-V Host is impacted.
Not really sure where to look for this Problem?!?!
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09-14-2015 09:05 AM
09-14-2015 09:05 AM
Re: DL380G9 - Network Troubles
some more information:
From switch:
ProCurve Switch 3400cl-48G# show arp
IP ARP table
IP Address MAC Address Type Port
--------------- ----------------- ------- ----
10.2.0.25 001e67-7ae2d4 dynamic Trk1
10.2.0.27 3ca82a-227980 dynamic 13
10.2.0.115 00155d-001b00 dynamic 14
10.2.0.254 085b0e-973b0e dynamic 1
10.2.1.11 b4b52f-cca2b3 dynamic 31
10.2.1.14 2c4138-badec4 dynamic 30
10.2.0.115 - the virtual machine which has full network connectivity is on Switch Port 14
10.2.0.27 - Hyper-V Root on Port 13
As soon as I disable Port 13 the NIC Teaming switches to another Switch Port and everything is working again.
But after a random Time the same behaviour also happens on another Switch-Port - so I guess it's not a faulty Switch-Port ...
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09-16-2015 03:15 AM - edited 09-16-2015 03:21 AM
09-16-2015 03:15 AM - edited 09-16-2015 03:21 AM
SolutionUpdate: Since I disabled VMQ/Large Send Offload V2 on all LOMs yesterday -no more Network Troubles ...
Executed those Commands for every LOM:
Set-NetAdapterAdvancedProperty "Embedded LOM 1" -DisplayName "Large Send Offload V2 (IPv4)" –DisplayValue Disabled
Set-NetAdapterAdvancedProperty "Embedded LOM 1" -DisplayName "vmq vlan filtering" –DisplayValue Disabled
Set-NetAdapterAdvancedProperty "Embedded LOM 1" -DisplayName "Virtual Machine Queues" –DisplayValue Disabled
What puzzles me a bit is that this known Broadcom+VMQ Problem should be solved with Broadcom Driver b57nd60a.sys Version 16,8 or higher as far as I know? (HP Changelog / Broadcom Driver Changelog)
Any ideas on this?
Andreas
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09-17-2015 12:56 AM
09-17-2015 12:56 AM
Re: DL380G9 - Network Troubles
Still no problems ... seems like Broadcom did not fix all Problems with VMQ in their Drivers ...
Will raise a Case with Broadcom.
Andreas
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