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Nexus 1K VEM is Flapping very often and cost packet discard on VE

Unanswered Question
Mar 17th, 2012
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Hi All,


anyone aware of any reason the VEM on Nexus 1 k is flapping,

%PLATFORM-2-MOD_REMOVE: Module 1 removed (Serial number T5056B3041C)


log below keep on appear.

is already took more than 2 month, Cisco TAC and VM TAC, can't find any reason why the Virtual Ethernet Module is flapping?


PEN-NEXUS1KV-VA(config-monitor)# 2012 Mar 16 12:10:12.027 PEN-NEXUS1KV-VA %PLATFORM-2-MOD_REMOVE: Module 1 removed (Serial number T5056B3041C)

2012 Mar 16 12:10:51.037 PEN-NEXUS1KV-VA %PLATFORM-2-MOD_DETECT: Module 1 detected (Serial number :unavailable) Module-Type Virtual Supervisor Module Model :unavailable


PEN-NEXUS1KV-VA(config-monitor)#



THE VM is running on HP DL585 platform server with AMD prcessor

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Robert Burns Sat, 03/17/2012 - 04:57
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  • Cisco Employee,

There's not enough information to determine the reason by those two outputs alone.  All those commands tell us is the VSM is removing/attaching the VEM.


The normal cause for the VEM to flap is a problem with the Control VLAN communication.  The loss of 6 consecutive heart beats will cause the VEM to detach from the VSM.  We need to isolate the reason why.


-Which version of 1000v & ESX?

-Are multiple VEMs affected or just one?

-Are the VSM's interfaces hosted on the DVS or vSwitch?

-What is the network topology between the VEM and VSM (primarily the control VLAN)

-Do you have the Cisco SR # I can take a look into it.  TAC is your best course of action for an issue like this.  There will likely need to be live troubleshooting into your network environment to determine the cause.


Regards,


Robert

cheaseung Sun, 03/18/2012 - 19:05
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hi Robert ,


below are the details:


-Which version of 1000v & ESX?

version 4.2(1)SV1(4)                    ESX4.0 update 2


-Are multiple VEMs affected or just one?

Multiple VEMs affected


-Are the VSM's interfaces hosted on the DVS or vSwitch?

DVS


-What is the network topology between the VEM and VSM (primarily the control VLAN)

VEM and VSM using same L2 vlan and 4 hosts sitting on 1 pair of HSRP Cat6500 switches.



-Do you have the Cisco SR # I can take a look into it.  TAC is your best course of action for an issue like this.

SR 619927745



Remark:no packet dropped on all physical interface


thank you

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