Symptoms or Error
NetScaler VPX loses network connectivity intermittently on VMware ESXi after upgrading to version 12.0.
The following are the symptoms of this issue:
- Interface will start flapping followed by the network connectivity being lost
- Interfaces on VPX will NOT show DOWN or HANG or STALL
- RESET interface or reboot of the NetScaler will bring the connectivity back for few minutes
- Adapter type on VMware is E1000
Solution
This is a known issue and will be fixed in the following NetScaler releases:
12.0 Build 51.x
11.1 Build 55.x
11.0 Build 71.x
Workaround
Complete the following steps to workaround this issue:
- Remove all the E1000 interfaces.
Note: Not just disconnect interfaces but all the E1000 interfaces. - Change the adapter type from E1000 to VMXNET3 VMware ESXi.
- Ensure to use the same MAC address as mentioned in the license to avoid license re-allocation. If using the same MAC address does not help with license, then re-allocation of license is required.
Problem Cause
Rx ring was cleaned completely as a part of every reset which is not in sync with backends expectation.