Download Brocade Communications Systems BR-1020 Troubleshooting guide

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Ethernet network interface problems (CNA only)
Action: Check for other instances of this diagnostic using ps -ef for Linux and VMware, and Task
Manager for Windows systems.
Action: Wait a few minutes before retrying the command (Check if the other instance is done
using ps -ef command or Task Manager).
5. Symptom: The loopback test returns “Missing frame check and replace SFP/cable.”
Possible Cause: The loopback cable was pulled during the test.
NOTE
This should only occur when the test is run in ext mode and not in serdes mode.
Action: Restart the test with the cable connected.
Network stack runs out of heap
The network stack on VMware systems is running out of heap space.
Possible Cause: Enabling NetQueue and using jumbo frames has caused the network stack to run
out of heap with default values set for netPktHeapMaxSize and netPktHeapMinSize. Leaving
default values can result in unpredictable behavior.
Action: Perform the following steps.
1. Log in to the VI Client.
2. Click the Configuration tab for the ESX Server host.
3. Click Advanced Settings.
4. Click VMkernel.
5. Find the corresponding value field for VMkernel.Boot.netPktHeapMaxSize, and enter 128 .
6. Find the corresponding value field for VMkernel.Boot.netPktHeapMinSize, and enter 32 .
7.
Click OK to save the changes.
8. Reboot the system.
NIC numbering unexpected on VMware systems
After installing CNA drivers on VMware systems, NIC numbering is not what is normally expected.
For example, instead of vmnic32 or vmnic33, number is vmnic2 and vmnic3.
Possible Cause: CNA hardware was installed before drivers.
Action: When installing a CNAs on a VMware systems, it is advisable to install the driver before the
CNA cards so that the NICs will be properly enumerate in the system. To resolve the problem, you
must perform the following steps:
1. Uninstall the drivers.
2. Remove the CNA card.
3. Reboot your system without the CNA.
4. Install the drivers.
5. Install the card.
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Brsocade Adapters Troubleshooting Guide
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