This is a known issue affecting Emulex 10 Gb Nics with older firmware versions.
To resolve this issue, upgrade 10 Gb NIC firmware to version 4.6.166.6105 or later and must use BE2NET drivers of version 4.6.166.9 or later. Both are available from the hardware vendor.
To work around this issue, perform these preemptive actions:
- Ensure that Spanning Tree Protocol is enabled on upstream switches. For more information, see STP may cause temporary loss of network connectivity when a failover or failback event occurs (1003804).
- For IBM servers, enable Management Network Auto-Discovery (MCAD) in the BladeCenter AMM.
- Ensure your physical switch firmware is up-to-date. For IBM Blade servers, ensure the firmware of the Virtual Fabric Switch is up-to-date.