Symptoms

Table of Contents: 1. Affected Platforms2. Affected Firmware3. Description4. Customer Impact5. Workaround6. Fix Affected Platforms Dell IO modules IO-Aggregator or MXL Affected Firmware All software releases Description Upon failover of the active server links "FROM" one Dell IO-Aggregator stack "TO" another DellIO-Aggregator stack, a connectivity loss of 20 minutes can be observed between the VMware servers and their Default Gateway. The connectivity loss only occurs when the "TO" stack is not in a stable state, for example if there has been an uplink po 128 shutdown on the "TO" stack (shut, followed by no shut) in the last 20 minutes before the failover. The IO-Aggregator stack will drop incoming packets while the programming of the physical ports into the vlans is taking place. If the stacks are in a stable state, the connectivity loss during failover is only a few seconds which is the amount of time for the VMware server to detect link down and start forwarding packets to the newly active link. Customer Impact 20 minutes connectivity loss upon failing over the active server links to an IO-Aggregator or MXL stack which is not in a stable state. Work Around When performing upgrades and maintenance activities, allow 20 minutes for the destinationIO-Aggregator or MXL stack to stabilize before failing over server’s active links to it. The 20 minutescount should start from the time when the server ports are seen in operational UP state using the "show interface status" command. Reducing the number of configured vlans on each physical interface will reduce the amount of time needed to program the interfaces into the vlans. Fix This is design intent, not a software defect, and a fix is not expected.

Support Cases