There could be a variety of reasons. what version of DFM is this? If you drill into this alert in the DFM Alerts and Activities Display, what does the underlying memory event say? What type of switch is this? What version of code is it running?
According to this, you only have 5.5% free memory. The default free memory threshold is 15%. If this is normal for this switch, and performance and operations are not be affected, you can increase the free memory threshold in DFM under DFM > Configuration > Polling and Thresholds > Managing Thresholds.
However, if this is not normal, you might want to ask on the LAN switching forum as to what you can do to isolate the memory problem.
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...