Cache Entry Exists

Cache Entry Exists
When frames destined for an MLS-RP MAC address enter the switch, the switch checks whether
a cache entry has been made that matches the attributes of the current packet.
As was previously mentioned, each frame has distinguishing characteristics or attributes that
enable the MLS-SE to categorize a packet into a flow. For instance, all packets from a particular
IP address and destined for a different IP address can be placed by a switch into a flow. A flow
entry can use IP addresses as well as, optionally, layer 4 information. The MLS-SE uses these cache
attributes to match header information in future incoming packets. If an incoming packet has the
same attributes as an established flow cache entry, the packet is layer 3- or shortcut-switched.