Layer 4 Session Table
The Layer 4 session provides a fast path for forwarding packets. A session is an entry that contains complete Layer 3 and Layer 4 information for a flow of traffic. Layer 3 information includes the source and destination IP addresses. Layer 4 information includes the source and destination TCP and UDP ports. For comparison, the IP forwarding cache contains the Layer 3 destination address but does not contain the other source and destination address information of a Layer 4 session table entry.
The Layer 2 switch or Layer 3 switch selects the session table instead of the IP forwarding table for fast-path forwarding for the following features:
To increase the size of the session table, refer to "Displaying and modifying system parameter default settings" in the Brocade FastIron Layer 2 Switching Configuration Guide. The ip-qos-session parameter controls the size of the session table.