Some of the BIG-IP Local Traffic Manager profiles that you can configure are known as protocol profiles. The protocol profiles types are:
For each protocol profile type, Local Traffic Manager provides a pre-configured profile with default settings. In most cases, you can use these default profiles as is. If you want to change these settings, you can configure protocol profile settings when you create a profile, or after profile creation by modifying the profile’s settings.
To configure and manage protocol profiles, log in to the BIG-IP Configuration utility, and on the Main tab, expand Local Traffic, and click Profiles.
The purpose of a Fast L4 profile is to help you manage Layer 4 traffic more efficiently. When you assign a Fast L4 profile to a virtual server, the Packet Velocity ASIC (PVA) hardware acceleration within the BIG-IP system (if supported) can process some or all of the Layer 4 traffic passing through the system. By offloading Layer 4 processing to the PVA hardware acceleration, the BIG-IP system can increase performance and throughput for basic routing functions (Layer 4) and application switching (Layer 7).
You can use a Fast L4 profile with these types of virtual servers: Performance (Layer 4), Forwarding (Layer 2), and Forwarding (IP).
Once you implement a Fast L4 profile, Local Traffic Manager automatically selects the most efficient PVA hardware acceleration mode for Layer 4 traffic, if PCVA is supported on the specific BIG-IP platform. Possible modes are Full, Assisted, and None.
The particular hardware acceleration mode that Local Traffic Manager selects depends on these factors:
Depending on the current mode to which hardware acceleration is automatically set, Local Traffic Manager accelerates Layer 4 traffic
The Fast HTTP profile is a configuration tool designed to speed up certain types of HTTP connections. This profile combines selected features from the TCP Express, HTTP, and OneConnect profiles into a single profile that is optimized for the best possible network performance. When you associate this profile with a virtual server, the virtual server processes traffic packet-by-packet, and at a significantly higher speed.
You might consider using a Fast HTTP profile when:
A significant benefit of using a Fast HTTP profile is the way in which the profile supports connection persistence. Using a Fast HTTP profile ensures that for client requests, Local Traffic Manager can transform or add an HTTP Connection header to keep connections open. Using the profile also ensures that Local Traffic Manager pools any open server-side connections. This support for connection persistence can greatly reduce the load on destination servers by removing much of the overhead caused by the opening and closing of connections.
When writing iRules, you can specify a number of events and commands that the Fast HTTP profile supports.
You can use the default fasthttp profile as is, or create a custom Fast HTTP profile.
The UDP profile is a configuration tool for managing UDP network traffic.
Because the BIG-IP system supports the OpenSSL implementation of datagram Transport Layer Security (TLS), you can optionally assign both a UDP and a Client SSL profile to certain types of virtual servers.
Local Traffic Manager includes a profile type that you can use to manage Stream Control Transmission Protocol (SCTP) traffic. Stream Control Transmission Protocol (SCTP) is a general-purpose, industry-standard transport protocol, designed for message-oriented applications that transport signalling data. The design of SCTP includes appropriate congestion-avoidance behavior, as well as resistance to flooding and masquerade attacks.
Unlike TCP, SCTP includes the ability to support several streams within a connection. While a TCP stream refers to a sequence of bytes, an SCTP stream represents a sequence of messages.
You can use SCTP as the transport protocol for applications that require monitoring and detection of session loss. For such applications, the SCTP mechanisms to detect session failure actively monitor the connectivity of a session.