Definitions for applications are under Networking > App Definitions: Applications.

Application definitions enable you to attach a business relevancy to all traffic that goes through your network. Appliances include many default definitions, which you can edit or add to as needed. Application groups help organize application definitions. For example, among the default groups you’ll find Business Standard, Business Critical, Business Video, Recreational, and so on.

Application definitions help to streamline appliance configuration. Within a definition, you specify parameters such as local and remote subnet addresses, transport and application layer protocols, VLAN tag ID, DSCP, whether the traffic is passed through or optimized, group and category, and business criticality. Application groups enable you to apply rules for multiple applications using just the group, avoiding the need to create separate rules for each individual application.

We strongly recommend that you define applications and push application definitions from a SteelCentral Controller for SteelHead to the managed appliances.

Enter the application traffic’s source subnet IP address and mask, or enter a predefined host label. You can enter wildcards all or 0.0.0.0/0 for all traffic.

If needed, enter a port number or predefined port label. Port ranges are allowed.

Same as for local subnet and port, except enter values for the application traffic’s destination.

Select a transport layer protocol. Default is All.

Enter an application layer protocol or an application definition.

VLAN v802.1Q is supported. Configure transport rules to apply to all VLANs or to a specific VLAN. By default, rules apply to all VLAN values unless you specify a particular VLAN ID. Pass-through traffic maintains any preexisting tagging between the LAN and WAN interfaces.

Optionally, specify a DSCP value from 0 to 63, or all to use all DSCP values.

Select Optimized, Passthrough, or All from the drop-down list. The default setting is All.

Business Bulk captures business-level file transfer applications and protocols, such as CIFS, SCCM, antivirus updates, and over-the-network backup protocols.

Business Critical captures business-level, low-latency transactional applications and protocols, such as SQL, SAP, Oracle and other database protocols, DHCP, LDAP, RADIUS, the Riverbed Control Channel (to identify and specify a DSCP value for out-of-band traffic), routing, and other network communication protocols.

Business Productivity captures general business-level productivity applications and protocols, such as email, messaging, streaming and broadcast audio/video, collaboration, intranet HTTP traffic, and business cloud services O365, Google apps, SFDC, and others through a white list.

Business Standard captures all intranetwork traffic going within local subnets as defined by the uplinks on the SteelHead. Use this class to define the default path for traffic not classified by other application groups.

Business VDI captures real-time interactive business-level virtual desktop interface (VDI) protocols, such as PC over IP (PCoIP), Citrix CGP and ICA, RDP, VNC, and Telnet protocols.

Business Video captures business-level video conferencing applications and protocols, such as Microsoft Lync and RTP video.

Business Voice captures business-level voice over IP (VoIP) applications and protocols (signaling and bearer), such as Microsoft Lync, RTP, H.323 and SIP.

Recreational captures all Internet-bound traffic that has not already been classified and processed by other application groups.

Standard Bulk captures general file transfer protocols, such as FTP, torrents, NNTP/usenet, NFS, and online file hosting services Dropbox, Box.net, iCloud, MegaUpload, Rapidshare, and others.

Custom Applications captures user-defined applications that have not been classified into another application group.

Lowest criticality specifies the lowest priority service class.

Low criticality specifies a low-priority service class (for example, FTP, backup, replication, other high-throughput data transfers, and recreational applications such as audio file sharing).

Medium criticality specifies a medium-priority service class.

High criticality specifies a high-priority service class.

Highest criticality specifies the highest priority service class.

These are minimum service class guarantees; if better service is available, it’s provided. The service class describes only the delay sensitivity of a class, not how much bandwidth it’s allocated. Typically, you set low priority for high-throughput, non packet-delay sensitive applications like FTP, backup, and replication.

Reference: Application Signatures for AFE