The 7750 SR and 7450 ESS AA ISA provides, for Layer 3 to Layer 7, packet processing used by the AA feature set. AA is applied to IPv4 and IPv6 traffic on a per-AA subscriber basis, where an AA subscriber is one of the following:
ESM subscriber
ESM-MAC subscriber (bridged residential/vRGW device)
distributed sub management (DSM) subscriber
SAP or spoke
transit
Non-IPv4 and IPv6 traffic is not diverted to AA and is forwarded as if AA was not configured; however, AA divert is supported for IP over PPPoE on Layer 2 (Epipe or VPLS) SAPs. An AA subscriber can be contained in the following services:
IES
VPLS
VLL (Epipe and Ipipe)
VPRN
AA is supported with:
bridged CO
routed CO
multi-homed COs
Layer 2/Layer 3 VPN service access points and spoke SDPs
The AA ISA feature set uses existing 7750 SR or 7450 ESS QoS capabilities and further enhances them to provide application-aware traffic reporting and management on per individual AA subscriber, AA subscriber-type or group. A few examples of per-application capabilities within the above AA subscriber contexts include:
per AA subscriber, application traffic monitoring and reporting
per application bandwidth shaping/policing/prioritization
throttling of flow establishment rate
limiting the number of active flows per application (such as BitTorrent, video or teleconference sessions, and so on)
application-level classification to provide higher or lower (including drop) level traffic management in the system (for example, IOM QoS) and network
The following restrictions are noted — AA is not supported for tunneled transit traffic (GRE or L2TP tunnels using PPP or DHCP based policy) destined for a remote BRAS.