Asymmetric Routing Topology; Asymmetric Routing And Other Service Control Capabilities - Cisco SCE 8000 Installation And Configuration Manual

Asymmetric Routing Topology

Asymmetric Routing Topology
In some Service Control deployments, asymmetrical routing occurs between potential service control
insertion points. Asymmetrical routing can cause a situation in which the two directions of a
bi-directional flow pass through different SCE platforms, resulting in each SCE platform seeing only one
direction of the flow (either the inbound traffic or the outbound traffic).
This problem is typically solved by connecting the two SCE platforms in cascade mode (or through an
MGSCP cluster), thereby making sure that both directions of a flow run through the same SCE platform.
However, this is sometimes not feasible, because the SCE platforms sharing the split flow are
geographically remote (especially common upon peering insertion). In this type of scenario, the
asymmetric routing solution enables the SCE platform to handle such traffic, allowing SCA BB to
classify traffic based on a single direction and to apply basic reporting and global control features to
uni-directional traffic.

Asymmetric Routing and Other Service Control Capabilities

Asymmetric routing can be combined with most other Service Control capabilities; however, there are
some exceptions.
Service Control capabilities that cannot be used in an asymmetric routing topology include the
following:
•
•
•
Cisco SCE8000 GBE Installation and Configuration Guide
3-16
Subscriber redirect.
Subscriber notification.
Any kind of subscriber integration. (Use subscriber-less mode or anonymous subscriber mode
instead.)
Chapter 3 Cisco SCE 8000 Topology and Topology-Related Parameters