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Chapter 7
Configuring the Connection
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From the SCE(config if)# prompt, type
Step 1
[forwarding|bypass|sniffing|cutoff]
Configures the link mode for the specified link.
Configuring Asymmetric Routing Topology
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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, due to the fact that 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.
OL-7827-12
It is recommended that in cascaded topologies, both SCE platforms be configured for the same link
mode, otherwise the service will be unpredictable.
Sniffing can only be configured for all links, therefore, to configure sniffing, the all-links option is
required, not just recommended.
The default link mode is forwarding.
When other link modes are selected, active service control is not available and any service control
configuration will not be applicable.
Asymmetric Routing and Other Service Control Capabilities, page 7-8
Enabling Asymmetric Routing, page 7-8
How to Monitor Asymmetric Routing, page 7-8
linknumber
link mode [
|all-links]
and press Enter.
Cisco SCE 2000 and SCE 1000 Software Configuration Guide
Configuring Asymmetric Routing Topology
7-7
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