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Cisco SCE8000 GBE Installation and Configuration Guide
OL-19897-02
Chapter 6 Cabling the GBE Line Ports and Completing the Installation
Cascaded Systems
EXAMPLE 1
Use the following command to configure the primary SCE platform in a two-SCE8000 GBE platform
inline topology. The behavior of the SCE platform if a failure occurs is bypass.
SCE(config if)# connection-mode inline-cascade sce-id 0 priority primary on-failure bypass
EXAMPLE 2
Use the following command to configure the SCE platform that might be cascaded with the SCE
platform in Example 1. This SCE platform would have to be the secondary SCE platform. The
connection mode would be the same as the first, and the behavior of the SCE platform if a failure occurs
is also bypass.
SCE(config if)# connection-mode inline-cascade sce-id 1 priority secondary on-failure
bypass
How to Set the Link Mode
The SCE platform has an internal hardware card used to maintain the links even when the SCE platform
fails. This hardware card has three possible modes of operation:
• bypass
• forwarding
• cutoff
Normally, the link mode is selected by the SCE platform software according to the configured
connection-mode. However, the link mode command can be used to enforce a specific desired mode.
This may be useful when debugging the network, or in cases where we would like the SCE platform just
to forward the traffic. (Note that this is only relevant to inline topologies even though the configuration
is available also when in receive-only mode.)
The following link mode options are available:
• Forwarding — forwards traffic on the specified link to the SCE platform for processing.
• Bypass — stops all forwarding of traffic on the specified link to the SCE platform. Traffic still flows
on the link, but is not processed in any way by the SCE platform.
This does not affect the redundancy states.
• Cutoff — completely cuts off flow of traffic through the specified link.
Note the following recommendations and restrictions:
• Link mode is relevant only to inline topologies.
• It is recommended that in cascaded topologies, both SCE platforms be configured for the same link
mode, otherwise the service will be unpredictable.
• 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.
Step 1 From the SCE (config if)# prompt, type link mode [forwarding|bypass|cutoff] and press Enter.
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