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EXAMPLE 2
Use the following command to configure the SCE 2000 that might be cascaded with the SCE 2000 in Example 1. This
SCE 2000 would have to be the secondary SCE 2000, and Link 0 would be connected to this SCE 2000, since Link 1 was
connected to the primary. The connection mode would be the same as the first, and the behavior of the SCE 2000 if a
failure occurs is also bypass.
SCE 2000(config if)# connection-mode inline-cascade physically-connected-links link-0
priority secondary on-failure bypass
Link Mode
The SCE 2000 has an internal hardware card used to maintain the links even when the SCE 2000 fails. This hardware
card has four possible modes of operation:
• bypass
• forwarding
• cutoff
• sniffing
Normally, the link mode is selected by the SCE 2000 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 2000 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 2000 for processing.
• Bypass: stops all forwarding of traffic on the specified link to the SCE 2000. Traffic still flows on the link, but is not
processed in any way by the SCE 2000.
This does not affect the redundancy states.
• Sniffing: allows the SCE 2000 to forward traffic on the specified link through the bypass mechanism while still
analyzing the traffic passively.
• Cutoff: completely cuts off flow of traffic through the specified link.
Note the following recommendations and restrictions:
• It is recommended that both links be configured together. Use the all-links option.
• Link mode is relevant only to inline topologies.
• It is recommended that in cascaded topologies, both SCE 2000s 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.