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Cisco SCE 2000 4xGBE Installation and Configuration Guide
OL-7824-06
Chapter 6 Cabling the Line Ports and Completing the Installation
Information About Cascaded Systems
• cutoff
• sniffing
Normally, the link mode is selected by the SCE platform software according to the configured
connection-mode. However, the link-modecommand 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.
• Sniffing — allows the SCE platform to forward traffic on the specified link through the bypass
mechanism while still analyzing the traffic passively.
Sniffing is permitted to be configured for all links, only (use the all-links option).
• Cutoff — completely cuts off flow of traffic through the specified link.
Note the following recommendations and restrictions:
• Since the SCE 1000 platform has only one link, the link is not specified.
• Since the SCE 2000 platforms have more than one link, it is required to specify the link. The link
designations are different for the GBE and FE platforms, as follows:
–
SCE 2000 4xGBE — GBE1-GBE2/GBE3-GBE4
–
SCE 2000 4/8xFE — LINK1/LINK2
• Use the ' all-links' option to configure the link mode for all links (SCE 2000 platforms only).
• 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 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.
Step 1 From the SCE 2000 (config if)# prompt, type link-mode [<link>|all-links]
[forwarding|b ypass|sniffing|cutoff] and press Enter.
Monitoring the System
Use the following commands to view the current connection mode and link mode parameters.
• How to View the Current Connection Mode
• How to View the Current Link Mode
• How to View the Current Link Mappings
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