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How to Configure the Link Mode
About 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 four possible modes of operation:
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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.)
Options
The following link mode options are available:
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Recommendations and restrictions
Note the following recommendations and restrictions:
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Cisco SCE 2000 and SCE 1000 Software Configuration Guide
7-6
bypass
forwarding
cutoff
sniffing
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.
link# — the number of the link being configured
Use the all-links option to apply the configuration to all links
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:
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SCE 2000 4xGBE — GBE1-GBE2/GBE3-GBE4
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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.
Chapter 7
Configuring the Connection
OL-7827-12
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