Link Mode - Cisco SCE 2000 4/8xFE Quick Start Manual

E 2
XAMPLE
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, and Link 0 would be connected to this SCE platform,
since Link 1 was connected to the primary. 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 2000(config if)# connection-mode inline-cascade physically-connected-links link-0
priority secondary on-failure bypass

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:
bypass
•
• forwarding
cutoff
•
sniffing
•
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.
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.
52