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Catalyst 6500 Series Switch Command Reference—Release 8.4
OL-6244-01
Chapter 2 Catalyst 6500 Series Switch and ROM Monitor Commands
show fabric channel
The CEF256/CEF720 modules operate in one of three modes when using centralized forwarding:
• Compact mode—Operational mode when all modules in the system are CEF256 or CEF720 (no
non-fabric-enabled modules can be present for this mode).
In this mode, the CEF256 or CEF720 modules send a “compact” 32-byte header for each frame to
the supervisor engine over the switching bus. Once a forwarding decision is made, the CEF256 or
CEF720 modules send the entire frame through the switch fabric to the egress module.
• Truncated mode—Operational mode when at least one non-fabric-enabled module is present in the
system.
In this mode, the CEF256 or CEF720 modules send the first 64 bytes of each frame to the supervisor
engine over the switching bus. Once a forwarding decision is made, the CEF256 or CEF720 modules
send the entire frame through the switch fabric to the egress module.
• Flow-through mode—Operational mode for the CEF256 modules when there is no switch fabric present.
In this mode, the CEF256 modules send the entire packet to the supervisor engine over the switching bus.
This mode is not applicable for the CEF720 modules, which require the presence of the switch fabric.
Examples This example shows how to display fabric channel counter information for a specific module:
Console> show fabric channel counters 2
Channel 0 counters:
0 rxErrors = 0
1 txErrors = 0
2 txDropped = 0
Console>
This example shows how to display fabric channel utilization information:
Console> show fabric channel utilization
Fab Chan Input Output
-------- ----- ------
0 0% 0%
1 0% 0%
2 0% 0%
3 0% 0%
.
.
.
15 0% 0%
16 0% 0%
17 0% 0%
Console>