Dell C9000 Series Reference Manual page 730

Command History
Version
9.9(0.0)
9.7(0.0)
9.3(0.0)
Usage Information When you enter the instance all option, show hardware stack-unit unit-number
buffer-stats-snapshot unit 0 resource X output for all available instances on the history
collection is displayed.
When you enter the instance id option, show hardware stack-unit unit-number
buffer-stats-snapshot unit 0 resource X for specified instance alone is displayed.
When you enter the summaryoption, show hardware stack-unit stack-unit-number
buffer-stats-snapshot unit 0 resource X will be enhanced to display the total buffered
cells, shared cells, headroom cells for last 5 instances in the table format.
If information for specified instance id is not available when you enter the show command, which
occurs if you issue the command before the time elapsed for the snapshot to be captured for that
instance ID, the following informational message is displayed on the console:%Info: Data for
instance id id is not available.
If information for specified instance id id is not available when you enter the show command,
which occurs if you issue the command before the time elapsed for the snapshot to be captured
for that instance ID, the following informational message is displayed on the console:%Info:
Data for instance id id is not available.
For example, if you configured 5 as the maximum instances with linear periodicity and a polling
interval of 10 seconds, 1 as the multiplier, then 5 instances will be polled at 10, 20, 30, 40, and 50
seconds incrementally. If you attempt to enter the show command to display the fifth instance
after 30 seconds of enabling polling, the aforementioned information message is shown.
If specified instance ID is higher than the size of the maximum number of snapshot instances
configured, the following error message is displayed on the console:%Error: Instance Id is
not valid. Configured max snapshot instances are <max-instances>
If you configured the maximum number of instances as 5 and attempt to view the buffer statistics
tracking details for the instance ID of 6, the aforementioned error is shown.
In the following example, the Headroom Cells field indicates the amount of shared buffer area that
is allocated to store packets that are received after the pause frame is received or a priority-based
flow control pause frame is enabled. When an inbound interface halts the sending of traffic, it
must have the buffer space to save all of the packets currently in the buffer, and also all of the
packets that were received before the device stops the sending of packets. Headroom space is
used for high-priority traffic that needs to be queued and preserved above the input queue limit,
such as keepalives and hello messages.
Description
Introduced on the C9010.
Introduced on the S6000-ON.
Introduced on the S6000 platform.
Data Center Bridging (DCB) 730