User's Manual

Virtual Connect networks 102
Virtual Connect provides the ability to enable or disable port pause flood protection. The feature is enabled
by default and applies to all VC-Enet modules in the domain. Port pause floods are detected and server ports
can be disabled even prior to any enclosure being imported.
The default polling interval is 10 seconds and is not customer configurable. VC provides system logs and
SNMP traps for events related to pause flood detection. The SNMP agent supports trap generation when a
pause flood condition is detected or cleared.
Configuring Throughput Statistics
Telemetry support for network devices caters to seamless operations and interoperability by providing
visibility into what is happening on the network at any given time. It offers extensive and useful detection
capabilities which can be coupled with upstream systems for analysis and trending of observed activity.
The Throughput Statistics configuration determines how often the Throughput Statistics are collected and the
supported time frame for sample collection before overwriting existing samples. When the time frame for
sample collection is reached, the oldest sample is removed to allocate room for the new sample.
Configuration changes can be made without having to enable Throughput Statistics. Applying configuration
changes when Throughput statistics is enabled clears all existing samples.
Some conditions can clear existing Throughput Statistics:
• Disabling the collection of Throughput Statistics clears all existing samples.
• Changing the sampling rate clears all existing samples.
• Power cycling a VC-Enet module clears all Throughput Statistics samples for that module.
Collected samples are available for analysis on the Throughput Statistics screen (on page 233), accessible
by selecting Throughput Statistics from the Tools pull-down menu.
The following table describes the available actions for changing Throughput Statistics settings.
Task Action
Enable/disable
Select (enable) or clear (disable) the Enable Throughput Statistics checkbox.
Change sampling rate
Select a sampling rate from the Configuration list. Supported sampling rates
include:
•
Sample rate of 1 minute, collecting up to 5 hours of samples.
•
Sample rate of 2 minutes, collecting up to 10 hours of samples.
•
Sample rate of 3 minutes, collecting up to 15 hours of samples.
•
Sample rate of 4 minutes, collecting up to 20 hours of samples.
•
Sample rate of 5 minutes, collecting up to 25 hours of samples.
•
Sample rate of 1 hour, collecting up to 12.5 days of samples.
LACP timer configuration
Virtual Connect provides two options for configuring uplink redundancy (Auto and Failover). When the
connection mode is set to "Auto", VC uses Link Aggregation Control Protocol to aggregate uplink ports from
a Network or Shared Uplink Set into Link Aggregation Groups. As part of the LACP negotiation to form a
LAG, the remote switch sends a request for the frequency of the control packets (LACPDU). This frequency can
be "short" or "long." Short is every 1 second with a 3 second timeout. Long is every 30 seconds with a 90
second timeout.
Prior to VC 4.01 this setting defaulted to short. Starting with VC v4.01 this setting can be set to short or long.
The domain-wide setting can be changed on the Ethernet Settings (Advanced Settings) screen ("Ethernet