Dell FCX624-E Laptop User Manual


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PowerConnect B-Series FCX Configuration Guide 1429
53-1002266-01
sFlow
A
Configuration considerations
This section lists the sFlow configuration considerations on Dell PowerConnect devices.
PowerConnect B-Series FCX devices, you can use QoS queue 1 for priority traffic, even when sFlow
is enabled on the port.
If an PowerConnect B-Series FCX stack is rebooted, sFlow is disabled on standby and member
units until the configuration is synchronized between the Active and Standby Controllers.
Hardware support
Dell PowerConnect devices support sFlow packet sampling of inbound traffic only. These
devices do not sample outbound packets. However, Dell PowerConnect devices support byte
and packet count statistics for both traffic directions.
sFlow is supported on all Ethernet ports (10/100, Gbps, and 10 Gbps)
CPU utilization
Enabling sFlow may cause a slight and noticeable increase of up to 20% in CPU utilization. In
typical scenarios, this is normal behavior for sFlow, and does not affect the functionality of other
features on the switch.
Source address
The sampled sFlow data sent to the collectors includes an agent_address field. This field identifies
the IP address of the device that sent the data:
On a Layer 2 Switch, agent_address is the Layer 2 Switch management IP address. You must
configure the management IP address in order to export sFlow data from the device. If the
switch has both an IPv4 and IPv6 address, the agent_address is the IPv4 address. If the switch
has an IPv6 address only, the agent_address is the global IPv6 address.
On a Layer 3 Switch with IPv6 interfaces only, sFlow looks for an IPv6 address in the following
order, and uses the first address found:
The first IPv6 address on the lowest-numbered loopback interface
The first IPv6 address on the lowest-numbered VE interface
The first IPv6 address on any interface
On a Layer 3 Switch with both IPv4 and IPv6 interfaces, or with IPv4 interfaces only, sFlow
looks for an IP address in the following order, and uses the first address found:
The IPv4 router ID configured by the ip router-id command
The first IPv4 address on the lowest-numbered loopback interface
The first IPv4 address on the lowest-numbered virtual interface
The first IPv4 address on any interface
NOTE
The device uses the router ID only if the device also has an IP interface with the same address.
Router ID is not supported on IPv6 devices.