Sflow and hardware support, Sflow and cpu utilization, Sflow and source address – Brocade FastIron Ethernet Switch Administration Guide User Manual
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sFlow and hardware support
• Brocade devices support sFlow packet sampling of inbound traffic only. These devices do not
sample outbound packets. However, Brocade devices support byte and packet count statistics for
both traffic directions.
• sFlow is supported on all Ethernet ports (10/100, Gbps, and 10 Gbps)
sFlow and 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.
sFlow and 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.
NOTE
If an IP address is not already configured when you enable sFlow, the feature uses the source
address 0.0.0.0. To display the agent_address, enable sFlow, then enter the show sflow command.
Refer to the sections
on page 252 and
on
page 256.
NOTE
In sFlow version 5, you can set an arbitrary IPv4 or IPv6 address as the sFlow agent IP address. Refer
to
Specifying the sFlow agent IP address
sFlow and hardware support
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FastIron Ethernet Switch Administration Guide
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