Brocade BigIron RX Series Configuration Guide - Manual (Page 1204)

1126 BigIron RX Series Configuration Guide
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sFlow overview
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NOTE
The device uses the router ID only if the device also has an IP interface with the same address.
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
“Enabling sFlow forwarding” on page 1129 and “Displaying sFlow information” on
page 1133.
NOTE
If you change the address sFlow will use for the agent_address, you must disable and re-enable
sFlow to enable the feature to use the changed address.
NOTE
sFlow does not export packets through the management port.
NOTE
sFlow does not use the management IP as the agent IP.
Sampling rate
The sampling rate is the average ratio of the number of packets incoming on an sflow enabled port,
to the number of flow samples taken from those packets. Device ports send only the sampled
traffic to the CPU. sFlow sampling requires high LP CPU usage, which can affect performance in
some configurations especially if a high sampling rate is implemented.
Inbound port monitoring
You can enable Inbound port monitoring or sFlow on ports that use the same packet processor.
However, you cannot enable both features on ports that use the same packet processor.
Extended router information
Extended router information contains information for the next hop router. This information includes
the next hop router’s IP address and the outgoing VLAN ID. Extended router information also
includes the source IP address prefix length and the destination IP address prefix length.
Note that in IPv4, prefix length of source and destination IP addresses is collected only if BGP is
configured on the devices.
Extended gateway information
Extended gateway information is included in an sFlow sampled packet if BGP is enabled. The
extended gateway information includes the following BGP information about the packet’s
destination route:
• This router’s autonomous system (AS) number
• The route’s source IP AS
• The route’s source peer AS
• The AS path to the destination