Dell BigIron RX Series, Configuration Manual

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BigIron RX Series Configuration Guide 1043
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Configuring sFlow
39
The < num > parameter specifies the average number of packets from which each sample will be
taken. The sampling rate you configure is the actual sampling rate. You can enter 512 –
2147483648. The default is 2048.
Changing the sampling rate on a port
You can configure an individual port to use a different sampling rate than the global default
sampling rate. This is useful in cases where ports have different bandwidths. For example, if you
are using sFlow on 10/100 ports and Gigabit Ethernet ports, you might want to configure the
Gigabit ports to use a higher sampling rate (and thus gather fewer samples per number of packets)
than the 10/100 ports.
To change the sampling rate on an individual port, enter a command such as the following at the
configuration level for the port.
BigIron RX(config-if-e10000-1/1)# sflow sample 8192
Syntax: [no] sflow sample < num >
The < num > parameter specifies the average number of packets from which each sample will be
taken. The software rounds the value you enter up to the next odd power of 2. The actual sampling
rate becomes one of the values listed in
“Changing the default sampling rate” .
Enabling sFlow forwarding
sFlow exports data only for the interfaces on which you enable sFlow forwarding. You can enable
sFlow forwarding on the Ethernet interfaces
To enable sFlow forwarding:
•
Globally enable the sFlow feature.
•
Enable sFlow forwarding on individual interfaces.
NOTE
Before you enable sFlow, make sure the device has an IP address that sFlow can use as its source
address. Refer to
“Source address” on page 1039 for the source address requirements.
NOTE
When you enable sFlow forwarding on an 802.1x-enabled interface, the samples taken from the
interface include the username used to obtain access to the inbound or outbound ports, if that
information is available. For information about 802.1x, refer to
Chapter 33, “Configuring 802.1x Port
Security” .
Enabling sFlow forwarding
To enable sFlow forwarding, enter commands such as the following.
BigIron RX(config)# sflow enable
BigIron RX(config)# interface ethernet 1/1 to 1/8
BigIron RX(config-mif-1/1-1/8)# sflow forwarding
These commands globally enable sFlow, then enable sFlow forwarding on Ethernet ports 1/1 –
1/8. You must use both the sflow enable and sflow forwarding commands to enable the feature.
Syntax: [no] sflow enable
Syntax: [no] sflow forwarding