To avoid the back-off, either increase the global sampling rate or configure all the line card ports with the
desired sampling rate even if some ports have no sFlow configured.
Important Points to Remember
• The Dell Networking OS implementation of the sFlow MIB supports sFlow configuration using the
snmpset command.
• The Dell Networking OS exports all sFlow packets to the collector. A small sampling rate can equate
to many exported packets. A backoff mechanism is automatically applied to reduce this amount.
Some sampled packets may be dropped when the exported packet rate is high and the backoff
mechanism is about to or is starting to take effect. The dropEvent counter, in the sFlow packet, is
always zero.
• Community list and local preference fields are not filled in extended gateway element in the sFlow
datagram.
• 802.1P source priority field is not filled in extended switch element in sFlow datagram.
• Only Destination and Destination Peer AS number are packed in the dst-as-path field in extended
gateway element.
• If the packet being sampled is redirected using policy-based routing (PBR), the sFlow datagram may
contain incorrect extended gateway/router information.
• The source virtual local area network (VLAN) field in the extended switch element is not packed in
case of routed packet.
• The destination VLAN field in the extended switch element is not packed in a Multicast packet.
• On the MXL switch, up to 700 packets can be sampled and processed per second.
Enabling and Disabling sFlow
By default, sFlow is disabled globally on the system.
Use the following command to enable sFlow globally.
• Enable sFlow globally.
CONFIGURATION mode
[no] sflow enable

Enabling and Disabling sFlow on an Interface

By default, sFlow is disabled on all interfaces.
This CLI is supported on physical ports and link aggregation group (LAG) ports.
To enable sFlow on a specific interface, use the following command.
• Enable sFlow on an interface.
INTERFACE mode
[no] sflow enable
To disable sFlow on an interface, use the no version of this command.
sFlow 843