sFlow | 843• FTOS exports all sFlow packets to the collector. A small sampling rate can equate to a large number ofexported packets. A backoff mechanism will automatically be applied to reduce this amount. Somesampled packets may be dropped when the exported packet rate is high and the backoff mechanism isabout to or is starting to take effect. The dropEvent counter, in the sFlow packet, will always be zero.• Community list and local preference fields are not filled in extended gateway element in sFlowdatagram.• 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 extendedgateway element• If packet being sampled is redirected using PBR (Policy-Based Routing), sFlow datagram may containincorrect extended gateway/router information.• Source VLAN field in the extended switch element will not be packed in case of routed packet.• Destination VLAN field in the extended switch element will not be packed in case of Multicast packet.• On the S-Series, up to 700 packets can be sampled and processed per second.• On the C-Series up to 1000 packets can be sampled and processed per second.• On the E-Series, the maximum number of packets that can be sampled and processed per second is:— 7500 packets when no extended information packing is enabled.— 1000 packets when only extended-switch information packing is enabled.— 1600 packets when extended-router and/or extended-gateway information packing isenabled.Enable and Disable sFlowBy default, sFlow is disabled globally on the system. To enable sFlow globally, use the sflow enablecommand in CONFIGURATION mode. Use the no version of this command to disable sFlow globally.Enable and Disable on an InterfaceBy default, sFlow is disabled on all interfaces. To enable sFlow on a specific interface, use the sflowenable command in INTERFACE mode. Use the no version of this command to disable sFlow on aninterface. This CLI is supported on physical ports and LAG ports.Command Syntax Command Mode Usage[no] sflow enable CONFIGURATION Enable sFlow globally.Command Syntax Command Mode Usage[no] sflow enable INTERFACE Enable sFlow on an interface.
