Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 676
Back-off Mechanism, sFlow on LAG ports, Extended sFlow
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www.dell.com | support.dell.com Back-off Mechanism If the sampling rate for an interface is set to a very low value, the CPU can get overloaded with flow samples under high-traffic conditions. In such a scenario, a binary back-off mechanism gets triggered, which doubles the sampling-rate (halves the number of samples per second) for all interfaces. The backoff mechanism continues to double the sampling-rate until CPU condition is cleared. This is as per sFlow version 5 draft. Once the back-off changes the sample-rate, users must manually change the sampling rate to the desired value. As a result of back-off, the actual sampling-rate of an interface may differ from its configured sampling rate. The actual sampling-rate of the interface and the configured sample-rate can be viewed by using the show sflow command. sFlow on LAG ports When a physical port becomes a member of a LAG, it inherits the sFlow configuration from the LAG port. Extended sFlow e Extended sFlow is supported fully on platform c s Platforms and support extended-switch information processing only. Extended sFlow packs additional information in the sFlow datagram depending on the type of sampled packet. The following options can be enabled: • extended-switch - 802.1Q VLAN ID and 802.1p priority information • extended-router - Next-hop and source and destination mask length. • extended-gateway - Source and destination AS number and the BGP next-hop. Note: The entire AS path is not included. BGP community-list and local preference information are not included. These fields are assigned default values and are not interpreted by the collector. Use the command sflow [extended-switch] [extended-router] [extended-gateway] enable command. By default packing of any of the extended information in the datagram is disabled. Use the command show sflow to confirm that extended information packing is enabled, as shown in Figure 37-6. 676 | sFlow
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