sFlow | 849Figure 41-6. Confirming that Extended sFlow is EnabledIf none of the extended information is enabled, the show output is as shown in Figure 41-7.Figure 41-7. Confirming that Extended sFlow is DisabledImportant Points to Remember• The IP destination address has to be learned via BGP in order to export extended-gateway data, prior toFTOS version 7.8.1.0.• If the IP destination address is not learned via BGP the Dell Force10 system does not exportextended-gateway data, prior to FTOS version 7.8.1.0.• FTOS 7.8.1.0 and later enhances the sFlow implementation for real time traffic analysis on theE-Series to provide extended gateway information in cases where the destination IP addresses arelearned by different routing protocols, and for cases where the destination is reachable over ECMP.• If the IP source address is learned via IGP then srcAS and srcPeerAS are zero.• The srcAS and srcPeerAS might be zero even though the IP source address is learned via BGP. TheDell Force10 system packs the srcAS and srcPeerAS information only if the route is learned via BGPand it is reachable via the ingress interface of the packet.The previous points are summarized in following table.FTOS#show sflowsFlow services are enabledGlobal default sampling rate: 4096Global default counter polling interval: 15Global extended information enabled: gateway, router, switch1 collectors configuredCollector IP addr: 10.10.10.3, Agent IP addr: 10.10.0.0, UDP port: 634377 UDP packets exported0 UDP packets dropped165 sFlow samples collected69 sFlow samples dropped due to sub-samplingLinecard 1 Port set 0 H/W sampling rate 8192Gi 1/16: configured rate 8192, actual rate 8192, sub-sampling rate 1Gi 1/17: configured rate 16384, actual rate 16384, sub-sampling rate 2Linecard 3 Port set 1 H/W sampling rate 16384Gi 3/40: configured rate 16384, actual rate 16384, sub-sampling rate 1Extended sFlow settingsshow all 3 types are enabledFTOS#show sflowsFlow services are disabledGlobal default sampling rate: 32768Global default counter polling interval: 20Global extended information enabled: none0 collectors configured0 UDP packets exported0 UDP packets dropped0 sFlow samples collected0 sFlow samples dropped due to sub-samplingIndicates no Extended sFlow typesenabled.
