Linux as a Switch Operating System: Five Lessons Learned identifies benefits of using Linux as the basis for EOS. In this context, the Linux operating system made it easy to port the Host sFlow agent, use standard Linux package management (RPM Package Manager), and gather metrics using standard Linux APIs. A new eAPI module automatically synchronizes the Host sFlow daemon with the EOS sFlow configuration.
The following sflowtool output shows the additional metrics contributed by a Host sFlow agent installed on an Arista switch:
startDatagram ================================= datagramSourceIP 172.17.0.1 datagramSize 704 unixSecondsUTC 1490843418 datagramVersion 5 agentSubId 100000 agent 10.0.0.90 packetSequenceNo 714 sysUpTime 0 samplesInPacket 1 startSample ---------------------- sampleType_tag 0:2 sampleType COUNTERSSAMPLE sampleSequenceNo 714 sourceId 2:1 counterBlock_tag 0:2001 counterBlock_tag 0:2010 udpInDatagrams 1459 udpNoPorts 16 udpInErrors 0 udpOutDatagrams 4765 udpRcvbufErrors 0 udpSndbufErrors 0 udpInCsumErrors 0 counterBlock_tag 0:2009 tcpRtoAlgorithm 1 tcpRtoMin 200 tcpRtoMax 120000 tcpMaxConn 4294967295 tcpActiveOpens 102 tcpPassiveOpens 100 tcpAttemptFails 0 tcpEstabResets 0 tcpCurrEstab 8 tcpInSegs 19930 tcpOutSegs 19804 tcpRetransSegs 0 tcpInErrs 0 tcpOutRsts 2 tcpInCsumErrors 0 counterBlock_tag 0:2008 icmpInMsgs 1606 icmpInErrors 0 icmpInDestUnreachs 16 icmpInTimeExcds 0 icmpInParamProbs 0 icmpInSrcQuenchs 0 icmpInRedirects 0 icmpInEchos 1590 icmpInEchoReps 0 icmpInTimestamps 0 icmpInAddrMasks 0 icmpInAddrMaskReps 0 icmpOutMsgs 0 icmpOutErrors 1606 icmpOutDestUnreachs 0 icmpOutTimeExcds 16 icmpOutParamProbs 0 icmpOutSrcQuenchs 0 icmpOutRedirects 0 icmpOutEchos 0 icmpOutEchoReps 0 icmpOutTimestamps 1590 icmpOutTimestampReps 0 icmpOutAddrMasks 0 icmpOutAddrMaskReps 0 counterBlock_tag 0:2007 ipForwarding 2 ipDefaultTTL 64 ipInReceives 24685 ipInHdrErrors 0 ipInAddrErrors 42 ipForwDatagrams 0 ipInUnknownProtos 0 ipInDiscards 0 ipInDelivers 23025 ipOutRequests 26170 ipOutDiscards 0 ipOutNoRoutes 0 ipReasmTimeout 0 ipReasmReqds 0 ipReasmOKs 0 ipReasmFails 0 ipFragOKs 4 ipFragFails 0 ipFragCreates 8 counterBlock_tag 0:2005 disk_total 1907843072 disk_free 1083969536 disk_partition_max_used 43.18 disk_reads 16549 disk_bytes_read 1337825280 disk_read_time 7420 disk_writes 412 disk_bytes_written 1159168 disk_write_time 216 counterBlock_tag 0:2004 mem_total 1938849792 mem_free 85483520 mem_shared 0 mem_buffers 106614784 mem_cached 735801344 swap_total 0 swap_free 0 page_in 830716 page_out 566 swap_in 0 swap_out 0 counterBlock_tag 0:2003 cpu_load_one 0.070 cpu_load_five 0.060 cpu_load_fifteen 0.050 cpu_proc_run 0 cpu_proc_total 221 cpu_num 1 cpu_speed 2698 cpu_uptime 17265 cpu_user 272510 cpu_nice 50 cpu_system 178050 cpu_idle 16279880 cpu_wio 550 cpuintr 461060 cpu_sintr 41840 cpuinterrupts 5458397 cpu_contexts 5338141 cpu_steal 0 cpu_guest 0 cpu_guest_nice 0 counterBlock_tag 0:2006 nio_bytes_in 8149749 nio_pkts_in 115730 nio_errs_in 0 nio_drops_in 0 nio_bytes_out 4996846 nio_pkts_out 28451 nio_errs_out 0 nio_drops_out 0 counterBlock_tag 0:2000 hostname leaf1 UUID 33-28-66-a5-82-27-43-49-a5-f1-c1-ba-cc-6c-1d-d3 machine_type 2 os_name 2 os_release 3.4.43.Ar-4170906.4180F endSample ---------------------- endDatagram =================================There are a number of additional open source and commercial sFlow collectors available.
Installing Host sFlow agent on an Arista switch
The following steps download and install the Host sFlow agent on an Arista switch and direct the telemetry stream to collector 10.0.0.50:1. Install the Host sFlow agent (hsflowd)
eos# copy https://github.com/sflow/host-sflow/releases/download/v2.0.9-1/hsflowd-eos-2.0.9-1.i686.rpm extension: eos# extension hsflowd-eos-2.0.9-1.i686.rpm eos# bash sudo service hsflowd start eos# copy installed-extensions boot-extensions2. Enable eAPI, see eAPI and Unix Domain Socket
eos(config)# management api http-commands eos(config-mgmt-api-http-cmds)# protocol unix-socket eos(config-mgmt-api-http-cmds)# no shutdown3. Configure switch to run hsflowd on startup:
eos(config)# event-handler hsflowd eos(config-handler-hsflowd)# trigger on-boot eos(config-handler-hsflowd)# action bash sudo service hsflowd start eos(config-handler-hsflowd)# delay 60 eos(config-handler-hsflowd)# asynchronous4. Configure sFlow Introduction to Managing EOS Devices – Setting up Management
eos(config)# sflow source-interface Management1 eos(config)# sflow destination 10.0.0.50 eos(config)# sflow runThe host metrics should immediately begin to be received at the sFlow collector.
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