diff --git a/conf/input.switch_legacy/switch_legacy.toml b/conf/input.switch_legacy/switch_legacy.toml
index 7e15825..8848347 100644
--- a/conf/input.switch_legacy/switch_legacy.toml
+++ b/conf/input.switch_legacy/switch_legacy.toml
@@ -1,7 +1,7 @@
 # # collect interval
 # interval = "300s"
 
-switch_id_label = "ident"
+switch_id_label = "ip"
 
 [mappings]
 "192.168.88.160" = "switch001.bj"
diff --git a/go.mod b/go.mod
index 442d9ae..3a8767a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module flashcat.cloud/categraf
 go 1.17
 
 require (
+	github.com/gaochao1/sw v1.0.0
 	github.com/go-ping/ping v0.0.0-20211130115550-779d1e919534
 	github.com/go-redis/redis/v8 v8.11.5
 	github.com/go-sql-driver/mysql v1.6.0
@@ -21,15 +22,18 @@ require (
 	github.com/prometheus/prometheus v2.5.0+incompatible
 	github.com/shirou/gopsutil/v3 v3.22.3
 	github.com/toolkits/pkg v1.2.9
+	github.com/ulricqin/gosnmp v0.0.1
 	golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27
 )
 
 require (
 	github.com/BurntSushi/toml v1.1.0 // indirect
+	github.com/alouca/gologger v0.0.0-20120904114645-7d4b7291de9c // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/fatih/camelcase v1.0.0 // indirect
 	github.com/fatih/structs v1.1.0 // indirect
+	github.com/freedomkk-qfeng/go-fastping v0.0.0-20160109021039-d7bb493dee3e // indirect
 	github.com/go-logfmt/logfmt v0.5.1 // indirect
 	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-ole/go-ole v1.2.6 // indirect
diff --git a/go.sum b/go.sum
index 306acb2..1f9fe32 100644
--- a/go.sum
+++ b/go.sum
@@ -40,6 +40,8 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/alouca/gologger v0.0.0-20120904114645-7d4b7291de9c h1:k/7/05/5kPRX7HaKyVYlsGVX6XkFTyYLqkqHzceUVlU=
+github.com/alouca/gologger v0.0.0-20120904114645-7d4b7291de9c/go.mod h1:SI1d/2/wpSTDjHgdS9ZLy6hqvsdhzVYAc8RLztweMpA=
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
@@ -71,9 +73,13 @@ github.com/frankban/quicktest v1.11.0/go.mod h1:K+q6oSqb0W0Ininfk863uOk1lMy69l/P
 github.com/frankban/quicktest v1.11.2/go.mod h1:K+q6oSqb0W0Ininfk863uOk1lMy69l/P6txr3mVT54s=
 github.com/frankban/quicktest v1.13.0 h1:yNZif1OkDfNoDfb9zZa9aXIpejNR4F23Wely0c+Qdqk=
 github.com/frankban/quicktest v1.13.0/go.mod h1:qLE0fzW0VuyUAJgPU19zByoIr0HtCHN/r/VLSOOIySU=
+github.com/freedomkk-qfeng/go-fastping v0.0.0-20160109021039-d7bb493dee3e h1:g8x+P3+xjxt7c53bucQW0ymvj+whjKfCLZH+99UMLS0=
+github.com/freedomkk-qfeng/go-fastping v0.0.0-20160109021039-d7bb493dee3e/go.mod h1:UcrAEbxjAhuq5beDj0conKRHGUhBPLkFt8aUmN/jrHY=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/fsnotify/fsnotify v1.4.9 h1:hsms1Qyu0jgnwNXIxa+/V/PDsU6CfLf6CNO8H7IWoS4=
 github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4IgpuI1SZQ=
+github.com/gaochao1/sw v1.0.0 h1:qctwr8LR1lLHpPTV+vw+YibSD3F3aaDnaK2xjUFyIDw=
+github.com/gaochao1/sw v1.0.0/go.mod h1:+n1WufEIsjuBADDSvPzycop9F3zAbXNMuV3U84UdwKE=
 github.com/garyburd/redigo v1.6.2/go.mod h1:NR3MbYisc3/PwhQ00EMzDiPmrwpPxAn5GI05/YaO1SY=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm+fLHvGI=
@@ -307,6 +313,8 @@ github.com/toolkits/pkg v1.2.9 h1:zGlrJDl+2sMBoxBRIoMtAwvKmW5wctuji2+qHCecMKk=
 github.com/toolkits/pkg v1.2.9/go.mod h1:ZUsQAOoaR99PSbes+RXSirvwmtd6+XIUvizCmrjfUYc=
 github.com/ugorji/go v1.1.7/go.mod h1:kZn38zHttfInRq0xu/PH0az30d+z6vm202qpg1oXVMw=
 github.com/ugorji/go/codec v1.1.7/go.mod h1:Ax+UKWsSmolVDwsd+7N3ZtXu+yMGCf907BLYF3GoBXY=
+github.com/ulricqin/gosnmp v0.0.1 h1:LmJ4y0tmnIe+qBeBAX9UjQvRLezso7VnN0bgslYnfzI=
+github.com/ulricqin/gosnmp v0.0.1/go.mod h1:9OasJbP94MjBGOLNghlVwgG3UN05ATurou1Gw+6rdzU=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
@@ -387,6 +395,7 @@ golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20201224014010-6772e930b67b/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/net v0.0.0-20210525063256-abc453219eb5 h1:wjuX4b5yYQnEQHzd+CBcrcC6OVR2J1CN6mUy0oSxIPo=
diff --git a/inputs/switch_legacy/lastcache.go b/inputs/switch_legacy/lastcache.go
new file mode 100644
index 0000000..0aa6f52
--- /dev/null
+++ b/inputs/switch_legacy/lastcache.go
@@ -0,0 +1,41 @@
+package switch_legacy
+
+import (
+	"sync"
+
+	"github.com/gaochao1/sw"
+)
+
+type LastifMap struct {
+	lock   *sync.RWMutex
+	ifstat map[string][]sw.IfStats
+}
+
+func NewLastifMap() *LastifMap {
+	return &LastifMap{
+		lock:   new(sync.RWMutex),
+		ifstat: make(map[string][]sw.IfStats),
+	}
+}
+
+func (m *LastifMap) Get(k string) []sw.IfStats {
+	m.lock.RLock()
+	defer m.lock.RUnlock()
+	if val, ok := m.ifstat[k]; ok {
+		return val
+	}
+	return nil
+}
+
+func (m *LastifMap) Set(k string, v []sw.IfStats) {
+	m.lock.Lock()
+	m.ifstat[k] = v
+	m.lock.Unlock()
+}
+
+func (m *LastifMap) Check(k string) bool {
+	m.lock.RLock()
+	_, ok := m.ifstat[k]
+	m.lock.RUnlock()
+	return ok
+}
diff --git a/inputs/switch_legacy/switch_legacy.go b/inputs/switch_legacy/switch_legacy.go
index e16cee0..1e5ff29 100644
--- a/inputs/switch_legacy/switch_legacy.go
+++ b/inputs/switch_legacy/switch_legacy.go
@@ -1,13 +1,20 @@
 package switch_legacy
 
 import (
+	"fmt"
+	"log"
 	"sync"
 	"sync/atomic"
+	"time"
 
 	"flashcat.cloud/categraf/config"
 	"flashcat.cloud/categraf/inputs"
+	"flashcat.cloud/categraf/pkg/conv"
 	"flashcat.cloud/categraf/types"
+	"github.com/gaochao1/sw"
+	"github.com/toolkits/pkg/concurrent/semaphore"
 	"github.com/toolkits/pkg/container/list"
+	go_snmp "github.com/ulricqin/gosnmp"
 )
 
 const inputName = "switch_legacy"
@@ -85,7 +92,7 @@ type Instance struct {
 	ConcurrencyForAddress int `toml:"concurrency_for_address"`
 	ConcurrencyForRequest int `toml:"concurrency_for_request"`
 
-	PingEnable       int64 `toml:"ping_enable"`
+	PingEnable       bool  `toml:"ping_enable"`
 	PingModeFastping bool  `toml:"ping_mode_fastping"`
 	PingTimeoutMs    int64 `toml:"ping_timeout_ms"`
 	PingRetries      int   `toml:"ping_retries"`
@@ -118,7 +125,8 @@ type Instance struct {
 
 	Customs []Custom `toml:"customs"`
 
-	parent *Switch
+	parent    *Switch
+	lastifmap *LastifMap
 }
 
 type Custom struct {
@@ -128,9 +136,523 @@ type Custom struct {
 }
 
 func (ins *Instance) Init() error {
+	ins.lastifmap = NewLastifMap()
 	return nil
 }
 
 func (ins *Instance) gatherOnce(slist *list.SafeList) error {
+	ips := ins.parseIPs()
+	if len(ips) == 0 {
+		log.Println("W! switch ips empty")
+		return nil
+	}
+
+	start := time.Now()
+	defer func() {
+		log.Println("I! switch gather use:", time.Since(start))
+	}()
+
+	log.Println("I! switch total ip count:", len(ips))
+
+	if ins.PingEnable {
+		ips = ins.gatherPing(ips, slist)
+	}
+
+	if ins.GatherFlowMetrics {
+		ins.gatherFlowMetrics(ips, slist)
+	}
+
+	if ins.GatherCpuMetrics {
+		ins.gatherCpuMetrics(ips, slist)
+	}
+
+	if ins.GatherMemMetrics {
+		ins.gatherMemMetrics(ips, slist)
+	}
+
+	if len(ins.Customs) > 0 {
+		ins.gatherCustoms(ips, slist)
+	}
+
 	return nil
 }
+
+func (ins *Instance) gatherCustoms(ips []string, slist *list.SafeList) {
+	wg := new(sync.WaitGroup)
+
+	for i := 0; i < len(ips); i++ {
+		ip := ips[i]
+		for j := 0; j < len(ins.Customs); j++ {
+			wg.Add(1)
+			go ins.custstat(wg, ip, slist, ins.Customs[j])
+		}
+	}
+
+	wg.Wait()
+}
+
+func (ins *Instance) custstat(wg *sync.WaitGroup, ip string, slist *list.SafeList, cust Custom) {
+	defer wg.Done()
+
+	defer func() {
+		if r := recover(); r != nil {
+			log.Println("E! recovered in custstat, ip:", ip, "oid:", cust.OID, "error:", r)
+		}
+	}()
+
+	var value float64
+	var err error
+	var snmpPDUs []go_snmp.SnmpPDU
+	for i := 0; i < ins.SnmpRetries; i++ {
+		snmpPDUs, err = sw.RunSnmp(ip, ins.Community, cust.OID, "get", int(ins.SnmpTimeoutMs))
+		if len(snmpPDUs) > 0 && err == nil {
+			value, err = conv.ToFloat64(snmpPDUs[0].Value)
+			if err == nil {
+				slist.PushFront(inputs.NewSample(cust.Metric, value, cust.Tags, ins.Labels))
+			} else {
+				log.Println("E! failed to convert to float64, ip:", ip, "oid:", cust.OID, "value:", snmpPDUs[0].Value)
+			}
+			break
+		}
+		time.Sleep(100 * time.Millisecond)
+	}
+}
+
+func (ins *Instance) gatherMemMetrics(ips []string, slist *list.SafeList) {
+	result := make(map[string]float64)
+	for i := 0; i < len(ips); i++ {
+		result[ips[i]] = -1
+	}
+
+	wg := new(sync.WaitGroup)
+	se := semaphore.NewSemaphore(ins.ConcurrencyForAddress)
+	for i := 0; i < len(ips); i++ {
+		ip := ips[i]
+		wg.Add(1)
+		se.Acquire()
+		go ins.memstat(wg, se, ip, result)
+	}
+	wg.Wait()
+
+	for ip, utilPercent := range result {
+		if utilPercent == -1 {
+			continue
+		}
+		slist.PushFront(inputs.NewSample("mem_util", utilPercent, map[string]string{ins.parent.SwitchIdLabel: ip}, ins.Labels))
+	}
+}
+
+func (ins *Instance) memstat(wg *sync.WaitGroup, sema *semaphore.Semaphore, ip string, result map[string]float64) {
+	defer func() {
+		sema.Release()
+		wg.Done()
+	}()
+
+	utilPercent, err := sw.MemUtilization(ip, ins.Community, int(ins.SnmpTimeoutMs), ins.SnmpRetries)
+	if err != nil {
+		log.Println("E! failed to gather mem, ip:", ip, "error:", err)
+		return
+	}
+
+	result[ip] = float64(utilPercent)
+}
+
+func (ins *Instance) gatherCpuMetrics(ips []string, slist *list.SafeList) {
+	result := make(map[string]float64)
+	for i := 0; i < len(ips); i++ {
+		result[ips[i]] = -1
+	}
+
+	wg := new(sync.WaitGroup)
+	se := semaphore.NewSemaphore(ins.ConcurrencyForAddress)
+	for i := 0; i < len(ips); i++ {
+		ip := ips[i]
+		wg.Add(1)
+		se.Acquire()
+		go ins.cpustat(wg, se, ip, result)
+	}
+	wg.Wait()
+
+	for ip, utilPercent := range result {
+		if utilPercent == -1 {
+			continue
+		}
+		slist.PushFront(inputs.NewSample("cpu_util", utilPercent, map[string]string{ins.parent.SwitchIdLabel: ip}, ins.Labels))
+	}
+}
+
+func (ins *Instance) cpustat(wg *sync.WaitGroup, sema *semaphore.Semaphore, ip string, result map[string]float64) {
+	defer func() {
+		sema.Release()
+		wg.Done()
+	}()
+
+	utilPercent, err := sw.CpuUtilization(ip, ins.Community, int(ins.SnmpTimeoutMs), ins.SnmpRetries)
+	if err != nil {
+		log.Println("E! failed to gather cpu, ip:", ip, "error:", err)
+		return
+	}
+
+	result[ip] = float64(utilPercent)
+}
+
+type ChIfStat struct {
+	IP          string
+	UseTime     int64
+	IfStatsList []sw.IfStats
+}
+
+func (ins *Instance) gatherFlowMetrics(ips []string, slist *list.SafeList) {
+	result := make(map[string]*ChIfStat)
+	for i := 0; i < len(ips); i++ {
+		result[ips[i]] = nil
+	}
+
+	wg := new(sync.WaitGroup)
+	se := semaphore.NewSemaphore(ins.ConcurrencyForAddress)
+	for i := 0; i < len(ips); i++ {
+		ip := ips[i]
+		wg.Add(1)
+		se.Acquire()
+		go ins.ifstat(wg, se, ip, result)
+	}
+	wg.Wait()
+
+	for ip := range result {
+		if result[ip].IP == "" {
+			continue
+		}
+
+		stats := result[ip].IfStatsList
+		for i := 0; i < len(stats); i++ {
+			ifStat := stats[i]
+
+			if ifStat.IfName == "" {
+				continue
+			}
+
+			tags := map[string]string{
+				ins.parent.SwitchIdLabel: ip,
+				"ifname":                 ifStat.IfName,
+			}
+
+			if ins.IndexTag {
+				tags["ifindex"] = fmt.Sprint(ifStat.IfIndex)
+			}
+
+			for k, v := range ins.Labels {
+				tags[k] = v
+			}
+
+			if ins.GatherOperStatus {
+				slist.PushFront(inputs.NewSample("if_oper_status", ifStat.IfOperStatus, tags))
+			}
+
+			slist.PushFront(inputs.NewSample("if_speed", ifStat.IfSpeed, tags))
+
+			if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+				for _, lastifStat := range lastIfStatList {
+					if ifStat.IfIndex == lastifStat.IfIndex {
+						interval := ifStat.TS - lastifStat.TS
+
+						speedlimit := ins.SpeedLimit
+						if speedlimit == 0 {
+							speedlimit = float64(ifStat.IfSpeed)
+						}
+
+						IfHCInOctets := 8 * (float64(ifStat.IfHCInOctets) - float64(lastifStat.IfHCInOctets)) / float64(interval)
+						IfHCOutOctets := 8 * (float64(ifStat.IfHCOutOctets) - float64(lastifStat.IfHCOutOctets)) / float64(interval)
+
+						if limitCheck(IfHCInOctets, speedlimit) {
+							slist.PushFront(inputs.NewSample("if_in", IfHCInOctets, tags))
+							if ifStat.IfSpeed > 0 {
+								slist.PushFront(inputs.NewSample("if_in_speed_percent", 100*IfHCInOctets/float64(ifStat.IfSpeed), tags))
+							}
+						} else {
+							log.Println("W! if_in out of range, current:", ifStat.IfHCInOctets, "lasttime:", lastifStat.IfHCInOctets, "tags:", tags)
+						}
+
+						if limitCheck(IfHCOutOctets, speedlimit) {
+							slist.PushFront(inputs.NewSample("if_out", IfHCOutOctets, tags))
+							if ifStat.IfSpeed > 0 {
+								slist.PushFront(inputs.NewSample("if_out_speed_percent", 100*IfHCOutOctets/float64(ifStat.IfSpeed), tags))
+							}
+						} else {
+							log.Println("W! if_out out of range, current:", ifStat.IfHCOutOctets, "lasttime:", lastifStat.IfHCOutOctets, "tags:", tags)
+						}
+					}
+				}
+			}
+
+			if ins.GatherBroadcastPkt {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+
+							IfHCInBroadcastPkts := (float64(ifStat.IfHCInBroadcastPkts) - float64(lastifStat.IfHCInBroadcastPkts)) / float64(interval)
+							IfHCOutBroadcastPkts := (float64(ifStat.IfHCOutBroadcastPkts) - float64(lastifStat.IfHCOutBroadcastPkts)) / float64(interval)
+
+							if limitCheck(IfHCInBroadcastPkts, ins.BroadcastPktLimit) {
+								slist.PushFront(inputs.NewSample("if_in_broadcast_pkt", IfHCInBroadcastPkts, tags))
+							} else {
+								log.Println("W! if_in_broadcast_pkt out of range, current:", ifStat.IfHCInBroadcastPkts, "lasttime:", lastifStat.IfHCInBroadcastPkts, "tags:", tags)
+							}
+
+							if limitCheck(IfHCOutBroadcastPkts, ins.BroadcastPktLimit) {
+								slist.PushFront(inputs.NewSample("if_out_broadcast_pkt", IfHCOutBroadcastPkts, tags))
+							} else {
+								log.Println("W! if_out_broadcast_pkt out of range, current:", ifStat.IfHCOutBroadcastPkts, "lasttime:", lastifStat.IfHCOutBroadcastPkts, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			if ins.GatherMulticastPkt {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+
+							IfHCInMulticastPkts := (float64(ifStat.IfHCInMulticastPkts) - float64(lastifStat.IfHCInMulticastPkts)) / float64(interval)
+							IfHCOutMulticastPkts := (float64(ifStat.IfHCOutMulticastPkts) - float64(lastifStat.IfHCOutMulticastPkts)) / float64(interval)
+
+							if limitCheck(IfHCInMulticastPkts, ins.MulticastPktLimit) {
+								slist.PushFront(inputs.NewSample("if_in_multicast_pkt", IfHCInMulticastPkts, tags))
+							} else {
+								log.Println("W! if_in_multicast_pkt out of range, current:", ifStat.IfHCInMulticastPkts, "lasttime:", lastifStat.IfHCInMulticastPkts, "tags:", tags)
+							}
+
+							if limitCheck(IfHCOutMulticastPkts, ins.MulticastPktLimit) {
+								slist.PushFront(inputs.NewSample("if_out_multicast_pkt", IfHCOutMulticastPkts, tags))
+							} else {
+								log.Println("W! if_out_multicast_pkt out of range, current:", ifStat.IfHCOutMulticastPkts, "lasttime:", lastifStat.IfHCOutMulticastPkts, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			if ins.GatherDiscards {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+
+							IfInDiscards := (float64(ifStat.IfInDiscards) - float64(lastifStat.IfInDiscards)) / float64(interval)
+							IfOutDiscards := (float64(ifStat.IfOutDiscards) - float64(lastifStat.IfOutDiscards)) / float64(interval)
+
+							if limitCheck(IfInDiscards, ins.DiscardsPktLimit) {
+								slist.PushFront(inputs.NewSample("if_in_discards", IfInDiscards, tags))
+							} else {
+								log.Println("W! if_in_discards out of range, current:", ifStat.IfInDiscards, "lasttime:", lastifStat.IfInDiscards, "tags:", tags)
+							}
+
+							if limitCheck(IfOutDiscards, ins.DiscardsPktLimit) {
+								slist.PushFront(inputs.NewSample("if_out_discards", IfOutDiscards, tags))
+							} else {
+								log.Println("W! if_out_discards out of range, current:", ifStat.IfOutDiscards, "lasttime:", lastifStat.IfOutDiscards, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			if ins.GatherErrors {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+
+							IfInErrors := (float64(ifStat.IfInErrors) - float64(lastifStat.IfInErrors)) / float64(interval)
+							IfOutErrors := (float64(ifStat.IfOutErrors) - float64(lastifStat.IfOutErrors)) / float64(interval)
+
+							if limitCheck(IfInErrors, ins.ErrorsPktLimit) {
+								slist.PushFront(inputs.NewSample("if_in_errors", IfInErrors, tags))
+							} else {
+								log.Println("W! if_in_errors out of range, current:", ifStat.IfInErrors, "lasttime:", lastifStat.IfInErrors, "tags:", tags)
+							}
+
+							if limitCheck(IfOutErrors, ins.ErrorsPktLimit) {
+								slist.PushFront(inputs.NewSample("if_out_errors", IfOutErrors, tags))
+							} else {
+								log.Println("W! if_out_errors out of range, current:", ifStat.IfOutErrors, "lasttime:", lastifStat.IfOutErrors, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			if ins.GatherUnknownProtos {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+							IfInUnknownProtos := (float64(ifStat.IfInUnknownProtos) - float64(lastifStat.IfInUnknownProtos)) / float64(interval)
+							if limitCheck(IfInUnknownProtos, ins.UnknownProtosPktLimit) {
+								slist.PushFront(inputs.NewSample("if_in_unknown_protos", IfInUnknownProtos, tags))
+							} else {
+								log.Println("W! if_in_unknown_protos out of range, current:", ifStat.IfInUnknownProtos, "lasttime:", lastifStat.IfInUnknownProtos, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			if ins.GatherOutQlen {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+							IfOutQLen := (float64(ifStat.IfOutQLen) - float64(lastifStat.IfOutQLen)) / float64(interval)
+							if limitCheck(IfOutQLen, ins.OutQlenPktLimit) {
+								slist.PushFront(inputs.NewSample("if_out_qlen", IfOutQLen, tags))
+							} else {
+								log.Println("W! if_out_qlen out of range, current:", ifStat.IfOutQLen, "lasttime:", lastifStat.IfOutQLen, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			if ins.GatherPkt {
+				if lastIfStatList := ins.lastifmap.Get(ip); lastIfStatList != nil {
+					for _, lastifStat := range lastIfStatList {
+						if ifStat.IfIndex == lastifStat.IfIndex {
+							interval := ifStat.TS - lastifStat.TS
+
+							IfHCInUcastPkts := (float64(ifStat.IfHCInUcastPkts) - float64(lastifStat.IfHCInUcastPkts)) / float64(interval)
+							IfHCOutUcastPkts := (float64(ifStat.IfHCOutUcastPkts) - float64(lastifStat.IfHCOutUcastPkts)) / float64(interval)
+
+							if limitCheck(IfHCInUcastPkts, ins.PktLimit) {
+								slist.PushFront(inputs.NewSample("if_in_pkts", IfHCInUcastPkts, tags))
+							} else {
+								log.Println("W! if_in_pkts out of range, current:", ifStat.IfHCInUcastPkts, "lasttime:", lastifStat.IfHCInUcastPkts, "tags:", tags)
+							}
+
+							if limitCheck(IfHCOutUcastPkts, ins.PktLimit) {
+								slist.PushFront(inputs.NewSample("if_out_pkts", IfHCOutUcastPkts, tags))
+							} else {
+								log.Println("W! if_out_pkts out of range, current:", ifStat.IfHCOutUcastPkts, "lasttime:", lastifStat.IfHCOutUcastPkts, "tags:", tags)
+							}
+						}
+					}
+				}
+			}
+
+			// update lastifmap
+			ins.lastifmap.Set(ip, stats)
+		}
+	}
+
+}
+
+func (ins *Instance) ifstat(wg *sync.WaitGroup, sema *semaphore.Semaphore, ip string, result map[string]*ChIfStat) {
+	defer func() {
+		sema.Release()
+		wg.Done()
+	}()
+
+	var (
+		ifList []sw.IfStats
+		err    error
+		start  = time.Now()
+	)
+
+	if ins.SnmpModeGosnmp {
+		ifList, err = sw.ListIfStats(ip, ins.Community, int(ins.SnmpTimeoutMs), ins.IgnoreIfaces, ins.SnmpRetries, ins.ConcurrencyForRequest, !ins.GatherPkt, !ins.GatherOperStatus, !ins.GatherBroadcastPkt, !ins.GatherMulticastPkt, !ins.GatherDiscards, !ins.GatherErrors, !ins.GatherUnknownProtos, !ins.GatherOutQlen)
+	} else {
+		ifList, err = sw.ListIfStatsSnmpWalk(ip, ins.Community, int(ins.SnmpTimeoutMs)*5, ins.IgnoreIfaces, ins.SnmpRetries, !ins.GatherPkt, !ins.GatherOperStatus, !ins.GatherBroadcastPkt, !ins.GatherMulticastPkt, !ins.GatherDiscards, !ins.GatherErrors, !ins.GatherUnknownProtos, !ins.GatherOutQlen)
+	}
+
+	if config.Config.DebugMode {
+		log.Println("D! switch gather ifstat, ip:", ip, "use:", time.Since(start))
+	}
+
+	if err != nil {
+		log.Println("E! failed to gather ifstat, ip:", ip, "error:", err)
+		return
+	}
+
+	if len(ifList) > 0 {
+		result[ip] = &ChIfStat{
+			IP:          ip,
+			IfStatsList: ifList,
+		}
+	}
+}
+
+func (ins *Instance) gatherPing(ips []string, slist *list.SafeList) []string {
+	// init ping result
+	pingResult := make(map[string]bool)
+	for i := 0; i < len(ips); i++ {
+		// init ping result
+		pingResult[ips[i]] = false
+	}
+
+	wg := new(sync.WaitGroup)
+	se := semaphore.NewSemaphore(ins.ConcurrencyForAddress)
+	for i := 0; i < len(ips); i++ {
+		ip := ips[i]
+		wg.Add(1)
+		se.Acquire()
+		go ins.ping(wg, se, ip, pingResult)
+	}
+	wg.Wait()
+
+	ips = make([]string, 0, len(ips))
+	for ip, succ := range pingResult {
+		val := 0
+		if succ {
+			val = 1
+			ips = append(ips, ip)
+		}
+
+		if ins.GatherPingMetrics {
+			slist.PushFront(inputs.NewSample("ping_up", val, map[string]string{ins.parent.SwitchIdLabel: ip}, ins.Labels))
+		}
+	}
+
+	log.Println("I! switch alive ip count:", len(ips))
+	return ips
+}
+
+func (ins *Instance) parseIPs() (lst []string) {
+	for i := 0; i < len(ins.IPs); i++ {
+		item := ins.IPs[i]
+
+		aip := sw.ParseIp(item)
+		for _, ip := range aip {
+			lst = append(lst, ip)
+		}
+	}
+	return
+}
+
+func (ins *Instance) ping(wg *sync.WaitGroup, sema *semaphore.Semaphore, ip string, result map[string]bool) {
+	defer func() {
+		sema.Release()
+		wg.Done()
+	}()
+
+	for i := 0; i < ins.PingRetries; i++ {
+		succ := sw.Ping(ip, int(ins.PingTimeoutMs), ins.PingModeFastping)
+		if succ {
+			result[ip] = succ
+			break
+		}
+	}
+}
+
+func limitCheck(value float64, limit float64) bool {
+	if value < 0 {
+		return false
+	}
+	if limit > 0 {
+		if value > limit {
+			return false
+		}
+	}
+	return true
+}
diff --git a/pkg/conv/conv.go b/pkg/conv/conv.go
index 6196fb0..8e52d42 100644
--- a/pkg/conv/conv.go
+++ b/pkg/conv/conv.go
@@ -13,6 +13,11 @@ func ToFloat64(val interface{}) (float64, error) {
 			return f, nil
 		}
 
+		// try int
+		if i, err := strconv.ParseInt(v, 0, 64); err == nil {
+			return float64(i), nil
+		}
+
 		// try bool
 		b, err := strconv.ParseBool(v)
 		if err == nil {