按WIKI配置了SNMP实例IP地址，但启动后检测不到目标交换机存活，自己读取本机的SNMP

[Hmm-zhang]

按WIKI配置了SNMP实例IP地址，但启动后检测不到目标交换机存活，自己读取本机的SNMP（10.0.0.111是运行swcollector的服务器），是哪里配置有问题吗？
[root@Nightingale swcollector]# ./control tail
2021/02/24 16:45:37 cfg.go:165: read config file: cfg.json successfully
2021/02/24 16:45:37 http.go:68: listening :1989
2021/02/24 16:45:37 swifstat.go:166: UpdateIfStats start. The number of concurrent limited to 1000. IP addresses number is 1
2021/02/24 16:45:37 swifstat.go:168: get snmp message by gosnmp
2021/02/24 16:45:42 ifstat.go:459: 10.0.0.111 1.3.6.1.2.1.31.1.1.1.6 Error reading from UDP: read udp 10.0.0.111:53137->10.0.0.111:161: read: connection refused

2021/02/24 16:45:42 ifstat.go:459: 10.0.0.111 1.3.6.1.2.1.31.1.1.1.10 Error reading from UDP: read udp 10.0.0.111:45188->10.0.0.111:161: read: connection refused

2021/02/24 16:45:42 ifstat.go:459: 10.0.0.111 1.3.6.1.2.1.31.1.1.1.1 Error reading from UDP: read udp 10.0.0.111:56487->10.0.0.111:161: read: connection refused

2021/02/24 16:45:42 ifstat.go:459: 10.0.0.111 1.3.6.1.2.1.31.1.1.1.15 Error reading from UDP: read udp 10.0.0.111:39244->10.0.0.111:161: read: connection refused

2021/02/24 16:45:42 swifstat.go:422: UpdateIfStats complete. Process time 5.526424147s. Number of active ip is 1
2021/02/24 16:45:43 swcpu.go:43: Error reading from UDP: read udp 10.0.0.111:37192->10.0.0.111:161: read: connection refused

2021/02/24 16:45:43 swmem.go:43: Error reading from UDP: read udp 10.0.0.111:47339->10.0.0.111:161: read: connection refused

配置如下：
{
"debug": false,
"debugmetric":{
"endpoints":["endpoint-vpn"],
"metrics":["AnyconnectSession","ConnectionStat"],
"tags":""
},
"switch":{
"enabled": true,
"ipRange":[
"10.0.252.31"
],
"gosnmp":true,
"index_tag":false,
"pingTimeout":5000,
"pingRetry":4,
"community":"public",
"snmpTimeout":1000,
"snmpRetry":5,
"ignoreIface": ["Nu","NU","Vlan","Vl"],
"ignoreOperStatus": true,
"speedlimit":0,
"ignorePkt": true,
"pktlimit": 0,
"ignoreBroadcastPkt": true,
"broadcastPktlimit": 0,
"ignoreMulticastPkt": true,
"multicastPktlimit": 0,
"ignoreDiscards": true,
"discardsPktlimit": 0,
"ignoreErrors": true,
"errorsPktlimit": 0,
"ignoreUnknownProtos":true,
"unknownProtosPktlimit": 0,
"ignoreOutQLen":true,
"outQLenPktlimit": 0,
"fastPingMode": true,
"limitConcur": 1000,
"limitCon": 4
},