telegraf监控网络设备对象列表状态总是会反复down

down的设备都是写在同一个inputs.snmp中的，只有这个模块里的设备会这样，其余两个没啥问题，代码是：
[[inputs.snmp]]
agents = [
"10.75.255.255",
"10.75.255.251",
"10.75.255.250",
"10.75.255.249",
"10.75.255.248",
]
timeout = "5s"
version = 3
...
agent_host_tag = "ident"
retries = 1

[[inputs.snmp.field]]
oid = "RFC1213-MIB::sysUpTime.0"
name = "uptime"

[[inputs.snmp.field]]
oid = "RFC1213-MIB::sysName.0"
name = "sysName"
is_tag = true

[[inputs.snmp.table]]
name = "interface"
oid = "IF-MIB::ifTable"

[[inputs.snmp.table]]
name = "interface"
oid = "IF-MIB::ifDescr"

[[inputs.snmp]]
agents = ["10.75.252.22"]
timeout = "5s"
version = 2
community = "public"
agent_host_tag = "ident"
retries = 1

[[inputs.snmp.field]]
oid = "RFC1213-MIB::sysUpTime.0"
name = "uptime"

[[inputs.snmp.field]]
oid = "RFC1213-MIB::sysName.0"
name = "sysName"
is_tag = true

[[inputs.snmp.field]]
name = "ifDescr"
oid = "IF-MIB::ifDescr"
is_tag = true

[[inputs.snmp.table]]
name = "interface"
oid = "IF-MIB::ifTable"
不知道问题出在哪里。