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某局点S12510-s 读取 ifin(out)discards节点 有丢包计数
该discards 节点统计的丢包,一般包含如下几类:
1 VLAN相关丢包计数(例如vlan过滤)
2出方向过滤丢包,包括acl过滤,stp阻塞、组播报文过滤、没有出端口等
3 端口队列丢包,包括一些端口限速,带宽保证等配置触发的丢包、端口流量打满导致的丢包、高速口往低速口打流导致的突发拥塞丢包等
该节点统计中有些丢包是正常的,例如vlan过滤,Acl过滤等,不能说明端口存在故障丢包。
以outdiscards为例
ifOutDiscards OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of outbound packets which were chosen to be
discarded even though no errors had been detected to prevent 官方的节点说明中也说明了,会将正常的丢弃统计在内
their being transmitted. One possible reason for discarding
such a packet could be to free up buffer space.
Discontinuities in the value of this counter can occur at
re-initialization of the management system, and at other
times as indicated by the value of
ifCounterDiscontinuityTime."
该节点统计比较笼统,不具有参考意义。当前mib实现,没有错误丢包,或则异常丢包这么细致,只有错包ifOutErrors。一般丢包都是报有业务影响,然后通过流统来确认设备异常丢包情况。
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