MSTP/1/NEWRT:OID [oid] This bridge has changed to be the root bridge.

生成树协议计算后，本桥选举成为拓扑中新的根桥。

MSTP/1/TOPOC:OID [OID] Bridge topology change.

生成树协议计算出的拓扑发生改变。

除了边缘端口之外，其它任何STP端口状态从阻塞变成转发都会触发topologyChange告警。

MSTP/4/PFWD:OID [oid] The port has been set to forwarding state. (InstanceID=[INTEGER], PortInstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], PortName=[STRING])

有新的链路加入拓扑网络，端口状态变为forwarding状态。

MSTP/4/PDISC:OID [oid] The port has been set to discarding state. (InstanceID=[INTEGER], PortInstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], PortName=[STRING])

链路状态发生变化，端口状态变为Discarding状态。

MSTP/2/ROOT:OID [OID]: This bridge is no longer the root bridge of the instance [instance-id].

网络中存在一个更优的设备并且已经成为根桥，当前设备根桥地位不能再保持产生此告警。

MSTP/2/RGSUP:OID [oid] The ROOT-Protection port received superior message. (InstanceID=[INTEGER], PortInstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], PortName=[STRING])

根桥保护圈外部出现了优先级高的交换机欲争夺根桥地位。

MSTP/2/IVBPDU:OID [oid] The edged-port that enabled BPDU-Protection will be shutdown, because it received BPDU packet. (InstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], PortName=[STRING])

与用户相连的端口上（启动了BPDU保护功能）收到了BPDU报文，该报文可能是用户恶意攻击的报文。

MSTP/2/LGEXP:OID [OID] The LOOP-Protection port did not receive BPDU packets in prescriptive time. (InstanceID=[INTEGER], PortInstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], PortName=[STRING])

循环保护端口规定的时间内收不到BPDU，端口被置为discarding状态。

MSTP/4/EDGEPORT_DISABLE:OID [oid] When the port receives a BPDU packet, the edged-port attribute will be disabled. (InstanceID=[INTEGER], PortID=[INTEGER], IfIndex=[INTEGER], EdgePortEnableState=[INTEGER], PortName=[STRING])

边缘端口在收到BPDU报文后将失去边缘端口属性。

MSTP/4/TCGUARD:OID [OID] The instance received TC message exceeded the threshold will be deferred to deal with at the end of TC protection time. (InstanceID=[INTEGER])

在启用MSTP的设备上启用TC保护功能，单位时间内收到的TC报文超过阈值，超过阈值的TC消息将被延迟到TC保护时间超时后处理。

MSTP/1/PROTCGUARD:OID [OID] MSTP process's instance received TC message exceeded the threshold will be deferred to deal with at the end of TC protection time. (ProcessID=[INTEGER], InstanceID=[INTEGER])

MSTP进程启用TC保护功能，单位时间内收到的TC报文超过阈值，超过阈值的TC消息将被延迟到该MSTP进程TC保护时间超时后处理。

MSTP/4/PRORTCHANGED:OID [oid] The root bridge of MSTP process has changed. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID=[INTEGER], PreviousRootBridgeID=[STRING], NewRootBridgeID=[STRING])

根桥发生变化，包括成为根桥和不再是根桥。

MSTP/4/PROPFWD:OID [oid] The MSTP Process's Port has been set to forwarding state. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

MSTP进程内的链路状态发生变化，端口状态变为forwarding状态。

MSTP/4/PROPDISC:OID [oid] The MSTP Process's Port has been set to discarding state. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

MSTP进程的链路状态发生变化，端口状态变为Discarding状态。

MSTP/1/PROROOT:OID [oid] MSTP process [process-id] is no longer the root bridge of the instance [instance-id].

MSTP进程的根桥地位不能再保持，网络中存在一个更优的MSTP进程的并且已经成为根桥。

MSTP/4/PRORGSUP:OID [oid] The MSTP process's instance's ROOT-Protection port received superior message. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

根桥保护圈外部出现了优先级高的欲争夺MSTP进程根桥地位。

MSTP/4/PROIVBPDU:OID [oid] The MSTP process's edged-port that enabled BPDU-Protection will be shutdown, because it received BPDU packet. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

与用户相连的MSTP进程的端口上（启动了BPDU保护功能）收到了BPDU报文，该报文可能是用户恶意攻击的报文。

MSTP/4/PROLGEXP:OID [oid] The MSTP process's instance's LOOP-Protection port did not receive BPDU packets in prescriptive time. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

启用环路保护MSTP进程端口规定的时间内收不到BPDU，MSTP进程端口被置为discarding状态。

MSTP/4/PROEDGEDISABLE:OID [oid] When the port receives a BPDU packet, the edged-port attribute will be disabled. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

MSTP进程内的边缘端口，在收到BPDU报文后将失去边缘端口属性。

MSTP/4/PROLBDETECTGED:OID [OID] The MSTP Process's Port has been set to discarding state because of detecting loopback. (ProcessID=[INTEGER], InstanceID=[INTEGER], PortID1=[INTEGER], PortID2=[INTEGER], PortID3=[INTEGER], PortID4=[INTEGER], PortIDFlag=[INTEGER], IfIndex=[INTEGER], PortState=[INTEGER], PortName=[STRING])

端口检测到本地环回后，阻塞端口并触发告警。

MSTP/4/PORT_COUNT_EXCEED_THRESHOLD: OID [OID] The number of Up STP-capable interfaces exceeded the upper threshold, which may overload the CPU. Delete redundant member interfaces. (UpperThreshold=[INTEGER])

当前设备使能生成树协议且端口状态为Up的端口数量超过上限阈值之后，触发该告警。

MSTP/4/PORT_COUNT_UNDER_THRESHOLD: OID [OID] The number of Up STP-capable interfaces fell below the lower threshold.(LowerThreshold=[INTEGER])

当前设备使能生成树协议且端口状态为Up的端口数量低于下限阈值之后，触发该告警。