交换机中继（Trunk）的故障处理

　　MSS 上的ATM中继（Trunk）是ATM网络上节点间的逻辑连接，是建立在物理连接之上。ATM中继（Trunk）支持DPRS，可以承载帧中继（Frame Relay）业务。通常ATM中继（Trunk）是ATM 接口下一条VC电路。在Nortel MSS ATM网络内，ATM接口设定为PNNI.而与其它网络连接时，ATM接口设定为IISP.其中VCI和VPI的值时可以随意设定，只要是在允许范围之内。

　　中继（Trunk）构造和关联的示意图，如下：

> d trk/* Trk/* Use -noTabular to see the many hidden attributes. +=====+-----+----+-----+------+--------------------+----------+-------+----- | Trk |osiAd|osiO|osiUs|snmpOp| remote | spd | rtd | mtu | | min |per | age |erStat| | bit/s| msec|bytes | | | | | us | | | | +=====+-----+----+-----+------+--------------------+----------+-------+----- | 1032|unlck|ena |busy |up |EM/SHSHYJP15K1 | 14490624| 0.5|65512 | | | | | | TRUNK/05232 | | | | 2032|unlck|ena |busy |up |EM/BJBJCQP15K1 | 14490624| 2.3|65512 | | | | | | TRUNK/06232 | | | ok 2006-04-06 23:55:44.41

　　问题一：

　　ATM中继（Trunk）状态是正常，有流量，但是用户电路无法迂回至此条中继上。

　　解决思路：

　　1、首先检查ATM中继（Trunk）的Atmif下是否有PNNI设置，并且在运行状态下正常。检查命令如下：

> d atmif/23 pnni rcc AtmIf/23 Pnni Rcc adminState = unlocked operationalState = enabled usageState = active type = lowestLevelHorizLink negotiatedVersion = version1point0 helloState = twoWayInside remoteNodeId = 28A045861941010104000F000000000090CFF5280028 remoteNodeName = SHSHPP7K02 remotePortId = 655361 remoteInterfaceName = Atmif/10 helloPacketsRx = 24339 helloPacketsTx = 24368 mismatchedHelloPacketsRx = 1 badHelloPacketsRx = 0 ok 2005-04-17 16:34:11.93

> d atmif/23 pnni sig AtmIf/23 Pnni Sig adminState = unlocked operationalState = enabled usageState = active lastTxCauseCode = 0 lastTxDiagCode = 00 lastRxCauseCode = 0 lastRxDiagCode = 00 currentConnections = 0 peakConnections = 0 successfulConnections = 0 failedConnections = 0 txPdus = 0 rxPdus = 0 currentPmpConnections = 0 peakPmpConnections = 0 successfulPmpConnections = 0 failedPmpConnections = 0 ok 2005-04-17 16:40:48.87