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