在某运行MSTP协议的交换机设备上得到如图所示信息，请指出Ethernet1/0/13端口对于Instance1的端口状态是[SWC]displaystpbriefMSTIDPortRoleSTPStateProtection0Ethernet1/0/2DESIFORWARDINGNONE0Ethernet1/0/3DESIFORWARDINGNONE0Ethernet1/0/12ALTEDISCARDINGNONE0Ethernet1/0/13ROOTFORWARDINGNONE1Ethernet1/0/2DESIFORWARDINGNONE1Ethernet1/0/12ROOTFORWARDINGNONE1Ethernet1/0/13ALTEDISCARDINGNONE2Ethernet1/0/3DESIFORWARDINGNONE2Ethernet1/0/12ALTEDISCARDINGNONE2Ethernet1/0/13ROOTFORWARDINGNONE
（A）Forwarding
（B）Discarding
（C）ALTE
（D）NONE
参考答案
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