多选题Ring check主要用于检测和消除用户侧的环网，Ring check报文格式描述正确的是哪些？（）ADMAC为ONT系统MACBSMAC为桥MACCDMAC为广播MAC值为0xFFDSMAC为ONT系统MAC
多选题
Ring check主要用于检测和消除用户侧的环网，Ring check报文格式描述正确的是哪些？（）
A
DMAC为ONT系统MAC
B
SMAC为桥MAC
C
DMAC为广播MAC值为0xFF
D
SMAC为ONT系统MAC
参考解析
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