1、概念：不认识单播帧在冗余的二层链路上双向循环涣散构成双向环2、条件：冗余、不认识单播帧3、影响：MAC地址表的颤抖，通迅无法正常进行4、对策：思路－－逻辑上阻断冗余的链路
(1. Concept: Unrecognized unicast frames are bidirectionally cyclically scattered on redundant Layer 2 links to form a bidirectional ring. 2. Conditions: Redundant, unaware of unicast frames. 4. Countermeasures: ideas - logically block redundant links)
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