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r1 is the hub ， multipoint mode subinterface， r2 and r3 is spoke， when r2 down at the spoke， What will r1 react？how about r3？
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问答题r1 is the hub ， multipoint mode subinterface， r2 and r3 is spoke， when r2 down at the spoke， What will r1 react？how about r3？
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