问题:
[多选题]26. 假设为简单的单播IP转发配置了基于帧的MPLS网络,网络中有四台路由器,分别为R1、R2、R3 和R4。这些路由器之间采用全网状连接方式,任意两台路由器之间都有直达链路。R1通过LDP将前缀 1.1.1.0/24及标签30宣告给了其他三台路由器,如果R2需要利用LDP将1.1.1.0/24的标签宣告给R1,那 么必须满足什么条件?
A.R2必须有去往1.1.1.0/24的路由
B.根据水平分割规则,R2不会向R1宣告标签
C.R2在学到去往1.1.1.0/24的路由之前可以将标签宣告给R1
D.R2在宣告标签之前必须利用MP-BGP学到去往1.1.1.0/24的路由
Tags:思科认证CCIE路由和交换分类模拟试题
答案解析:
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