问如果BGP同步功能打开172.2.0.0/24的条目能否出现在路由器C上？ 
正确答案:
If BGP routes do not redistribute into IGP of AS y， router C will not learn the routs .Because of BGP synchronization rule ，the route can’t be advertised to RC by RB.If BGP routes is redistributed into IGP of AS y by RA， routerB will advertise the learned BGP routes to RC，because now the routes is known via IGP.
答案解析:有
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