多项选择题
A.路由器没有动态路由B.路由相关接口没有启用PIM协议C.上游路由器丢弃收到的GRAF报文D.接收者路由器丢弃收到的IGMP REPORT
A.display ospf cumulative B.display ospf spf-statistics C.display ospf global-statics D.display ospf request-queue
A.RIP B.ISIS C.OSPF D.BGP