单选题 在电信IPRAN配置规范里,关于bgp配置描述正确的是 bgp 100 router-id 100.0.0.3 peer 100.0.0.11 as-number 100 peer 100.0.0.11 connect-interface LoopBack0 peer 100.0.0.11 tracking delay 30 # ipv4-family unicast undo synchronization undo peer 100.0.0.11 enable # ipv4-family vpnv4 policy vpn-target peer 100.0.0.11 enable