参考答案: B
详细解析:
display bgp routing-table address-family vpnv4 是查看vpn的地址族路由信息，A错误。display bgp vpnv4 all routing-table 是查看VPN的路由信息，私网和vpnv4的都可以看到，B正确。display bgp routing-table ipv4-family vpnv4 查看IPV4单播路由信息，C错误。选项D格式错误，本题选B。
以下哪条命令可以被用来在PE上查看BGP VPNV4路由和BGP私网路由的信息?
A. display bgp routing-table address-family vpnv4
B. display bgp vpnv4 all routing-table
C. display bgp routing-table ipv4-family vpnv4
D. display vpnv4 bgp routing-table
参考答案: B
详细解析:
display bgp routing-table address-family vpnv4 是查看vpn的地址族路由信息，A错误。display bgp vpnv4 all routing-table 是查看VPN的路由信息，私网和vpnv4的都可以看到，B正确。display bgp routing-table ipv4-family vpnv4 查看IPV4单播路由信息，C错误。选项D格式错误，本题选B。