MP-BGP必须要使能mpls才可以传递路由信息吗？

1和2已成功建立ibgp vpnv4邻居，由于是直连不存在路由黑洞的问题。现在1和2分别将直连路由（vrf）传递给对方，发现不在互联接口使能mpls enable，彼此是无法学习到本地通告的直连路由，请问vpnv4的邻居关系已经建立成功，为什么还需要使能mpls才可以传递路由？

1配置：

ip vpn-instance 1 route-distinguisher 3:3 vpn-target 1:1 import-extcommunity vpn-target 10:10 export-extcommunity 

bgp 100 peer 2.2.2.2 as-number 100 

 peer 2.2.2.2 connect-interface LoopBack0 

 # address-family vpnv4 peer 2.2.2.2 enable # 

 ip vpn-instance 1 #

 address-family ipv4 unicast 

 network 10.1.1.0 255.255.255.0 

2配置：

ip vpn-instance 1 route-distinguisher 22:2 vpn-target 10:10 import-extcommunity vpn-target 1:1 export-extcommunity 

bgp 100 peer 1.1.1.1 as-number 100

 peer 1.1.1.1 connect-interface LoopBack0 #

 address-family vpnv4 peer 1.1.1.1 enable # 

 ip vpn-instance 1 #

 address-family ipv4 unicast 

 network 20.1.1.0 255.255.255.0 # 

1路由表：

dis bgp routing-table vpnv4 BGP local router ID is 1.1.1.1 Status codes: * - valid, > - best, d - dampened, h - history, s - suppressed, S - stale, i - internal, e - external Origin: i - IGP, e - EGP, ? - incomplete Route distinguisher: 3:3(1) Total number of routes: 1

 Network NextHop MED LocPrf PrefVal Path/Ogn * > 10.1.1.0/24 10.1.1.1 0 32768 i 

2路由表（由于在1的互联接口上使能过mpls，所以2学习到了1发布的路由）：

BGP local router ID is 2.2.2.2 Status codes: * - valid, > - best, d - dampened, h - history, s - suppressed, S - stale, i - internal, e - external Origin: i - IGP, e - EGP, ? - incomplete Total number of routes from all PEs: 1 Route distinguisher: 3:3 Total number of routes: 1 Network NextHop MED LocPrf PrefVal Path/Ogn * >i 10.1.1.0/24 1.1.1.1 0 100 0 i Route distinguisher: 22:2(1) Total number of routes: 2 Network NextHop MED LocPrf PrefVal Path/Ogn * >i 10.1.1.0/24 1.1.1.1 0 100 0 i * > 20.1.1.0/24 20.1.1.2 0 32768 i