CISCO7507与华为Quidway2501通过2条E1如何做捆绑？

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CISCO7507与华为Quidway2501通过2条E1如何做捆绑？

我做了如下配置，但线路协议总是down，不做捆绑2条E1只有一根通，奇怪？
Quidway2501配置：
   user 2501 service-type ppp password 0 2501
    router id 192.168.1.2
    multilink-user 2501 bind Virtual-Template1
    hostname qr2501_zjyc_router
  !
  interface Ethernet0
    ip address 10.78.139.1 255.255.255.0
    ip ospf enable area 0.0.0.2
    ip ospf cost 100
  !
  interface Serial0
    clock-select DTECLK1
    encapsulation ppp
    ppp authentication  pap
    ppp multilink
    ppp pap sent-username 2501 password  0 2501
  !
  interface Serial1
    clock-select DTECLK1
    encapsulation ppp
    ppp authentication  pap
    ppp multilink
    ppp pap sent-username 2501 password  0 2501
  !
  interface Serial2
    flowcontrol normal
    async mode dedicated
    encapsulation ppp                 
!
  interface Virtual-Template1
    ip address 172.16.16.6 255.255.255.252
    ip ospf enable area 0.0.0.2
    ip ospf neighbor 172.16.16.5
    ip ospf network-type point-to-point
  !
  exit
  router ospf enable
    stub cost 100 area 0.0.0.2
  !
  end            
   
CISCO7507配置：

interface Multilink2
description to zjyc
bandwidth 4000
ip address 172.16.16.5 255.255.255.252
no ip redirects
no ip proxy-arp
ppp authentication  pap
ppp pap sent-username 2501 password  0 2501
ppp multilink
multilink-group 2

interface Serial5/0/1:0
bandwidth 2000
no ip address
no ip redirects
no ip proxy-arp
encapsulation ppp
service-policy output acl-out
ppp authentication  pap
ppp pap sent-username 2501 password  0 2501
ppp multilink
multilink-group 2

interface Serial5/0/2:0
bandwidth 2000
no ip address
no ip redirects
no ip proxy-arp
encapsulation ppp
service-policy output acl-out
ppp authentication  pap
ppp pap sent-username 2501 password  0 2501
ppp multilink
multilink-group 2