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