PPP链路与帧中继链路相连丢包严重

Necui

这个实验是在GNS3上做的，路由器用的C7200，版本是12.4(24)T, RELEASE SOFTWARE (fc1)；
R2、R3之间使用PPP封装，并使用chap认证，之间通信正常，无丢包现象；
R4为帧中继交换机，R3、R5为客户端，之间通信正常，无丢包现象；
但是，用 R2 ping R5 丢包非常严重，求大神解答，为何会丢包？

拓扑：


ping 截图：





配置：
R2（部分）：
interface Multilink1
ip address 23.1.1.2 255.255.255.0
ppp chap hostname ruijie
ppp chap password 7 104D000A0618
ppp multilink
ppp multilink group 1
!
interface FastEthernet0/0
ip address 12.1.1.2 255.255.255.0
duplex half
!
interface Serial1/0
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink
ppp multilink group 1
!
interface Serial1/1
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink
ppp multilink group 1
!
router ospf 1
router-id 2.2.2.2
log-adjacency-changes
network 12.1.1.0 0.0.0.255 area 0
network 23.1.1.0 0.0.0.255 area 0
!

R3（部分）：
username ruijie password 7 030752180500



interface Multilink1
ip address 23.1.1.3 255.255.255.0
ppp authentication chap
ppp multilink
ppp multilink group 1
!
   
interface Serial1/0
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink
ppp multilink group 1
!
interface Serial1/1
no ip address
encapsulation ppp
serial restart-delay 0
ppp multilink
ppp multilink group 1
!
interface Serial1/2
ip address 35.1.1.3 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
serial restart-delay 0
no arp frame-relay
frame-relay map ip 35.1.1.5 305 broadcast
no frame-relay inverse-arp
!         
router ospf 1
router-id 3.3.3.3
log-adjacency-changes
network 23.1.1.0 0.0.0.255 area 0
network 35.1.1.0 0.0.0.255 area 0



R4（部分）：
no ip routing
frame-relay switching
!

interface Serial1/0
no ip address
encapsulation frame-relay
no ip route-cache
serial restart-delay 0
frame-relay lmi-type cisco
frame-relay intf-type dce
frame-relay route 503 interface Serial1/2 305
!
interface Serial1/1
no ip address
no ip route-cache
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
encapsulation frame-relay
no ip route-cache
serial restart-delay 0
frame-relay lmi-type cisco
frame-relay intf-type dce
frame-relay route 305 interface Serial1/0 503
!


R5（部分）：
interface Serial1/0
ip address 35.1.1.5 255.255.255.0
encapsulation frame-relay
ip ospf network point-to-point
serial restart-delay 0
no arp frame-relay
frame-relay map ip 35.1.1.3 503 broadcast
no frame-relay inverse-arp
!
router ospf 1
router-id 5.5.5.5
log-adjacency-changes
network 35.1.1.0 0.0.0.255 area 0
network 56.1.1.0 0.0.0.255 area 0

Necui

自己顶一下