tracerout丢包问题

bjzeniit

实验环境如下：

R1 e0/0:12.12.12.1/24 Lo 0:1.1.1.1/24
R2 e0/0:12.12.12.2/24 Lo 0:2.2.2.2/24。。
使用ping测试 ping 2.2.2.2 source 1.1.1.1 没有丢包现象。
但是，执行命令：
R1#traceroute 2.2.2.2 source 1.1.1.1

Type escape sequence to abort.
Tracing the route to 2.2.2.2

1 12.12.12.2 40 msec *  12 msec
出现丢包情况，动态路由协议是Rip V2.详细配置如下：
R1#sho run
Building configuration...

Current configuration : 774 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
no ip domain lookup
!
!         
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface Ethernet0/0
ip address 12.12.12.1 255.255.255.0
half-duplex
!
interface Ethernet0/1
no ip address
shutdown
half-duplex
!
interface Ethernet0/2
no ip address
shutdown
half-duplex
!
interface Ethernet0/3
no ip address
shutdown
half-duplex
!
router rip
version 2
network 1.0.0.0
network 0.0.0.0
no auto-summary
!
no ip http server
!
!
!
!
!
control-plane
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
end      
R2的配置：
R2#sho run
Building configuration...

Current configuration : 774 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
memory-size iomem 5
!
!
ip cef
!
!
no ip domain lookup
!
!         
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.0
!
interface Ethernet0/0
ip address 12.12.12.2 255.255.255.0
half-duplex
!
interface Ethernet0/1
no ip address
shutdown
half-duplex
!
interface Ethernet0/2
no ip address
shutdown
half-duplex
!
interface Ethernet0/3
no ip address
shutdown
half-duplex
!
router rip
version 2
network 2.0.0.0
network 0.0.0.0
no auto-summary
!
no ip http server
!
!
!
!
!
control-plane
!
!
line con 0
exec-timeout 0 0
logging synchronous
line aux 0
line vty 0 4
!
end   
怎么解决？？？？？？？？？？？？