静态路由现象，详情看配置 无对端路由配置，静态只配置了这两条

interface Serial2/2/0/40:0

 link-protocol ppp

 ip address 172.30.243.153 255.255.255.252

#

 ip route-static 172.30.149.144 255.255.255.248 172.30.243.154

interface Serial3/2/0/38:0

 link-protocol ppp

 ip address 172.30.243.145 255.255.255.252

ip route-static 172.30.149.152 255.255.255.248 172.30.243.146

172.30.243.146/32   Direct 0    0            172.30.243.146  S3/2/0/38:0

                    Direct 0    0            172.30.243.146  S2/2/0/40:0

172.30.149.152/29   Static 60   0            172.30.243.146  S3/2/0/38:0

                    Static 60   0            172.30.243.146  S2/2/0/40:0

ping 172.30.243.154

  PING 172.30.243.154: 56  data bytes, press CTRL_C to break

    Request time out

    Request time out

    Request time out

ping 172.30.243.146

  PING 172.30.243.146: 56  data bytes, press CTRL_C to break

    Reply from 172.30.243.146: bytes=56 Sequence=1 ttl=255 time=4 ms

    Reply from 172.30.243.146: bytes=56 Sequence=2 ttl=255 time=6 ms

    Reply from 172.30.243.146: bytes=56 Sequence=3 ttl=255 time=4 ms

    Reply from 172.30.243.146: bytes=56 Sequence=4 ttl=255 time=5 ms

    Reply from 172.30.243.146: bytes=56 Sequence=5 ttl=255 time=5 ms

ping 172.30.149.150

  PING 172.30.149.150: 56  data bytes, press CTRL_C to break

    Reply from 172.30.149.150: bytes=56 Sequence=1 ttl=255 time=4 ms

    Reply from 172.30.149.150: bytes=56 Sequence=2 ttl=255 time=4 ms

    Reply from 172.30.149.150: bytes=56 Sequence=3 ttl=255 time=4 ms

    Reply from 172.30.149.150: bytes=56 Sequence=4 ttl=255 time=12 ms

    Reply from 172.30.149.150: bytes=56 Sequence=5 ttl=255 time=4 ms

ping 172.30.149.158

  PING 172.30.149.158: 56  data bytes, press CTRL_C to break

    Request time out

    Reply from 172.30.149.158: bytes=56 Sequence=2 ttl=255 time=6 ms

    Request time out

    Reply from 172.30.149.158: bytes=56 Sequence=4 ttl=255 time=5 ms

    Request time out