一、拓扑图
新加核心交换机在分中心，分别连区域中心上传路段视频，和路由器去映射内网手机发布服务器，远程手机查看视频，内网服务器必须上网。
二、问题描述
现在分中心上传区域中心视频正常，手机发布服务器不能上网，手机无法远程观看视频。
三、解决方案
查看核心交换机的静态路由器，发现默认路由指向区域分中心。核心交换机与路由器之间互联可以相互ping通，就是无法上网。
发现所有上网请求都被发往区域中心（默认路由的作用），增加一条指向路由器的默认路由，修改优先级为50，（默认60）
配置代码如下：
[GLZX_hexin_s5700]ip route-static 0.0.0.0 0.0.0.0 172.16.10.1 preference 50
[GLZX_hexin_s5700]ping 218.30.67.83 （上网正常）
PING 218.30.67.83: 56 data bytes, press CTRL_C to break
Reply from 218.30.67.83: bytes=56 Sequence=1 ttl=120 time=49 ms
Reply from 218.30.67.83: bytes=56 Sequence=2 ttl=120 time=49 ms
Reply from 218.30.67.83: bytes=56 Sequence=3 ttl=120 time=49 ms
Reply from 218.30.67.83: bytes=56 Sequence=4 ttl=120 time=49 ms
Reply from 218.30.67.83: bytes=56 Sequence=5 ttl=120 time=48 ms
--- 218.30.67.83 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 48/48/49 ms
[GLZX_hexin_s5700]quit
<GLZX_hexin_s5700>sa
<GLZX_hexin_s5700>save （保存）
The current configuration will be written to the device.
Are you sure to continue?[Y/N]y
Now saving the current configuration to the slot 0.
Save the configuration successfully.
<GLZX_hexin_s5700>ping www.baidu.com (域名ping不通)
Error: Unknown host www.baidu.com.
<GLZX_hexin_s5700>sys
<GLZX_hexin_s5700>system-view
Enter system view, return user view with Ctrl+Z.
[GLZX_hexin_s5700]dns server 118.118.118.9 （设置DNS）
[GLZX_hexin_s5700]
[GLZX_hexin_s5700]dns resolve （启用解析）
[GLZX_hexin_s5700]ping www.baidu.com （百度正常）
PING www.a.shifen.com (14.215.177.38): 56 data bytes, press CTRL_C to break
Reply from 14.215.177.38: bytes=56 Sequence=1 ttl=55 time=33 ms
Reply from 14.215.177.38: bytes=56 Sequence=2 ttl=55 time=33 ms
Reply from 14.215.177.38: bytes=56 Sequence=3 ttl=55 time=33 ms
Reply from 14.215.177.38: bytes=56 Sequence=4 ttl=55 time=33 ms
Reply from 14.215.177.38: bytes=56 Sequence=5 ttl=55 time=33 ms
--- www.a.shifen.com ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 33/33/33 ms
[GLZX_hexin_s5700]clock timezone BJ add 8 （设置时区）
[GLZX_hexin_s5700]dis ntp-service status （查看NTP状态）
clock status: unsynchronized
clock stratum: 16
reference clock ID: none
nominal frequency: 60.0002 Hz
actual frequency: 60.0002 Hz
clock precision: 2^17
clock offset: 0.0000 ms
root delay: 0.00 ms
root dispersion: 0.00 ms
peer dispersion: 0.00 ms
reference time: 00:00:00.000 UTC Jan 1 1900(00000000.00000000)
[GLZX_hexin_s5700]ntp-service unicast-server 202.120.2.101
[GLZX_hexin_s5700]
Oct 1 2008 16:37:58+08:00 GLZX_hexin_s5700 %%01NTP/4/PEER_SELE(l)[2]:The peer selected by the system is 202.120.2.101.
[GLZX_hexin_s5700]dis clock （显示时间，发现时间已经校准）
2016-12-21 12:48:13+08:00
Wednesday
Time Zone(BJ) : UTC+08:00
[GLZX_hexin_s5700]quit
<GLZX_hexin_s5700>save
The current configuration will be written to the device.
Are you sure to continue?[Y/N]y
Dec 21 2016 12:48:34+08:00 GLZX_hexin_s5700 %%01CFM/4/SAVE(l)[5]:The user chose Y when deciding whether to save the configuration to the device.
Now saving the current configuration to the slot 0..
Save the configuration successfully.
<GLZX_hexin_s5700>
至此，问题解决。