三层交换机有 1 条路由看不明白

<S9303>dis ip rou

Route Flags: R - relay, D - download to fib

Routing Tables: Public
Destinations : 11 Routes : 11

Destination/Mask Proto Pre Cost Flags NextHop Interface

0.0.0.0/0   Static  60   0          RD   121.13.38.17    Vlanif1

121.13.38.16/28 Direct 0 0 D 121.13.38.24 Vlanif1
121.13.38.24/32 Direct 0 0 D 127.0.0.1 Vlanif1
121.13.38.31/32 Direct 0 0 D 127.0.0.1 Vlanif1 #这条路由我一直想不明白是怎么回事。
121.13.83.32/28 Direct 0 0 D 121.13.83.33 Vlanif1 #121.13.38.32/28的网段是下发网关在我们交换机上
121.13.83.33/32 Direct 0 0 D 127.0.0.1 Vlanif1
121.13.83.47/32 Direct 0 0 D 127.0.0.1 Vlanif1
127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
127.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0
255.255.255.255/32 Direct 0 0 D 127.0.0.1 InLoopBack0

<S9303>dis int vlan 1
Vlanif1 current state : UP
Line protocol current state : UP
Last line protocol up time : 2014-11-24 22:54:08
Description:
Route Port,The Maximum Transmit Unit is 1500
Internet Address is 121.13.38.24/28
Internet Address is 121.13.83.33/28 Sub
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is e468-a3a7-b732
Current system time: 2015-01-13 13:55:02
Input bandwidth utilization : --
Output bandwidth utilization : --

<S9303>arp ip 121.13.38.31
Error: Local IP Address!

<S9303>ping 121.13.38.31 #只有我们交换机内能ping通外界无法ping通这个IP
PING 121.13.38.31: 56 data bytes, press CTRL_C to break
Reply from 121.13.38.31: bytes=56 Sequence=1 ttl=255 time=1 ms
Reply from 121.13.38.31: bytes=56 Sequence=2 ttl=255 time=1 ms
Reply from 121.13.38.31: bytes=56 Sequence=3 ttl=255 time=1 ms
Reply from 121.13.38.31: bytes=56 Sequence=4 ttl=255 time=1 ms
Reply from 121.13.38.31: bytes=56 Sequence=5 ttl=255 time=1 ms

--- 121.13.38.31 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 1/1/1 ms