问一个AIX中路由的问题

ABAP/4

etstat -rn
Routing tables
Destination        Gateway           Flags     Refs     Use             If   
default            11.0.67.15         UG         16       12961393   en1      
11.0.67.0          10.0.67.1         UHSb      0         0              en1      
11.0.67/28         10.0.67.1        U            1       390            en1      
11.0.67.1          127.0.0.1         UGHS      0      793715        lo0

这个UG,UHSB,U都表示什么意思？  Refs都表示什么？  Use都表示什么？     

emperor9

Flags         The flags field of the routing table shows the state of the route:
A
An Active Dead Gateway Detection is enabled on the route. This field only applies to AIX® 5.1 or later.
U
Up.
H
The route is to a host rather than to a network.
G
The route is to a gateway.
D
The route was created dynamically by a redirect.
M
The route has been modified by a redirect.
L
The link-level address is present in the route entry.
c
Access to this route creates a cloned route.
W
The route is a cloned route.
1
Protocol specific routing flag #1.
2
Protocol specific routing flag #2.
3
Protocol specific routing flag #3.
b
The route represents a broadcast address.
e
Has a binding cache entry.
l
The route represents a local address.
m
The route represents a multicast address.
P
Pinned route.
R
Host or net unreachable.
S
Manually added.
u
Route usable.
s
The Group Routing stopsearch option is enabled on the route.
Direct routes are created for each interface attached to the local host.