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A12-66 893-741-B
Internet Protocol (IP) Routing
Flags The following three flags:
First flag
(Status)
U
Q
D
The route is valid (up) and in use.
The route is valid but the interface is quiescent, i.e., the
interface is not up yet or was brought down by expiration of
the timer set by the net_inactivity port parameter.
The route is invalid (down) and has a metric of 16 (RIP
infinity). It will stay in the routing table for two more
minutes so that other routers can learn that it is invalid.
Second flag
(Source)
C
I
R
S
The route was learned via an ICMP redirect. This can occur
only when IP routing is disabled (by setting the routed
parameter to N).
The route is an interface route.
The route was learned via RIP.
The route is a static route, learned from a route you defined
in the gateway section of the config.annex file or a route
you entered via the CLI superuser route command.
Third flag
H The route is a hardwired static route.
Usage A positive or negative integer indicating a route’s usage.
When RIP adds a route to the routing table, it sets its usage
value to 0. Every time the route is used, RIP adds 1 to this
value. And every thirty seconds, RIP subtracts one from the
value. When the routing table reaches its maximum size of
256 entries, RIP removes the route with the lowest usage
value. If there is a tie, the first route listed is deleted. The
range of values is –9999999, for a route that has not been
used in 9.5 years, to +9999999, for a very frequently used
route. Interface, hardwired, and extremely frequently used
routes contain the word fixed in this field instead of a
number.
Table A12-11. IP Fields in netstat -r Display (continued)
Field Explanation