Huawei Quidway S8500 Series Command Manual page 288

Command Manual – Routing Protocol
Quidway S8500 Series Routing Switches
Field
State
Route state description:
ActiveU Valid unicast route. U stands for unicast.
Blackhole route is similar to Reject route, but it will not
Blackhole
send the ICMP unreachable message to the source end
Delete The route is deleted
Gateway Indicates that the route is not directly reachable
The route exists, but it is unavailable temporarily for
some reasons (e.g., configured policy or interface is
Hidden Down). Moreover, you do not wish to delete it.
Therefore, you need to hide it, so as to restore it again
later
Holddown is one kind of route redistribution policy
adopted by some distance-vector (D-V) routing
protocols (e.g., RIP), through which these routing
protocols can avoid the flooding of error routes and
Holddown deliver the routing unreachable message accurately.
For example, the RIP imports a certain route every a
period of time regardless of whether the actually found
routes destined for the same destination change. For
more details, refer to the specific routing protocols.
The route is discovered by interior gateway protocol
Int
(IGP).
The routing protocol does not import NoAdvise route
NoAdvise
when it imports routes based on the policy.
The routing protocol generally selects the route with the
highest precedence from its routing table, then places it
NotInstall in its core routing table and imports it. Although the
NotInstall route cannot be placed in the core routing
table, it is possibly that it is selected and imported.
Unlike the normal routes, the Reject route will discard
the packets that select it as their route, and the router
Reject
will send ICMP unreachable message to the source
end. Reject route is usually used for the network test
When the routes from the core routing table are
deleted, the routes with the Retain flag will not be
Retain deleted. Using this function you can set the Retain flag
for some static routes, so that they can exist in the core
routing table.
The route with Static flag will not be cleared from the
routing table after you save it and reboot the router.
Static
Generally, the static route configured manually in the
router belongs to a Static route.
Unicast Unicast route
Huawei Technologies Proprietary
1-5
Chapter 1 Static Route Configuration Commands
Description