3Com 5500G-EI Command Reference Guide - Page 149

Routing Table Display Commands 149 Table 18 Output Description of the ip routing-table acl verbose Command Field State Age Cost Description Route state desription: ActiveU - The route is selected and is optimum Blackhole - Blackhole route is similar to Reject route, but it will not send the ICMP unreachable message to the source end Delete - The route is deleted Gateway - Identifies that the route is not an interface route Hidden - The route exists, but it is unavailable temporarily for some reasons (e.g., configured policy or interface is Down). Moreover, you do not wish to delete it. Therefore, you need to hide it, so as to restore it again later Holddown - 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 deliver the routing unreachable message accurately. For example, the RIP redistributes 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 Int - The route is discovered by interior gateway protocol (IGP) NoAdvise - The routing protocol does not redistribute NoAdvise route when it redistributes routes based on the policy NotInstall - The routing protocol generally selects the route with the highest precedence from its routing table, then places it in its core routing table and redistributes it. Although the NotInstall route cannot be placed in the core routing table, it is possibly that it is selected and redistributed Reject - Unlike the normal routes, the Reject route will discard the packets that select it as their route, and the router will send ICMP unreachable message to the source end. Reject route is usually used for the network test Retain - When the routes from the routing table are deleted, the routes with Retain flag will not be deleted. Using this function you can set Retain flag for some static routes, so that they can exist in the core routing table Static - The route with Static flag will not be cleared from the routing table after you save it and reboot the router. Generally, the static route configured manually in the router belongs to a Static route Unicast - Unicast route Time to live Value of cost display ip routing-table ip_address Syntax display ip routing-table ip_address [ mask ] [ longer-match ] [ verbose ] View All views Parameters ip_address Enter the destination IP address.