What is a direct route for S series switches


Direct route: indicates the route of a subnet connected by a router interface. The interface and its connected subnet are in the same network segment, so the direct route always serves as the network segment route of the outbound interface. Direct routes are discovered by link-layer protocols and indicate routes that are in the same network segment as the interface address of a router. The routes are not maintained by network administrators and not obtained by a router using a certain algorithm. As long as the interface is active, the router writes the routing information of the network segment to the routing table. Direct routes cannot make a router obtain routes which are not directly connected to the router.

Other related questions:
S series switch routing table specification
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Why does the switch not select a direct route as the optimal route
By default, the switch selects routes in the following order: Longest mask > route preference > route cost When a direct route is not selected as the optimal route, check whether the switch has imported an external route with a longer mask than the direct route. If such a route exists, check whether the switch imports the more exact external route. This may be caused by incorrect routing configuration.

Routes imported into IS-IS are invalid on S series switches
Q: Why are routes imported into IS-IS invalid? A: For S series switches supporting IS-IS, if the IS-IS level is not set when routes are imported into IS-IS, level-2 IS-IS is used by default. That is, routes are imported into level-2 IS-IS. To import routes to areas of other levels, specify the area level.

Configure the priority of an OSPF route on an S series switch
The routing protocols may share and select the routing information because a switch may run multiple dynamic routing protocols simultaneously. In this case, a priority should be set for each routing protocol. When different protocols find multiple routes to the same destination, the route discovered by the protocol with a higher priority is preferred. On an S series switch, you can run the preference command in the OSPF process view to configure the OSPF priority. Perform the following operations: 1. Run the ospf [ process-id ] command in the system view to enter the OSPF process view. 2. Run the preference [ ase ] { preference | route-policy route-policy-name } * command to configure the OSPF priority. The parameters are described as follows: ase: indicates the priority of the AS-External route. preference: indicates the OSPF route priority. A smaller value indicates a higher priority. route-policy route-policy-name: indicates the priority for specified routes in the routing policy. The default OSPF priority value is 10. When an ASE is specified, the default OSPF priority is 150. For example, set the priority of routes in OSPF process 100 to 150 as follows: [HUAWEI] ospf 100 [HUAWEI-ospf-100] preference 150

Whether S series switches support bandwidth reservation at outbound direction of interface
S series switch (except S1700) switch does not support bandwidth reservation of interface, but can improve the priority of a specific message through the queue of flow, to ensure that the specific types of messages be sent out.

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