The function of routing protocol priority is to assign different priorities to the routes discovered by different protocols, so that when a router learns the same route from different routing protocols at the same time, it can have a priority order of selection.

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By default, VRP automatically aggregates routes imported by BGP.

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OSPF divides the boundary of the area on the router.

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The ABR in the OSPF STUB area does not flood Type 5 LSA, Type 4 LSA, and Type 3 LSA into the STUB area. Therefore, the STUB area does not have AS external routing capabilities. The ABR in the STUB area advertises a default route to the area, guiding to send to destination outside the AS.

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OSPF runs directly on top of the TCP protocol, using TCP port number 179.

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If the Router Priority is set to 0, then in the OSPF routing domain, the router is allowed to be elected as DR or BDR, but with the lowest priority.

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There can be multiple nodes under one ROUTE-POLICY, different node numbers are identified by sec-number, and the relationship between the various parts of different seq-numbers is an "or" relationship.

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Different network types of the OSPF protocol can form an adjacency in the FULL state.

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Using default routing between routers is a low-cost solution, but requires more system resources than a complete routing table.

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The AS border router can be an internal router IR or ABR, and must belong to the backbone area.

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