Modifying Routing Attributes with Apply Clauses in Huawei Route-Policy

H12-821 By islever Editorial Last updated

Routing Policy and Routing Control

Short answer

ABCD The apply clause in a Huawei route-policy supports modifying OSPF cost type, IS-IS route level, BGP AS_Path, and general route cost.

Question

A node of a route-policy can contain multiple if-match and apply clauses. If a route matches a node, all apply clauses of the node are applied to the route. Which of the following routing information can be modified by configuring the apply clauses? (Choose all that apply.)
  1. OSPF cost type Correct Answer
  2. Level of IS-IS routes Correct Answer
  3. AS_Path attribute of BGP routes Correct Answer
  4. Cost of routes Correct Answer

Key Takeaways

Huawei route-policy apply clauses are versatile and can manipulate specific protocol-level attributes (like OSPF/IS-IS/BGP) as well as generic metric values like cost.

Learn how to use apply clauses in Huawei route-policies to modify key routing attributes including OSPF cost types, IS-IS levels, BGP AS_Paths, and route costs.

Common mistake: Candidates may overlook that 'apply' clauses extend beyond simple filtering to active modification of complex protocol-specific attributes, leading them to select only generic options like 'Cost'.

Expert Analysis

The question asks which routing attributes can be modified using the apply clauses within a route-policy node in Huawei VRP. A route-policy is a powerful tool for manipulating routing information, and its nodes can contain multiple if-match conditions followed by one or more apply actions.

Let's evaluate each option based on Huawei VRP documentation:

A. OSPF cost type: The apply ospf cost-type command allows you to modify the cost type (e.g., Type 1 or Type 2) of an OSPF route. This is a valid application.

B. Level of IS-IS routes: The apply level command enables the modification of the IS-IS route level (Level-1, Level-2, or Level-1-2). This is also supported.

C. AS_Path attribute of BGP routes: For BGP routes, the apply as-path command can be used to append, delete, or replace entries in the AS_Path attribute. This is a standard BGP policy action.

D. Cost of routes: The apply cost command allows direct modification of the administrative cost of a route, regardless of the protocol (though it's most commonly associated with IGP metrics like OSPF or IS-IS). This is definitely supported.

Since all four options represent valid parameters that can be manipulated via apply clauses in a Huawei route-policy, the correct answer includes all of them.

Official Reference

https://support.huawei.com/enterprise/en/doc/EDOC1000114965/7a3b7c5d/route-policy

This link opens the official vendor documentation in a new tab.

Exam Strategy

When facing questions about route-policy capabilities, remember that 'apply' clauses are not limited to setting simple metrics. They often allow deep manipulation of protocol-specific headers and attributes. If an option describes a specific attribute of a major routing protocol (OSPF, IS-IS, BGP), check if there is a corresponding apply command for it; usually, Huawei supports extensive modification capabilities.

Frequently Asked Questions

Can I modify both OSPF cost and cost type in the same route-policy node?

Yes, a single node in a route-policy can contain multiple apply clauses. You can use apply cost and apply ospf cost-type together to modify different aspects of an OSPF route.

Does applying these changes affect the local router's LSDB?

Modifications made via route-policies typically affect the routing table and how routes are advertised to neighbors, but they do not directly alter the Link State Database (LSDB) itself, which is maintained by the routing protocol process.

More H12-821 FAQ →

Community Votes

A
25%
B
25%
C
25%
D
25%

25% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 1 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 1

  1. HCIP Resolutor 👍 1
    En Huawei VRP, la cláusula apply de un objeto route-policy permite modificar los 4 parámetros listados

Reader comments & corrections

No reader corrections yet — spotted an error or have a note? Share it below.

Log in to comment, report an error, or add a note about this question.

IS-IS Supported Cost Types: Wide vs Narrow

S-grade

VRRP and BFD Integration Failover Behavior

S-grade

Multiple BGP Processes on a Single Router

S-grade

IS-IS IIH Circuit Type Values for Level-1-2 Routers

S-grade

Practice All H12-821 Questions

Access 168 questions with complete answers and detailed explanations.

View Full H12-821 Practice Test →

← Back to H12-821 Study Guide