Asymmetric Routing with Static Routes on Huawei Routers

H12-811 By islever Editorial Last updated

IP Routing Basics Network Troubleshooting

Short answer

D Configures specific /30 static routes using next-hops 11.0.12.2 (via G0/0/3) and 11.0.12.5 (via G0/0/4) to enforce asymmetric routing between Host A and Host B.

Question

On the network shown in the figure, when planning traffic, the network administrator requires that the data packets sent from host A to host B pass through G0/0/3 on the router, and the packets sent from host B to host A pass through G0/0/4 on the router. Which of the following commands can be used to meet this requirement? (Choose all that apply.)
Exhibit: Asymmetric Routing with Static Routes on Huawei Routers
  1. Router A : ip route-static 0.0.0.0 0.0.0.0 11.0.12.2 Router B : ip route-static 0.0.0.0 0.0.0.0 11.0.12.5
  2. Router A : ip route-static 0.0.0.0 0.0.0.0 11.0.12.6 Router B : ip route-static 0.0.0.0 0.0.0.0 11.0.12.1
  3. Router A : ip route-static 10.0.12.5 255.255.255.252 11.0.12.6 Router B : ip route-static 10.0.12.1 255.255.255.252 11.0.12.1
  4. Router A : ip route-static 10.0.12.5 255.255.255.252 11.0.12.2 Router B : ip route-static 10.0.12.1 255.255.255.252 11.0.12.5 Correct Answer

Key Takeaways

Test-takers must match next-hop IPs to their physical interfaces to ensure traffic flows through the required ports, rather than relying on default routes.

Learn how to configure asymmetric routing on Huawei routers using static routes to force specific traffic paths through designated interfaces like G0/0/3 and G0/0/4.

Common mistake: Choosing default routes (Options A/B) which cause loops or lack specificity, or selecting Option C which directs traffic through the wrong interface.

Expert Analysis

The requirement is asymmetric routing: Host A to B via G0/0/3, and Host B to A via G0/0/4. This necessitates specific static routes on both routers targeting the remote network.

Option D Analysis:

  • Router A: ip route-static 10.0.12.5 255.255.255.252 11.0.12.2. The next-hop 11.0.12.2 is reachable via G0/0/3. The destination 10.0.12.5/30 (mask.252) correctly covers the /30 subnet of Host B's network (10.0.12.4/30). This forces traffic from A to B through G0/0/3.
  • Router B: ip route-static 10.0.12.1 255.255.255.252 11.0.12.5. The next-hop 11.0.12.5 is reachable via G0/0/4. The destination 10.0.12.1/30 correctly covers the /30 subnet of Host A's network (10.0.12.0/30). This forces traffic from B to A through G0/0/4.
  • Both commands are syntactically correct and meet the topology constraints.

Why Other Options Fail:

  • A & B: Default routes (0.0.0.0 0) create a routing loop or fail because the next-hops are not directly connected to the source router without an IGP. Furthermore, default routes do not provide the granular control needed for asymmetric path selection in this context.
  • C: Uses next-hop 11.0.12.1 on Router A. If 11.0.12.1 is on G0/0/4 (the wrong interface), this option fails the 'Host A to B' constraint.

Note on Comments: One comment claims options use host IPs instead of network addresses. However, in Huawei VRP, a /30 mask applied to a host IP effectively defines the correct subnet range. Option D is the only one that satisfies the interface path requirements.

Exam Strategy

When asked to route traffic through specific interfaces, always identify the IP address associated with that interface and use it as the next-hop. Verify that the destination prefix matches the remote network's subnet mask (e.g., /30) rather than guessing based on host IPs alone.

Frequently Asked Questions

Why can't we use default routes for asymmetric routing?

Default routes are too generic and often lead to routing loops if not carefully managed. They do not allow you to specify exactly which interface (G0/0/3 vs G0/0/4) a packet should exit.

Is it valid to use a host IP with a /30 mask?

Yes. In Huawei VRP, specifying a host IP with a subnet mask that covers its network (like /30) is a valid way to define a static route to that specific subnet.

More H12-811 FAQ →

Community Votes

A
67%
D
33%

67% of anonymous learners picked answer A. Votes are pick records left by other test-takers — they are not the verified answer.

Discussion 3 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 3

  1. Pezhan 👍 2 Answered A
    AD are possible.
  2. 4243643 👍 1 Answered D
    None of the options is correct. Options A and B configure only default routes, causing a routing loop between the two routers. Options C and D use host IP addresses (10.0.12.1 and 10.0.12.5) instead of the correct network addresses (10.0.12.0/30 and 10.0.12.4/30) in the static routes. To meet the requirement, Router A should route the 10.0.12.4/30 network via 11.0.12.2 (G0/0/3), and Router B should route the 10.0.12.0/30 network via 11.0.12.5 (G0/0/4).
  3. Heidorn 👍 1 Answered A
    AD are possible, without a IGP being specified, you cant use a interface not directly connected.

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