H12-821_V1.0 · Question #858
When running OSPFv3 on a Huawei router, the OSPFv3 process will automatically select an interface address as the Router ID of the process.
The correct answer is B. FALSE. B is correct because OSPFv3, despite running over IPv6, still uses a 32-bit Router ID - identical in format to an IPv4 address. On Huawei routers, OSPFv3 cannot automatically derive this from an IPv6 interface address; the Router ID must be explicitly configured with the…
Question
Options
- ATRUE
- BFALSE
How the community answered
(50 responses)- A30% (15)
- B70% (35)
Explanation
B is correct because OSPFv3, despite running over IPv6, still uses a 32-bit Router ID - identical in format to an IPv4 address. On Huawei routers, OSPFv3 cannot automatically derive this from an IPv6 interface address; the Router ID must be explicitly configured with the router-id command, or the process will borrow an existing IPv4 address (e.g., from a loopback) if one is available. If neither a manual Router ID nor any IPv4 address exists on the device, the OSPFv3 process will fail to start.
Why A is wrong: OSPFv3 never selects an IPv6 interface address as the Router ID - they are incompatible types (128-bit IPv6 vs. 32-bit RID). The assumption that OSPFv3 "automatically" handles this the way some expect is a common misconception.
Memory tip: "v3 runs on v6, but its ID stays v4-shaped." OSPFv3 modernized the routing protocol for IPv6 networks but kept the 32-bit Router ID convention - so there's no IPv6 address to "auto-pick," and manual configuration is required on Huawei devices.
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