Huawei H12-891_V1.0 Exam With Confidence Using Practice Dumps

In SR-MPLS (Segment Routing over MPLS), prefix SID conflicts may occur if multiple prefixes are assigned the same SID or vice versa.

Conflict resolution principle (Huawei standard):

When there are multiple SIDs for the same prefix, the SID with the lowest value wins.

When the same SID is assigned to multiple prefixes, the prefix with the smallest address wins.

Apply to this case:

Conflict: Two entries for 1.1.1.1/32 with SID 2 and SID 1.

SID 1 is lower, so 1.1.1.1/32 → SID 1 is selected.

Correct answer: D. 1.1.1.1/32 → SID 1

The basic constructs in YANG data modeling include:

Leaf node – A single data element with a specific type (e.g., integer, string).

List node – A repeating set of elements, each structured the same.

Incorrect options:

A. Set node – ❌ Not a valid YANG construct.

D. Tree node – ❌ Not an individual data model element. The entire model forms a tree structure, but there is no “tree node” in YANG syntax.

Exact Extract – Huawei YANG Modeling Fundamentals:

“YANG defines elements such as leaf, list, container, choice, and leaf-list. ' Set ' and ' tree ' are not YANG node types.”

In OSPFv3, Link-LSA (Type 8) is generated by a router for each of its interfaces to advertise:

The router ' s link-local address on that interface.

The IPv6 prefixes associated with the interface.

Flags and options, such as router priority or loopback indicators.

From the output:

Link-LSA (Interface GigabitEthernet0/0/0)

Originating Router: 10.1.2.2

Link-Local Address: FE80::2E0:FCFF:FECD:4F79

Prefix: 2001:DB8:2345:23::/64

A. The link-local address of R2’s GE0/0/0 is FE80::2E0:FCFF:FECD:4F79→ This matches the Link-Local Address field in the LSA. ✅

B. The IPv6 address prefix of R2’s GE0/0/0 is 2001:DB8:2345:23::/64→ This matches the Prefix field in the LSA. ✅

C. This LSA indicates that R2 does not support external routes but can participate in IPv6 route calculation→ ❌ Incorrect.

The Link-LSA does not provide any indication about external route capabilities.

It simply advertises interface-specific IPv6 and link-local info.

Whether R2 supports external routes depends on Type 5 (External) or Type 7 (NSSA) LSAs, not Link-LSAs.

D. This LSA is generated by R2→ The Originating Router: 10.1.2.2 is R2’s router ID, so this LSA is definitely generated by R2. ✅

Correct Answers: A, B, D

The Link-LSA in OSPFv3 contains:

The link-local address used by the originating router on the link.

A list of all IPv6 prefixes associated with the link.

Flags such as router priority and the Router-LSA options.

These LSAs are always generated by the router itself and are not flooded beyond the link.