The Protocol Trace function of iMaster NCE-CampusInsight allows O & M teams to analyze the full packet exchange process (e.g., DHCP, authentication, IP acquisition) between clients and the network. In this scenario, it helped pinpoint DHCP address pool exhaustion as the cause.
Exact Extract - Huawei iMaster NCE-CampusInsight Product Documentation:
"The Protocol Trace function visualizes packet-level interaction processes for DHCP, ARP, 802.1X, and others, allowing fast identification of root causes for network access issues." Reference:
Huawei NCE-CampusInsight User Guide
HCIE-Datacom Campus Network O & M Chapter

Comprehensive and Detailed In-Depth Explanation:
To supportSR-MPLS (Segment Routing over MPLS),OSPFusesType 10 Opaque LSAsto advertiseSegment Routing (SR) capabilities and information.
Type 10 Opaque LSA (B): Used fordistributing application-specific informationwithin an OSPF area. In SR- MPLS, it carries theSID/Label mappingsand other SR-related information.
Type 7 NSSA External LSA (A):Used to advertise external routes within an NSSA, not related to SR-MPLS.
Type 1 Router LSA (C):Advertises the router's interfaces and links but does not carry SR-specific information.
Type 2 Network LSA (D):Advertises the links of abroadcast or NBMA network, not used for SR-MPLS.
Therefore, the correct answer isB (Type 10 Opaque LSA), as it enables theadvertisement of SR information.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei SR-MPLS Configuration Guide
RFC 8665: Segment Routing with OSPFv2

Before performing anetwork cutover (migration or upgrade), it is essential to collectbaseline datato ensure that services operate normally before and after the change.
Importance of Pre-Cutover Information Collection:
Identifies Network Baseline- Helps comparepre-cutover and post-cutover performance.
Detects Hidden Issues- Ensures that no existing network issues interfere with the cutover process.
Prevents Service Interruptions- Ensures all dependent services are accounted for.
Provides Rollback Plan- If issues arise, administrators canrestore previous configurations.
Reference from Huawei HCIE-Datacom Documentation:
Huawei Network Change Management Guide - Pre-Cutover & Post-Cutover Best Practices HCIE-Datacom Training Material - Service Assurance & Risk Analysis

Comprehensive and Detailed In-Depth Explanation:
The traceroute output shows that the path from R1 to the destination 172.17.1.5 is looping. After reaching the IP 10.1.13.1, the path goes back to 10.1.12.2, repeating the previous hops. This indicates a routing loop, where R1 continuously forwards packets through a circular path, never reaching the destination. Routing loops typically occur due to inconsistent or incorrect routing table entries, often because of routing protocol misconfigurations.
Reference:
Huawei HCIE Datacom Official Certification Guide
Huawei Routing and Switching Troubleshooting Guide

Understanding BGP EVPN Route Types for VXLAN
#BGP EVPN (Ethernet VPN) is used for VXLAN control-plane learning.
#EVPN Type 2 Route (MAC/IP Advertisement)
Carries:MAC + Host IP
Used for:L2 forwarding, Host Mobility
#EVPN Type 5 Route (IP Prefix Advertisement)
Carries:Network segment (Subnet) + Prefix
Used for:VXLAN L3 routing
#What Do the Given Route Entries Show?
0:172.16.2.0/24
0:172.16.13.0/24
0:192.168.122.0/30
#These are IPv4 Subnets, NOT individual MACs.
#Since they carry IP Prefixes, they belong to EVPN Type 5.
Analysis of the Answer Choices:
#A. These routes are Type 5 routes and carry network segment or mask information.
Correct:The displayed routescarry network prefixes, which belong toEVPN Type 5.
#B. These routes are Type 2 routes and carry host IP addresses.
Incorrect:Type 2 routescarry MAC + Host IP, NOT full subnets.
#C. These routes carry the L2VNI.
Incorrect:L2VNI is forLayer 2 VXLAN bridging, but these areIP Prefix Routes (L3 routing).
#D. These routes carry the L3VNI.
Correct:Type 5 routes are used forVXLAN L3 routing, which means they belong toL3VNI.
Real-World Application:
VXLAN L3 Gateways:Type 5 routes enabledistributed routing between VXLAN segments.
Data Center Networks:Used tointerconnect virtual machines (VMs) across different subnets.
#Reference:Huawei HCIE-Datacom Guide - BGP EVPN & VXLAN L3 Routing