IS-IS Multi-Process:
Huawei devices support runningmultiple IS-IS processes simultaneously.
These processes arecompletely independentof one another: different LSDBs, interfaces, routing tables, etc.
Each process can be associated with aseparate VPN instance, and asingle VPN instance can be served by multiple IS-IS processes.
IS-IS Multi-Instance:
One IS-IS process canrun multiple instances, typically used formulti-VPN scenarios.
However, Huawei's current implementation prefersone VPN per processfor clarity and control.
Based on Huawei’s design:
Ais incorrect — an IS-IS processcanserve multiple VPNs in other vendors, but Huawei typically uses one process per VPN for clean separation.
Bis correct — a VPN instance can be associated withmultiple IS-IS processes.
Cis incorrect in Huawei implementation context.
Dis correct —IS-IS processes are independent.
Correct answers: B, D
[Reference:Huawei HCIE-Datacom V1.0 Study Guide —Chapter: IS-IS Advanced FeaturesSection: Multi-process and VPN Association, , , ]