Huawei Updated H12-821_V1.0 Exam Questions and Answers by rachel

The mandatory parameters for BGP peer configuration are the peer IP address ( peer ip-address ) and AS number ( as-number ). A password is optional for MD5 authentication, and a description is an optional comment for reference. These are not required for establishing the peer relationship ​.

The election of a Designated Router (DR) and Backup Designated Router (BDR) occurs during the OSPF network ' s initial setup or upon the failure of an existing DR. A new router joining an OSPF network does not automatically preempt the current DR, even if it has the highest priority. DR and BDR elections are not preemptive. The other statements are correct regarding OSPF DR/BDR election processes ​.

When the router ID is configured in both the system view and the BGP view, the router ID in the BGP view takes precedence because BGP-specific configurations override global settings. This ensures that BGP operates with the most relevant configurations ​.

Internet – This community attribute allows a route to be advertised to any BGP peer , including EBGP and IBGP. This is the default behavior if no other restrictive community is attached.

No_Advertise – Prevents the route from being advertised to any peer.

No_Export – Prevents the route from being advertised to EBGP peers .

No_Export_Subconfed – Restricts the route from being advertised outside the sub-AS in a confederation.

Reference from Huawei HCIP-Datacom-Core Technology Study Guide:

“The Internet community attribute allows unrestricted advertisement of a route. Other community attributes like No_Advertise and No_Export limit route propagation.”

(Chapter: BGP Community Attributes – Section: Well-known Communities)