The forwarding plane of a switch consists of data forwarding hardware, such as line cards or forwarding engines, and is responsible for tasks like encapsulating/decapsulating packets, providing high-speed data channels, and collecting packet statistics. However, main control boards are part of the control plane, not the forwarding plane. This distinction ensures a separation of data forwarding and control functionalities .

In dual-link MSB networking with load balancing, the new AP will connect to the AC with the lower number of connected APs. In this case, AC2 has only 20 connected APs, while AC1 has 100. Therefore, the new AP will connect to AC2 .

* Mandatory BGP Attributes
* Next_Hop: Specifies the next hop to reach the destination.
* AS_Path: Lists the autonomous systems traversed, crucial for loop prevention and route selection.
* Optional Attributes
* MED (Multi-Exit Discriminator) and Local_Preference are optional attributes that aid in route preference but are not mandatory.
* HCIP-Datacom-Core Reference
* BGP attribute behavior and classifications are detailed in BGP path selection principles.

Comprehensive and Detailed Step-by-Step Explanation:
1. Port Priority in RSTP:
RSTP (Rapid Spanning Tree Protocol) elects root and designated ports based on port priority and port ID.
Port priority is a configurable value that helps determine which port becomes the root or designated port when multiple ports are eligible.
The port ID consists of the port priority and port number. When priorities are equal, the port number is used as a tiebreaker.
2. Default Port Priority on Huawei Switches:
On Huawei switches, the default port priority is128.
This value can be adjusted in increments of 16 using the command stp port priority.
3. Analysis of Options:
Option A: 1
Incorrect. This is not the default port priority value.
Option B: 128
Correct. This is the default port priority value on Huawei switches.
Option C: 4096
Incorrect. This is not a valid default port priority value.
Option D: 32768
Incorrect. This is the default bridge priority, not the port priority.
4. Summary:
The default port priority on Huawei switches is128.
Huawei HCIA-Datacom Study Guide, Chapter "RSTP Port Role Election."
IEEE 802.1D-2004: Rapid Spanning Tree Protocol (RSTP).

When routes are imported into BGP using the import-route command, the origin attribute is set to incomplete by default. This indicates that the route's origin is not known or is from an external source, as opposed to being explicitly learned through an IGP (IGP) or EGP (EGP) protocol .