512
Explanation:
Understanding VGMP (Virtual Gateway Management Protocol)
# What is VGMP?
* VGMP (Virtual Gateway Management Protocol) is used in Huawei firewalls to manage hot standby (HRP - Hot Standby Routing Protocol).
* Ensures that the active and standby firewalls synchronize their states for high availability.
# How Does VGMP Work?
* The Active and Standby firewalls exchange VGMP packets to maintain state synchronization.
* These packets are encapsulated within UDP for transport.
* The default UDP port for VGMP is 512.
Why is the Answer 512?
# Huawei firewalls use UDP port 512 by default for VGMP communication.# This ensures that VGMP heartbeats and synchronization messages are correctly processed.
Real-World Application:
* Enterprise Firewalls: VGMP ensures failover between active and standby firewalls.
* Carrier-Grade Firewalls: Uses VGMP with HRP to achieve zero-downtime firewall redundancy.
# Reference: Huawei HCIE-Datacom Guide - VGMP and HRP High Availability Mechanisms