VRRPv2 Characteristics: Defaults, Auth, and Address Family
Short answer
BCD VRRPv2 defaults to a 1-second advertisement interval, supports authentication fields, and uses a default priority of 100, whereas it does not support IPv6.
Question
Key Takeaways
The main trap is confusing VRRPv2 with VRRPv3; remember that IPv6 support and stronger security features are exclusive to VRRPv3, while VRRPv2 is IPv4-only.
This question tests knowledge of VRRPv2 specific parameters. Correct options are B, C, and D, highlighting that VRRPv2 uses 1s advertisements, supports auth, and has a default priority of 100, but lacks IPv6 support.
Common mistake: Candidates often select A because they know VRRP exists for IPv6, but fail to recall that this capability was added in VRRPv3, not VRRPv2.
Expert Analysis
VRRPv2 Protocol Specifications and Behavior
VRRP (Virtual Router Redundancy Protocol) is designed to provide default gateway redundancy for IP hosts. It is crucial to distinguish between the capabilities of VRRP version 2 (defined in RFC 3768) and version 3 (defined in RFC 5798), as they differ significantly in address family support, authentication, and packet formats.
Option B: Advertisement Interval By default, VRRP routers send advertisement packets every 1 second. This high frequency ensures rapid detection of master router failures. While this interval can be configured, the default behavior is a key characteristic of both VRRPv2 and VRRPv3. Therefore, this statement is true.
Option C: Authentication Support VRRPv2 includes a simple text-based or MD5 authentication field within its packet header. Although modern best practices often discourage weak authentication or rely on IPsec (which VRRPv3 supports more natively via AH), VRRPv2 does technically support an authentication mechanism defined in the protocol spec. Thus, stating it supports authentication is factually correct in the context of protocol features available in v2.
Option D: Default Priority The default priority value for a VRRP router is 100. A higher priority increases the likelihood of becoming the Master router. The range is 1-254 (with 255 reserved for the virtual router owner if it owns the IP). This default setting applies to VRRPv2.
Why Option A is Incorrect VRRPv2 is explicitly designed for IPv4 only. It uses IPv4 protocol number 112. Support for IPv6 was introduced later with VRRPv3, which uses ICMPv6. Therefore, claiming VRRPv2 works with IPv6 is false.
The comments correctly identify B, C, and D as the true statements regarding VRRPv2's technical specifications.
Official Reference
https://www.rfc-editor.org/rfc/rfc3768
This link opens the official vendor documentation in a new tab.
Exam Strategy
When studying redundancy protocols like VRRP, create a comparison table between versions. Specifically note which features were added or removed in newer versions (e.g., IPv6 in VRRPv3). Memorize the default values (priority 100, interval 1s) as they are frequent exam targets.
Frequently Asked Questions
Does VRRPv2 support IPv6?
What is the default priority in VRRP?
Discussion 1 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 1
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HCIP Resolutor 👍 1En las especificaciones de RFC y la documentación oficial de Huawei VRP, las opciones B, C y D son afirmaciones VERDADERAS y técnicamente correctas respecto a VRRPv2.
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