The data center aggregation layer that uses IPv4 and IPv6 address space must act as a redundant Layer 3 gateway The solution must support a minimum of 240 virtual groups for an interface The data center aggregation layer hosts network devices from different vendors Which FHRP solution meets these requirements?

The requirements specify a First Hop Redundancy Protocol (FHRP) that supports both IPv4 and IPv6, is multi-vendor, and can handle at least 240 virtual groups. Virtual Router Redundancy Protocol version 3 (VRRPv3), defined in RFC 5798, meets all these criteria. It is an IETF standard, ensuring multi-vendor interoperability. It provides support for both IPv4 and IPv6 address families. VRRPv3 supports up to 4095 Virtual Router Identifiers (VRIDs), which far exceeds the minimum requirement of 240 virtual groups.

A. HSRPv1 is a Cisco-proprietary protocol that only supports IPv4 and is limited to 256 groups (0-255), failing the IPv6 and multi-vendor requirements.
C. VRRPv1 is not a standard designation; the common version is VRRPv2 (RFC 3768), which only supports IPv4, failing the IPv6 requirement.
D. HSRPv2 is a Cisco-proprietary protocol. While it supports IPv4, IPv6, and 4096 groups, it does not meet the multi-vendor interoperability requirement.

1. Cisco Systems, "IP Routing: HSRP and VRRP Configuration Guide, Cisco IOS XE Gibraltar 16.12.x", Chapter: Configuring VRRP. This guide states, "VRRPv3 provides support for IPv4 and IPv6." It also confirms VRRP is an IETF standard.

2. IETF RFC 5798, "Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6", Section 1: Introduction. "This document specifies Version 3 of the Virtual Router Redundancy Protocol (VRRP) for IPv4 and IPv6."

3. Cisco Nexus 9000 Series NX-OS Unicast Routing Configuration Guide, Release 9.3(x), Chapter: Configuring VRRP. "VRRP is a standard from the IETF (RFC 5798)." and "VRRPv3 supports IPv4 and IPv6."