RFC 9568, "Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6", April 2024

Errata ID: 8299
Status: Verified
Type: Technical
Publication Format(s) : TEXT, PDF, HTML
Reported By: Quentin Armitage
Date Reported: 2025-02-17
Verifier Name: Jim Guichard
Date Verified: 2025-03-06

Section 7.1 says:

 * It MUST verify that the VRID is configured on the receiving
   interface and the local router is not the IPvX address owner
   (Priority = 255 (decimal)).

If any one of the above checks fails, the receiver MUST discard the
packet, SHOULD log the event (subject to rate-limiting), and MAY
indicate via network management that an error occurred.

It should say:

 * It MUST verify that the VRID is configured on the receiving
   interface and the local router is not the IPvX address owner
   (Priority = 255 (decimal)).

 * It MUST verify that IPvX Addr Count is non zero.

If any one of the above checks fails, the receiver MUST discard the
packet, SHOULD log the event (subject to rate-limiting), and MAY
indicate via network management that an error occurred.

Notes:

The only change above is adding:
* It MUST verify that IPvX Addr Count is non zero.

This is due to section 5.2.5 requiring it:

5.2.5. IPvX Addr Count

The IPvX Addr Count field is the number of either IPv4 addresses or IPv6 addresses contained in this VRRP advertisement. The minimum value is 1. If the received count is 0, the VRRP advertisement MUST be ignored.

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