HP VPN Firewall Appliances High Availability Configuration Guide

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Figure 3 VRRPv2 packet format
Figure 4 VRRPv3 packet format
A VRRP packet comprises the following fields:
• Version—Version number of the protocol, 2 for VRRPv2 and 3 for VRRPv3.
• Type—Type of the VRRPv2 or VRRPv3 packet. It must be VRRP advertisement, represented by 1.
• Virtual Rtr ID (VRID)—ID of the virtual router. It ranges from 1 to 255.
• Priority—Priority of the router in the VRRP group, in the range 0 to 255. A greater value represents
a higher priority.
• Count IP Addrs/Count IPv6 Addrs—Number of virtual IPv4 or IPv6 addresses for the VRRP group.
A VRRP group can have multiple virtual IPv4 or IPv6 addresses.
• Auth Type—Authentication type. 0 means no authentication, 1 means simple text authentication,
and 2 means MD5 authentication. VRRPv3 does not support MD5 authentication.
• Adver Int—Interval for sending advertisement packets. For VRRPv2, the interval is in seconds and
defaults to 1. For VRRPv3, the interval is in centiseconds and defaults to 100.
• Checksum—16-bit checksum for validating the data in VRRP packets.
...
Version Type Virtual Rtr ID Priority Count IPv6 Addrs
Auth Type Adver Int Checksum
IPv6 address 1
Authentication data 1
Authentication data 2
IPv6 address n
0 7 15 23 313