3Com Switch 8800 Advanced Software V5 Configuration Guide

Introduction to VRRP 765
IPv6-based VRRP packet format
Figure 232 IPv6-based VRRP packet format
As shown in Figure 232, an IPv6-based VRRP packet consists of the following
fields:
■ Version: Version number of the protocol, 3 for VRRPv3.
■ Type: Type of the VRRP packet. Only one VRRP packet type is present, that is,
VRRP advertisement, which is represented by 1.
■ Virtual Rtr ID (VRID): Number of the virtual router, that is, number of the
standby group. It ranges from 1 to 255.
■ Priority: Priority of the router in the standby group, in the range 0 to 255. A
greater value represents a higher priority. The priority of 0 is reserved for special
purposes, while 255 is reserved for the IP address owner.
■ Count IPv6 Addrs: Number of virtual IPv6 addresses for the standby group. A
standby group can have multiple virtual IPv6 addresses.
■ Auth Type: Authentication type. 0 means no authentication, 1 means simple
authentication. VRRPv3 does not support MD5 authentication.
■ Adver Int: Interval for sending advertisement packets, in centiseconds. The
default is 100.
■ Checksum: 16-bit checksum for validating the data in VRRPv3 packets.
■ IPv6 Address: Virtual IPv6 address entry of the standby group. The allowed
number is given by the Count IPv6 Addrs field.
■ Authentication Data: Authentication key. Currently, this field is used only for
simple authentication and is 0 for any other authentication modes.
...
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