1078 CHAPTER 87: VRRP CONFIGURATION
IPv6-based VRRP packet format
Figure 321 IPv6-based VRRP packet format
As shown in Figure 321, 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 switch in the standby group, in the range 0 to 255. A
greater value represents a higher priority.
■ 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.
Principles of VRRP ■ With VRRP enabled, the switches determine their respective roles in the
standby group by priority. The switch with the highest priority becomes the
...
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
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