Introduction to VRRP 1077
IPv4-based VRRP packet format
Figure 320 IPv4-based VRRP packet format
As shown in Figure 320, an IPv4-based VRRP packet consists of the following
fields:
■ Version: Version number of the protocol, 2 for VRRPv2.
■ 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 IP Addrs: Number of virtual IP addresses for the standby group. A
standby group can have multiple virtual IP addresses.
■ Auth Type: Authentication type. 0 means no authentication, 1 means simple
authentication, and 2 means MD5 authentication.
■ Adver Int: Interval for sending advertisement packets, in seconds. The default is
1.
■ Checksum: 16-bit checksum for validating the data in VRRP packets.
■ IP Address: Virtual IP address entry of the standby group. The allowed number
is given by the Count IP 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 IP Addrs
Auth Type Adver Int Checksum
IP address 1
IP address n
Authentication data 1
Authentication data 2
0 7 15 23 313
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