3Com S7906E - Switch, Руководство по настройке

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1-5
Packet Format
The master multicasts VRRP packets periodically to declare its existence. VRRP packets are also used
for checking the parameters of the virtual router and electing the master.
Figure 1-3 shows the format of a VRRPv2 packet and Figure 1-4 shows the format of a VRRPv3 packet.
Figure 1-3 Format of a VRRPv2 packet
...
Figure 1-4 Format of a VRRPv3 packet
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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 31 3
A VRRP packet consists of the following fields:
z
Version: Version number of the protocol, 2 for VRRPv2 and 3 for VRRPv3.
z
Type: Type of the VRRPv2 or VRRPv3 packet. Only one VRRP packet type is present, that is,
VRRP advertisement, which is represented by 1.
z
Virtual Rtr ID (VRID): Serial number of the virtual router, that is, serial number of the VRRP group.
It ranges from 1 to 255.
z
Priority: Priority of the router in the VRRP group, in the range 0 to 255. A greater value represents
a higher priority.
z
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.