HP 6125G HP 6125G & 6125G/XG Blade Switches High Availability Configur - Page 122

Packet format,

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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. VRRP packets are encapsulated in IP packets, with the protocol number being 112. Figure 29 shows the format of a VRRPv2 packet and Figure 30 shows the format of a VRRPv3 packet. Figure 29 Format of a VRRPv2 packet Figure 30 Format of a VRRPv3 packet 0 3 Version 7 Type 15 Virtual Rtr ID Auth Type Adver Int Priority 23 31 Count IPv6 Addrs Checksum IPv6 address 1 ... IPv6 address n Authentication data 1 Authentication data 2 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. Only one VRRP packet type is present, that is, VRRP advertisement, which is represented by 1. • Virtual Rtr ID (VRID)-ID of the virtual router, that is, ID of the VRRP group. It ranges from 1 to 255. • Priority-Priority of the router in the VRRP group, in the range of 0 to 255. A greater value represents a higher priority. 115

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115
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.
VRRP packets are encapsulated in IP packets, with the protocol number being 112.
Figure 29
shows the
format of a VRRPv2 packet and
Figure 30
shows the format of a VRRPv3 packet.
Figure 29
Format of a VRRPv2 packet
Figure 30
Format of a VRRPv3 packet
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. Only one VRRP packet type is present, that is, VRRP
advertisement, which is represented by 1.
•
Virtual Rtr ID (VRID)
—ID of the virtual router, that is, ID of the VRRP group. It ranges from 1 to 255.
•
Priority
—Priority of the router in the VRRP group, in the range of 0 to 255. A greater value
represents a higher priority.
...
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