Principles Of Vrrp - 3Com MSR 50 Series Configuration Manual

1976 C 107: VRRP C
HAPTER

Principles of VRRP

ONFIGURATION
IPv6-based VRRP packet format
Figure 586 IPv6-based VRRP packet format
0 3
Version Type
Auth Type
As shown in Figure
fields:
Version: Version number of the protocol, 3 for VRRPv3.
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Type: Type of the VRRP packet. Only one VRRP packet type is present, that is,
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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.
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
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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.
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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
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simple authentication and is 0 for any other authentication modes.
With VRRP enabled, the routers determine their respective roles in the standby
■
group by priority. The router with the highest priority becomes the master,
7 15
Virtual Rtr ID
Adver Int
IPv6 address 1
IPv6 address n
Authentication data 1
Authentication data 2
586, an IPv6-based VRRP packet consists of the following
23
Priority Count IPv6 Addrs
Checksum
31