VRRP Packets

NE20E-S2 V800R010C10SPC500 Feature Description - Network Reliability 01

This is NE20E-S2 V800R010C10SPC500 Feature Description - Network Reliability

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VRRP Packets

VRRP packets are used to advertise the priority and status of the master router to all backup routers in the same VRRP backup group as the master. A VRRP packet is a multicast packet that can be forwarded only within a single broadcast domain, such as a virtual local area network (VLAN) or a virtual switching instance (VSI).

VRRP versions include VRRPv2 and VRRPv3. VRRPv2 applies only to IPv4 networks, and VRRPv3 applies to both IPv4 and IPv6 networks. VRRP is classified as VRRP for IPv4 (VRRP4) or VRRP for IPv6 (VRRP6) by network type. VRRP4 supports both VRRPv2 and VRRPv3, and VRRP6 supports only VRRPv3.

For an IPv4 network, VRRP packets are encapsulated into IPv4 packets and sent to an IPv4 multicast address assigned to a VRRP4 backup group. In an IPv4 packet header:

The source address is the primary IPv4 address of the interface that sends the packet.
The destination address is 224.0.0.18.
The time to live (TTL) value is 255.
The protocol number is 112.

For an IPv6 network, VRRP packets are encapsulated into IPv6 packets and sent to an IPv6 multicast address assigned to a VRRP6 backup group. In an IPv6 packet header:

The source address is the link-local address of the interface that sends the packet.
The destination address is FF02::12.
The hop count is 255.
The protocol number is 112.

NOTE:

The

NE20E allows you to manually switch a VRRP version. VRRP packets refer to VRRPv2 packets, unless otherwise specified in this document.

VRRP Packet Structure

Figure 5-6 and Figure 5-7 show the VRRPv2 and VRRPv3 packet structures, respectively.

Figure 5-6 VRRPv2 packet structure

Table 5-1 describes the fields in a VRRPv2 packet.

Table 5-1 Fields in a VRRPv2 packet

Field	Description
Version	Version number of the VRRP protocol. The value is 2.
Type	Type of the VRRPv2 packet. The value is 1, indicating that the packet is an advertisement packet.
Virtual Rtr ID	Virtual router identifier.
Priority	Priority of the master router in a VRRP backup group.
Count IPv4 Addrs	Number of virtual IPv4 addresses configured for a VRRP backup group.
Auth Type	VRRPv2 packet authentication type. VRRPv2 defines the following authentication types: 0: Non Authentication, indicating that authentication is not performed. 1: Simple Text Password, indicating that simple authentication is performed. 2: IP Authentication Header, indicating that MD5 authentication is performed.
Adver Int	Interval at which VRRPv2 packets are sent, in seconds.
Checksum	16-bit checksum, used to check the data integrity of the VRRPv2 packet.
IPv4 Address	Virtual IPv4 address configured for a VRRP backup group.
Authentication Data	Authentication key in the VRRPv2 packet. This field applies only when simple or MD5 authentication is used. For other authentication types, this field is fixed to 0.

Figure 5-7 VRRPv3 packet structure

Table 5-2 describes the fields in a VRRPv3 packet.

Table 5-2 Fields in a VRRPv3 packet

Field	Description
Version	Version number of the VRRP protocol. The value is 3.
Type	Type of the VRRPv3 packet. The value is 1, indicating that the packet is an advertisement packet.
Virtual Rtr ID	Virtual router identifier.
Priority	Priority of the master router in a VRRP backup group.
Count IPvX Addrs	Number of virtual IPvX addresses configured for a VRRP backup group.
rsvd	Field reserved for the VRRPv3 packet. The value must be set to 0.
Adver Int	Interval at which VRRPv3 packets are sent, in centiseconds.
Checksum	16-bit checksum, used to check the data integrity of the VRRPv3 packet.
IPvX Address	Virtual IPvX address configured for a VRRP backup group.

As shown in Figure 5-6 and Figure 5-7, the main differences between VRRPv2 and VRRPv3 are as follows:

VRRPv2 supports authentication, whereas VRRPv3 does not.
VRRPv2 supports a second-level interval between sending VRRP Advertisement packets, whereas VRRPv3 supports a centisecond-level interval.

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Updated: 2019-01-02

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VRRP Packet Structure

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