15.1.7 Supported VRRP Standards
The Switch supports multiple VRRP specifications. Therefore, you can configure virtual routers as desired according to the specification used in an existing system. To select a VRRP specification for the virtual routers, specify a VRRP operation mode.
The following table describes the supported VRRP specifications and the commands for specifying the VRRP operation mode.
|
Standards |
Command for specifying the VRRP operation mode |
|
|---|---|---|
|
IPv4 |
RFC 3768 |
The mode is set by IPv4 virtual routers by default. |
|
IPv6 |
draft-ietf-vrrp-ipv6-spec-02 |
The mode is set by IPv6 virtual routers by default. |
|
draft-ietf-vrrp-ipv6-spec-07 |
vrrp ietf-ipv6-spec-07-mode |
|
The format of an advertisement packet and the meaning of the fields differ according to the specification. If a switch that participates in a virtual router uses a different specification, the switch might regard an advertisement packet sent from another switch as an invalid packet and discard it. In this case, multiple switches might become the master router. To prevent this problem, configure the same VRRP operation mode on all the switches that participate in a virtual router.
- <Structure of this section>
(1) Summary of Default Operation for IPv4 Virtual Router
IPv4 virtual routers use VRRP packets of VRRP protocol version 2 (specified in RFC 3768) to send and receive advertisements. The IPv4 virtual routers can authenticate advertisement packets.
Determine the failure detection time based on the sending interval of advertisement packets configured for the Switch. The sending interval of advertisement packets is set in one-second units.
(2) Summary of Default Operation for IPv6 Virtual Router
IPv6 virtual routers use VRRP packets of VRRP protocol version 3 (specified in draft-ietf-vrrp-ipv6-spec-02) to send and receive advertisements. The IPv6 virtual routers can authenticate advertisement packets.
Determine the failure detection time based on the sending interval of advertisement packets configured for the Switch. The sending interval of advertisement packets is set in one-second units.
(3) Vrrp ietf-ipv6-spec-07-mode Operation outline
Another VRRP operation mode supported by IPv6 virtual routers is vrrp-ietf-ipv6-spec-07-mode.
The IPv6 virtual routers in this mode use VRRP packets of VRRP protocol version 3 (specified in draft-ietf-vrrp-ipv6-spec-07) to send and receive advertisements.
Determine the failure detection time based on the sending interval of advertisement packets configured for the Switch. The sending interval of advertisement packets is set in one-second units.
In this mode, the IPv6 virtual routers cannot authenticate advertisement packets.