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Configuring the Advertisement Interval for the VRRP Master Router

By default, the master router sends VRRP advertisement packets every second to all members of the VRRP group. These packets indicate that the master router is still operational. If the master router fails or becomes unreachable, the backup router with the highest priority value becomes the new master router.

You can modify the advertisement interval in seconds or in milliseconds; the interval must be the same for all routing platforms in the VRRP group.

For VRRP for IPv6, you must configure IPv6 router advertisements for the interface on which VRRP is configured to send IPv6 router advertisements for the VRRP group. To do so, include the interface interface-name statement at the [edit protocols router-advertisement] hierarchy level. (For information on this statement and guidelines, see the JUNOS Routing Protocols Configuration Guide.) When an interface receives an IPv6 Router Solicitation message, it sends IPv6 Router Advertisement to all VRRP groups configured on it. In the case of logical systems, IPv6 router advertisements are not sent to VRRP groups.

Note: The master VRRP for IPv6 router must respond to a Router Solicitation message with the virtual IP address of the router. However, when the interface interface-name statement is included at the [edit protocols router-advertisement] hierarchy level, the backup VRRP for IPv6 router might send a response before the VRRP master responds so that the default route of the client is not set to the master VRRP router's virtual IP address. To avoid this situation, include the virtual-router-only statement at the [edit protocols router-advertisement] interface interface-name hierarchy level. When this statement is included, router advertisements are sent only for VRRP IPv6 groups configured on the interface (if the groups are in the master state). You must include this statement on both the master and backup VRRP for IPv6 routers.

This topic contains the following sections:

Modifying the Advertisement Interval in Seconds

To modify the time, in seconds, between the sending of VRRP advertisement packets, include the advertise-interval statement:

advertise-interval seconds;

The interval can be from 1 through 255 seconds.

You can include this statement at the following hierarchy levels:

Modifying the Advertisement Interval in Milliseconds

To modify the time, in milliseconds, between the sending of VRRP advertisement packets, include the fast-interval statement:

fast-interval milliseconds;

The interval can be from 100 through 999 milliseconds.

You can include this statement at the following hierarchy levels:

Note: In the VRRP PDU, the JUNOS software sets the advertisement interval to 0. When you configure VRRP with other vendors’ routers, the fast-interval statement works correctly only when the other routers also have an advertisement interval set to 0 in the VRRP PDUs. Otherwise, the JUNOS software interprets other routers’ settings as advertisement timer errors.

To modify the time, in milliseconds, between the sending of VRRP for IPv6 advertisement packets, include the inet6-advertise-interval statement:

inet6-advertise-interval ms;

The range of values is from 100 through 40,950 milliseconds (ms).

You can include this statement at the following hierarchy levels:

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