Chapter 34 VRRP

Table 106 VRRP Configuration: IP Interface

LABEL

DESCRIPTION

Index

This field displays the index number of an entry.

 

 

Network

This field displays the IP address and number of subnet mask bit of an IP domain.

 

 

Authentication

Select None to disable authentication. This is the default setting.

 

Select Simple to use a simple password to authenticate VRRP packet exchanges on

 

this interface.

 

 

Key

When you select Simple in the Authentication field, enter a password key (up to

 

eight printable ASCII character long) in this field.

 

 

Apply

Click Apply to save your changes to the Switch’s run-time memory. The Switch loses

 

these changes if it is turned off or loses power, so use the Save link on the top

 

navigation panel to save your changes to the non-volatile memory when you are done

 

configuring.

 

 

Cancel

Click Cancel to discard all changes made in this table.

 

 

34.3.2 VRRP Parameters

This section describes the VRRP parameters.

34.3.2.1 Advertisement Interval

The master router sends out Hello messages to let the other backup routers know that it is still up and running. The time interval between sending the Hello messages is the advertisement interval. By default, a Hello message is sent out every second.

If the backup routers do not receive a Hello message from the master router after this interval expires, it is assumed that the master router is down. Then the backup router with the highest priority becomes the master router.

"All routers participating in the virtual router must use the same advertisement interval.

34.3.2.2Priority

Configure the priority level (1 to 254) to set which backup router to take over in case the master router goes down. The backup router with the highest priority will take over. The priority of the VRRP router that owns the IP address(es) associated with the virtual router is 255.

34.3.2.3 Preempt Mode

If the master router is unavailable, a backup router assumes the role of the master router. However, when another backup router with a higher priority joins the network, it will preempt the lower priority backup router that is the master. Disable preempt mode to prevent this from happening.

By default, a layer 3 device with the same IP address as the virtual router will become the master router regardless of the preempt mode.

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GS-4012F/4024 User’s Guide