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VRRP Configuration 155
Configuring VRRP timer
The master switch advertises its normal operation state to the switches within the
VRRP backup group by sending VRRP packets once in each specified interval
(determined by the adver-interval argument). If the backup switches do not receive
VRRP packets from the master after a specific period (determined by the
master-down-interval argument), they consider the master is down and initiates the
process to determine the master switch.
You can adjust the frequency in which a master sends VRRP packets by setting the
corresponding VRRP timers (that is, the adver-interval argument). The
master-down-interval argument is usually three times of the adver-interval argument.
Excessive network traffic or differences between the timers of different switches will
result in master-down-interval timing out and state changing abnormally. Such
problems can be solved through prolonging the adver-interval and setting delay time.
If you configure the preemption delay for a backup switch, the switch preempts the
master after the period specified by the preemption delay if it does not receive a VRRP
packet from the master for the period specified by the master-down-interval
argument.
Configuring the VLAN interfaces to be tracked for a backup group
The VLAN interface tracking function expands the backup group function. With this
function enabled, the backup group function is provided not only when the interface
where the backup group resides fails, but also when other interfaces are unavailable.
By executing the related command you can track an interface.
When a tracked VLAN interface goes down, the priority of the switch owning the
interface will reduce automatically by a specified value (the value-reduced argument).
If the switches with their priorities higher than that of the current master switch exist
in the backup group, a new master switch will be then determined.
VRRP Configuration The following sections describe the VRRP configuration tasks:
■ Configuring a Virtual Router IP address
■ Configuring Backup Group-Related Parameters
Configuring a Virtual
Router IP address
Table 137 lists the operations to configure a virtual router IP address (suppose you
have correctly configured the relation between the port and VLAN):
Table 137 Configure a virtual router IP address
Operation Command Description
Enter system view system-view -
Configure that the
virtual IP address can
be pinged
Vrrp ping-enable Optional
By default, the virtual IP address
cannot be pinged.
Map the virtual router
IP address to a MAC
address
Vrrp method { real-mac |
virtual-mac }
Optional
By default, the virtual IP address of a
backup group is mapped to a virtual
router IP address.
Create a VLAN vlan vlan-id -
Quit to system view quit -
Enter VLAN interface
view
interface vlan-interface vlan-id -