Introduction To The Port Tracking Function - Huawei Quidway S3900 Series Operation Manual

Operation Manual – VRRP
Quidway S3900 Series Ethernet Switches-Release 1510
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
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.
VI. 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.

1.1.3 Introduction to the Port Tracking Function

VRRP backup group port tracking function can track the link state of the physical port,
and decrease the priority of the switch when the physical port fails.
When the master's uplink physical port fails, the priority of the master switch is
decreased by a set value. This in turn triggers the new master to be determined in the
backup group.
1.1.4 Auto Detect Implementation in VRRP
Note:
Currently, auto detect implementation in VRRP is only supported on S3900-EI series
switches.
VRRP timers (that
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Chapter 1 VRRP Configuration
is, the adver-interval argument). The