536 CHAPTER 25: AUTO DETECT CONFIGURATION
cSet the backup group preference value of Switch D to 100.
[S5500 D-vlan-interface1] vrrp vrid 1 priority 100
Auto Detect Implementation in VLAN Interface Backup
The interface backup function is used to back up VLAN interfaces by using the auto
detect function. For two VLAN interfaces configured with the same destination
device, you can configure them to be the primary interface and the secondary
interface. The latter is enabled automatically when the primary fails, so as to ensure
the connectivity. In this case, the auto detect function is implemented as follows:
■In normal situations (that is, the result of the detecting group is reachable), the
secondary VLAN interface is down and packets are transmitted through the
primary VLAN interface.
■When the link between the primary VLAN interface and the destination operates
improperly (that is, the result of the detecting group is unreachable), the system
shuts down the primary VLAN interface and enables the secondary VLAN
interface.
■When the link between the primary VLAN interface and the destination comes
back up (that is, the result of the detecting group becomes reachable again), the
system enables the primary VLAN interface and shuts down the secondary.
Configuring the Auto
Detect Function for
VLAN Interface Backup
You need to create a detecting group and perform configurations concerning VLAN
interfaces before the following operations.
Configuration Example Network requirements
■Configure a static route between Switch B and Switch C.
■Create detecting group 10 on Switch A, which is used to detect the connectivity
between Switch B and Switch C.
■Configure VLAN 1 interface to be the primary interface, which operates when the
result of detecting group 10 is reachable.
■Configure VLAN 2 interface to be the secondary interface, which operates when
the result of the detecting group is unreachable.
■Make sure the dynamic routes between Switch A, Switch B, and Switch C are
reachable; and those between Switch A, Switch D, and Switch C are also
reachable.
Table594 Configure the auto detect function for VLAN interface backup
Operation Command Description
Enter system view system-view -
Enter VLAN interface view interface vlan-interface
vlan_id
-
Enable the auto detect
function to implement
VLAN interface backup
standby detect-group
group-number
Required
This operation is only needed on
the secondary VLAN interface.