Auto Detect Implementation In Vlan Interface Backup - Huawei Quidway S3900 Series Operation Manual

Operation Manual – Auto Detect
Quidway S3900 Series Ethernet Switches-Release 1510
# Specify to detect the reachability of the IP address 10.1.1.4/24, setting the detect
number to 1.
[Quidway B-detect-group-9] detect-list 1 ip address 10.1.1.4
[Quidway B-detect-group-9] quit
# Assign an IP address to VLAN 1 interface.
[Quidway B] interface vlan-interface 1
[Quidway B-Vlan-interface1] ip address 192.168.1.2 24
# Enable VRRP on VLAN 1 interface and assign a virtual IP address to the backup
group.
[Quidway B-Vlan-interface1] vrrp vrid 1 virtual-ip 192.168.1.10
# Set the backup group priority of switch B to 110, and specify to decrease the priority
by 20 when the result of detecting group 9 is unreachable.
[Quidway B-Vlan-interface1] vrrp vrid 1 priority 110
[Quidway B-Vlan-interface1] vrrp vrid 1 track detect-group 9 reduced 20
Configure Switch D.
# Assign an IP address to VLAN 1 interface.
<Quidway D> system-view
[Quidway D] interface vlan-interface 1
[Quidway D-Vlan-interface1] ip address 192.168.1.3 24
# Enable VRRP on VLAN 1 interface and assign a virtual IP address to the backup
group.
[Quidway D-Vlan-interface1] vrrp vrid 1 virtual-ip 192.168.1.10
# Set the backup group priority of Switch D to 100.
[Quidway D-Vlan-interface1] vrrp vrid 1 priority 100

2.4 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, when 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.
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Chapter 2 Auto Detect Implementation