Auto Detect Implementation In Vlan Interface Backup; Configuring The Auto Detect Function For Vlan Interface Backup; Configuration Example - 3Com 5500-SI Configuration Manual

536 C 25: A D
HAPTER UTO
Auto Detect
Implementation in
VLAN Interface
Backup
Configuring the Auto
Detect Function for
VLAN Interface Backup

Configuration Example

C
ETECT ONFIGURATION
c Set the backup group preference value of Switch D to 100.
[S5500 D-vlan-interface1] vrrp vrid 1 priority 100
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.
You need to create a detecting group and perform configurations concerning VLAN
interfaces before the following operations.
Table 594 Configure the auto detect function for VLAN interface backup
Operation
Enter system view
Enter VLAN interface view
Enable the auto detect
function to implement
VLAN interface backup
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.
Command
system-view
interface vlan-interface
vlan_id
standby detect-group
group-number
Description
-
-
Required
This operation is only needed on
the secondary VLAN interface.