Configuring The Fast Switch Function For A Virtual Router; Chapter 1 Vrrp Configuration - H3C S9500 Series Operation Manual

Operation Manual – VRRP
H3C S9500 Series Routing Switches
Figure 1-3 Network diagram for IFM devices
As shown in
enabled to track the status of the corresponding IFM device through the OAM module.
When receiving signals from the IFM device, the priority of the corresponding interface
on a switch will increase by the value specified by value-increased. The switch with a
higher priority becomes the master. When the link of the master is down, the priority will
decrease by a specified value. As a result, the backup will have a higher priority and
become the master switch. Thus, the cooperation between IFM and VRRP through
OAM is implemented.
Perform the following configuration in VLAN interface view to enable/disable IFM
tracking:
Enable IFM tracking
Disable IFM tracking
By default, the value of the value-increased argument is 2.

1.2.12 Configuring the Fast Switch Function for a Virtual Router

In VRRP, a backup device can switch to the master state after the specified timer
expires. This mechanism causes delay in state switching and is not applicable to
network environments that require fast state switching because it may interrupt traffic
temporarily. To solve this problem, S9500 series switches support the fast switch
function for the virtual router.
If the uplink virtual interface tracked by the master goes down, the master device
immediately decreases its priority and sends an advertisement packet.
Upon receiving the advertisement packet, the backup device compares the priority
in the packet with that of its own. If the backup device has a higher priority, it
switches to the master state immediately.
Figure 1-3, the two Layer 3 switches form a VRRP group. Each switch is
To do... Use the command...
vrrp vrid virtual-router-id track ifm [ increased
value-increased ]
undo vrrp vrid virtual-router-id track ifm
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Chapter 1 VRRP Configuration