H3C Technologies H3C S7500E Series Switches - Manual (Page 186)

12-5
To do… Use the command… Remarks
Create a track entry, associate it
with the interface management
module to monitor the Layer 3
protocol status of an interface, and
specify the delay time for the track
module to notify the application
modules when the track entry
status changes
track track-entry-number
interface interface-type
interface-number protocol { ipv4 |
ipv6 } [ delay { negative
negative-time | positive
positive-time } * ]
Configuring Collaboration Between the Track Module and the
Application Modules
Configuring Track-VRRP Collaboration
VRRP is an error-tolerant protocol. It adds a group of routers that can act as network gateways to a
VRRP group, which forms a virtual router. Routers in the VRRP group elect the master acting as the
gateway according to their priorities. A router with a higher priority is more likely to become a master.
The other routers function as the backups. When the master fails, to ensure that the hosts in the
network segment can communicate with the external networks uninterruptedly, the backups in the
VRRP group elect a new gateway to undertake the responsibility of the failed master
Through the Track-VRRP collaboration, you can:
z Change the priority of a router according to the status of the uplink. If there is a fault on the uplink
of the router, the VRRP group cannot be aware of the uplink failure. If the router is the master,
hosts in the LAN cannot access the external network. This problem can be solved with the
track-VRRP collaboration function. Use the detection modules to monitor the status of the uplink
of the router and establish the collaborations between the detection modules, track module and
VRRP. When the uplink fails, the detection modules notify the track module to change the status
of the monitored track entry to Negative, and the priority of the master thus decreases by a
specified value, allowing a higher priority router in the VRRP group to become the master to
maintain proper communication between the hosts in the LAN and the external network.
z Monitor the master on a backup. If there is a fault on the master, the backup working in the
switchover mode will switch to the master immediately to maintain normal communication.
Follow these steps to configure Track-VRRP collaboration:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Create a VRRP group and
configure its virtual IP address
vrrp vrid virtual-router-id
virtual-ip virtual-address
Required
No VRRP group is created by
default.