195
To do…
Use the command…
Remarks
Create a track entry, associate it with
the interface management module to
monitor the physical status of an
interface, and specify the delay time
for the track module to notify the
associated application module when
the track entry status changes
track
track-entry-number
interface
interface-type interface-number
[
delay
{
negative
negative-time
|
positive
positive-time
} * ]
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
associated application module 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
} * ]
Required
Use either approach
No track entry is created
by default.
Associating the track module with an application
module
Associating track with VRRP
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 the master. The other
routers function as the backups. When the master fails, to ensure that the hosts in the network segment
can uninterruptedly communicate with external networks, the backups in the VRRP group elect a new
gateway to undertake the responsibility of the failed master.
When VRRP works in standard protocol mode or load balancing mode, associate the track module with
the VRRP group to implement the following objects:
•
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 by establishing a
track-VRRP group association. 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 then 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.
•
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.
When VRRP works in the load balancing mode, through the association between the track module and
VRRP Virtual Forwarder (VF), you can change the priority of a VF according to the status of the uplink.
When the uplink of the active VF (AVF) fails, the status of the track entry changes to Negative and the
weight of the VF decreases by a specified value so that the VF with a higher priority becomes the AVF
and forwards packets.
Follow these steps to associate track with VRRP group: