H3C Technologies H3C SecBlade LB Cards - Manual (Page 99)

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• When the physical or network-layer protocol status of the interface changes to up, the interface
management module informs the Track module of the change and the Track module sets the track
entry to Positive.
• When the physical or network-layer protocol status of the interface changes to down, the interface
management module informs the Track module of the change and the Track module sets the track
entry to Negative.
To associate Track with interface management:
Step Command Remarks
1. Enter system view. system-view N/A
2. Associating Track
with interface
management.
• 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 } * ]
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, the backups in the VRRP group elect a new
gateway to undertake the responsibility of the failed master. This ensures that the hosts in the network
segment can uninterruptedly communicate with external networks.
When VRRP is operating in standard protocol mode or load balancing mode, associate the Track
module with the VRRP group to implement the following actions:
• Change the priority of a router according to the status of the uplink. If a fault occurs 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 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 decreases by a specified value. This allows