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InGateway Documentation, Release 0.0.1
4.2.2 Track Module
The track module implements the association function together with application modules and monitoring
modules. Located between application and monitoring modules, the track module shields the difference in
monitoring modules and provides the same interface for application modules.Parameters of the track module
are described as follows:
• Index: specifies the index or ID of a tracked object, which can be manually set or automatically
generated. You can add a maximum of 10 tracked objects.
• Type: specifies the type of the tracked object. Options are sla and interface.
• SLA ID: specifies the index or ID of an existing SLA entry. This parameter is unavailable when the
track type is set to interface.
• Interface: specifies the tracked interface. This parameter is unavailable when the track type is set to
sla.
• Negative Delay: specifies the amount of time before the tracked object is displayed as abnormal after
the interface or SLA state changes to DOWN. The value 0 indicates that the abnormal state is displayed
immediately. The unit of the value is second.
• Positive Delay: specifies the amount of time before the tracked object switches to the normal state after
fault recovery. The value 0 indicates that the tracked object switches to the normal state immediately.
4.2.3 VRRP
The Virtual Router Redundancy Protocol (VRRP) enables multiple routers on a LAN to function as one
virtual router. A router can be virtualized into multiple virtual routers based on IP addresses of VLAN
interfaces on different network segments. Each virtual router is identified by an ID. A router can be virtual-
ized into up to 255 virtual routers.The interface tracking capability of VRRP extends the backup function,
providing backup for not only interfaces on other routers but also other interfaces on the local router (such as
an upstream interface) when these interfaces are faulty. When an upstream interface is in Down or Removed
state, the local router lowers its own priority to enable another router with a higher priority in the VRRP
group to become the gateway for traffic forwarding.The VRRP parameters are described as follows:
• Enable: enables or disables VRRP.
• Virtual Router ID: specifies the ID of a virtual router. The valid value range is 1-255.
• Interface: specifies the interface on which the virtual router is configured.
• Virtual IP: specifies the IP address of the virtual router.
• Priority: specifies the priority of the local router in the VRRP group. The value ranges from 0 to 255
(a larger value indicates a higher priority). A router with a higher priority is more likely to become
the gateway.
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