InGateway Documentation, Release 0.0.1
• Advertisement Interval: specifies the interval for heartbeat packet exchange between routers in the
VRRP group.
• Preemption Mode: enables the router to send VRRP Advertisement packets immediately when it finds
its priority higher than the current gateway. As a result, a new round of gateway election is triggered,
and the router replaces the previous gateway. Correspondingly, the previous gateway becomes a backup
router.
• Track ID: specifies the index or ID of an existing tracked object.
4.2.4 Interface Backup
Interface backup refers to master-backup bindings between interfaces on the same device. When the main
interface in a binding cannot transmit service traffic properly due to an interface failure or sufficient band-
width, traffic can be quickly switched to the backup interface. The backup interface then transmits all traffic
or shares a part of traffic. This feature improves the reliability of data communication between devices.The
interface backup parameters are described as follows:
• Main Interface: specifies the interface currently used for traffic forwarding.
• Backup Interface: specifies the interface waiting for traffic switching.
• Startup Delay: specifies the amount of time before an interface probe is triggered. The valid value
range is 0-300.
• Up Delay: specifies the amount of time before the main interface turns Up when the probe state
changes from failed to successful. The value 0 indicates that the main interface turns Up immediately.
The valid value range is 0-180.
• Down Delay: specifies the amount of time before the main interface turns Down when the probe
state changes from successful to failed. The value 0 indicates that the main interface turns Down
immediately. The valid value range is 0-180.
• Track id: specifies the index or ID of an existing tracked object. (If interface backup is used with the
track module, the main interface does not turn Down when a probe fails.)
4.3 Routing
Routing is a process that determines the end-to-end route of packets sent from a source to a destination.
Routing works on data packet forwarding devices on Layer 3 of the OSI reference model. A router connects
networks by forwarding data packets between them. When the router receives a data packet, it determines
the outbound interface and next-hop IP address by searching for the destination IP address of the data
packet in its routing table, and then rewrites the link-layer header of the data packet for forwarding. The
router dynamically maintains a routing table to record the current network topology and updates routing
information based on link information received from other routers on the network.
1.2. InGateway902 User Manual
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