Static Route Object Tracking feature tracks the state of an object's reachability using IP SLA. Client processes like Virtual Router Redundancy Protocol (VRRP) or RIB can register their interest in tracking objects and receive notifications when a state change occurs.

IP Service-Level Assurance (SLA) is a protocol used for analyzing IP service levels in applications and services. It employs active traffic-monitoring technology to continuously monitor network traffic. IP SLA utilizes Internet Control Message Protocol (ICMP) pings to detect link failures and notifies registered clients of such events.

Each tracked object is assigned a unique number in the tracking command, which client processes use to monitor specific objects. The tracking process monitors events from these tracked objects and records value changes. Any changes in tracked object values are communicated to interested client processes, either immediately or with a specified delay. The object values are reported as either up or down.

Figure 2-3 represents a sample network topology featuring RTR1, RTR2, RTR3, and RTR4, used to demonstrate the static route object tracking feature.

The following configuration commands provide an illustrative example of setting up various network parameters on the routers (RTR1, RTR2, RTR3, and RTR4). These commands showcase the configuration of IPv4 addresses, the implementation of IP SLA for network monitoring, the establishment of static routes, and the use of time ranges. Each command serves a specific purpose in configuring and fine-tuning the router's behavior within the network. This example demonstrates a basic network setup with key components for efficient network management and monitoring.

Below is the routing and tracking information for RTR1, which includes details about its IP SLA reachability tracking and static routes.

Now remove the IPv4 address configuration from interface ce52 on RTR2 and commit the changes made in the configuration to the running configuration.

The following output from RTR1 routing table and tracking details indicates changes in the reachability of certain routes and related IP SLA measurements:

The IP SLA measurement for SLA 1 experienced threshold exceedances and timeouts, resulting in changes to the reachability status of the tracked routes. The routes associated with IP SLA tracking, such as 3.3.3.0/24 and 6.6.6.0/24, are marked as DOWN.

When the IP SLA operation determines that 6.6.6.6 is reachable, the route appears in the routing table, allowing traffic to be routed to that destination. This mechanism provides dynamic routing based on the real-time reachability of the specified IPv4 address.

Now configure the IPv4 address from interface ce52 on RTR2 and commit the changes made in the configuration to the running configuration.

By configuring the IPv4 address on RTR2 interface ce52 brings up the interface and allows RTR1 to reach RTR2 via the IPv4 address 2.2.2.2/24, leading to the change in the IP SLA tracking state and the associated static route states to UP.

The following configuration commands provide an illustrative example of setting up various network parameters on the routers (RTR1, RTR2, RTR3, and RTR4). These commands showcase the configuration of IPv6 addresses, the implementation of IP SLA for network monitoring, the establishment of static routes, and the use of time ranges. Each command serves a specific purpose in configuring and fine-tuning the router's behavior within the network. This example demonstrates a basic network setup with key components for efficient network management and monitoring.

Below is the routing and tracking information for RTR1, which includes details about its IP SLA reachability tracking and static routes.