How is this issue resolved?

Refer to the exhibit.

An engineer is monitoring reachability of the configured default routes to ISP1 and ISP2. The default route from ISP1 is preferred if available.

How is this issue resolved?
A . Use the icmp-echo command to track both default routes
B. Use the same AD for both default routes
C. Start IP SLA by matching numbers for track and ip sla commands
D. Start IP SLA by defining frequency and scheduling it

View Answer

Answer: D

Explanation:

Reference: https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/200785-ISP-Failover-with-default-routes-using-I.html

In the above configuration we have not had activated our IP SLA operation.

We can start it with this command:

R1(config)#ip sla schedule 100 life forever start-time now

Also we should specific the rate of ICMP echo:

R1(config-ip-sla-echo)#frequency 5 // Send ICMP echo every 5 seconds