Explanation/Reference:
Explanation:
A dedicated router used as a source of IP SLA measurement is also called a shadow router. Implementing IP SLA with a shadow router has several advantages:
* Dedicated router would offset the resource load on production router from the implemented IP SLA Network Management operations
* Dedicated router would be a central device that can be independently managed without any impact on network traffic.
* Granting SNMP read-write access to the device might not be such a huge security risk compared to enabling SNMP read-write on a production router carrying customer traffic.
* Better estimation of Layer 2 switching performance can be obtained if the access port is placed on the same switch/linecard as the endpoint to be managed. This is because the IP SLA packets also have to traverse the same interface queuing at the access layer as the regular IP packets.
Reference: https://www.cisco.com/en/US/technologies/tk869/tk769/
technologies_white_paper0900aecd806bfb52.html