CCIE за год. Цикл 7. Тема 38. Вопросы.

1. Для чего используется IP SLA?

IP SLAs allows Cisco customers to analyze IP service levels for IP applications and services, to increase productivity, to lower operational costs, and to reduce the frequency of network outages. IP SLAs uses active traffic monitoring—the generation of traffic in a continuous, reliable, and predictable manner—for measuring network performance. Using IP SLAs, service provider customers can measure and provide service level agreements, and enterprise customers can verify service levels, verify outsourced service level agreements, and understand network performance. IP SLAs can perform network assessments, verify quality of service (QoS), ease the deployment of new services, and assist administrators with network troubleshooting. IP SLAs can be accessed using the Cisco software commands or Simple Network Management Protocol (SNMP) through the Cisco Round-Trip Time Monitor (RTTMON) and syslog Management Information Bases (MIBs).

2. Какой порт при настройке IP SLA не должен быть заблокирован?

IP SLA responder Control port — UDP 1967

3. Назовите параметры интервала и расписания выполнения IP SLA по-умолчанию

frequency — default is 60 seconds
ip sla monitor schedule
life — default is 3600 seconds (1 hour)
ageout — default is 0 seconds (never ages out)

4. Для чего используется Enhanced Object Tracking

This feature provides a more complete alternative to the Hot Standby Routing Protocol (HSRP) tracking mechanism. which allows you to track the line-protocol state of an interface. If the line protocol state of an interface goes down, the HSRP priority of the interface is reduced and another HSRP device with a higher priority becomes active. Theenhanced object tracking feature separates the tracking mechanism from HSRP and creates a separate, standalone tracking process that can be used by processes other than HSRP. This allows tracking other objects in addition to the interface line-protocol state. Aclient process, such as HSRP, can register an interest in tracking objects and request notification when the tracked object changes state.This feature increases the availability and speed of recovery of a routing system and decreases outages and outage duration.

5. Каким образом можно комбинировать несколько треков в Enhanced Object Tracking?

track <number> list boolean <and | or>

and —Specify that the list is up if all objects are up or down if one or more objects are down.
or —Specify that the list is up if one object is up or down if all objects are down.