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300-415 · Question #207

policy sla-class BULK_DATA loss 20 latency 300 jitter 100 ! sla-class TRANSACTIONAL_DATA loss 15 latency 50 jitter 100 ! sla-class REALTIME loss 20 latency 100 jitter 30 ! app-route-policy…

The correct answer is B. sla-class TRANSACTIONAL_DATA loss 5 latency 50 jitter 100 ! sla-class REALTIME loss 2 latency 100 jitter 30 ! The provided SLA classes for REALTIME and TRANSACTIONAL_DATA in the app-route-policy are unrealistically high for loss, and Option B corrects these values to typical industry standards.

Policies

Question

policy sla-class BULK_DATA loss 20 latency 300 jitter 100 ! sla-class TRANSACTIONAL_DATA loss 15 latency 50 jitter 100 ! sla-class REALTIME loss 20 latency 100 jitter 30 ! app-route-policy VPN-10_MPLS_AND_INET_SITES vpn-list VPN-10 sequence 1 match dscp 46 ! action backup-sla-preferred-color biz-internet sla-class REALTIME preferred-color private1 ! ! sequence 11 match dscp 34 ! action backup-sla-preferred-color biz-internet sla-class TRANSACTIONAL_DATA preferred-color private1 ! ! sequence 21 match dscp 24 ! action backup-sla-preferred-color biz-internet sla-class TRANSACTIONAL_DATA preferred-color private1 ! ! ! Which configuration completes the policy so that it works for all locations?

Options

  • Asla-class BULK_DATA loss 15 latency 100 jitter 100 ! sla-class TRANSACTIONAL_DATA loss 10 latency 300 jitter 100 !
  • Bsla-class TRANSACTIONAL_DATA loss 5 latency 50 jitter 100 ! sla-class REALTIME loss 2 latency 100 jitter 30 !
  • Csla-class TRANSACTIONAL_DATA loss 2 latency 100 jitter 100 ! sla-class REALTIME loss 15 latency 100 jitter 100 !
  • Dsla-class BULK_DATA loss 10 latency 300 jitter 100 ! sla-class REALTIME loss 2 latency 100 jitter 30 !

How the community answered

(29 responses)
  • A
    3% (1)
  • B
    83% (24)
  • C
    10% (3)
  • D
    3% (1)

Why each option

The provided SLA classes for REALTIME and TRANSACTIONAL_DATA in the app-route-policy are unrealistically high for loss, and Option B corrects these values to typical industry standards.

Asla-class BULK_DATA loss 15 latency 100 jitter 100 ! sla-class TRANSACTIONAL_DATA loss 10 latency 300 jitter 100 !

Option A increases the latency requirement for 'TRANSACTIONAL_DATA' from 50ms to 300ms, which is detrimental and inappropriate for transactional applications.

Bsla-class TRANSACTIONAL_DATA loss 5 latency 50 jitter 100 ! sla-class REALTIME loss 2 latency 100 jitter 30 !Correct

The initial policy's 'sla-class REALTIME' definition, with an allowable 'loss 20', is excessively high and inappropriate for real-time applications, which demand minimal packet loss. Similarly, 'sla-class TRANSACTIONAL_DATA' with 'loss 15' is also loose. Option B corrects these critical parameters by setting 'loss 5' for 'TRANSACTIONAL_DATA' and 'loss 2' for 'REALTIME', aligning them with typical performance requirements for these traffic types and making the policy effective for optimizing application performance.

Csla-class TRANSACTIONAL_DATA loss 2 latency 100 jitter 100 ! sla-class REALTIME loss 15 latency 100 jitter 100 !

Option C increases the latency for 'TRANSACTIONAL_DATA' from 50ms to 100ms and significantly degrades the 'REALTIME' class by increasing its loss to 15% and jitter to 100ms, making it unsuitable.

Dsla-class BULK_DATA loss 10 latency 300 jitter 100 ! sla-class REALTIME loss 2 latency 100 jitter 30 !

While Option D correctly lowers the 'REALTIME' loss, it also modifies 'BULK_DATA', which is not utilized in the provided 'app-route-policy', and does not address the high loss value for 'TRANSACTIONAL_DATA' which is used.

Concept tested: Cisco SD-WAN SLA Class Definition and Optimization

Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/sdwan-policy-config.html#_Define_SLA_Classes_for_Application_Aware_Routing

Topics

#SD-WAN#Application-Aware Routing#SLA Class#QoS

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