300-415 · Question #110
Refer to the exhibit. The ge0/0 interface connects to a 30-MB link. A network administrator wants to always have 10 MB available for high priority traffic. When lower-priority traffic bursts exceed…
The correct answer is A. policy policer bursty-traffic rate 1000000 burst 20000 exceed remark access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept. To redirect traffic when it exceeds a certain burst threshold, a policer configured with the exceed remark action is used, which marks the exceeding traffic for a subsequent data policy to then redirect it to an alternative interface.
Question
Exhibit
Options
- Apolicy policer bursty-traffic rate 1000000 burst 20000 exceed remark access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
- Bpolicy policer bursty-traffic rate 100000 burst 20000 exceed continue access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
- Cpolicy policer bursty-traffic rate 10000 burst 20000 exceed drop access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
- Dpolicy policer bursty-traffic rate 10 burst 20 exceed remark access-list policer-bursty-traffic sequence 10 match source-ip 56.0.1.0/24 action accept policer bursty-traffic default-action accept
How the community answered
(60 responses)- A83% (50)
- B3% (2)
- C5% (3)
- D8% (5)
Why each option
To redirect traffic when it exceeds a certain burst threshold, a policer configured with the `exceed remark` action is used, which marks the exceeding traffic for a subsequent data policy to then redirect it to an alternative interface.
The `policer bursty-traffic` is defined with an `exceed remark` action, which re-marks packets that exceed the rate and burst. This re-marking allows a subsequent policy (not explicitly shown) to identify this traffic and redirect it to the `ge0/1` interface as required.
The `exceed continue` action means that traffic exceeding the policer rate is forwarded without any modification or consequence, thus failing to implement the redirection requirement.
The `exceed drop` action would discard traffic that exceeds the policer rate, which does not meet the requirement to redirect the traffic to `ge0/1`.
The `rate` and `burst` values are extremely low (10 bps and 20 bytes), which would police traffic far below the intended 20 MB threshold for redirection.
Concept tested: QoS policer for traffic redirection
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/sdwan-xe-gs-book/m-sdwan-policies.html#Cisco_Reference.dita_06071ef2-921d-408a-b94f-4ee64797ed8f
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