Task 3.17 - OER Apply Policy Phase

Hi

I am trying to understand the commands based on the questions given in this task. Below are the commands in SG and then followed by my understanding of the commands used. Appreciate if any experts here who can guide me on my queries highlighted in bold below. Many Thanks.

Answers From SG:

R5:

ip prefix-list R6_LO0 permit 150.1.6.0/24

! oer-map OER 30

match ip address prefix-list R6_LO0

set delay threshold 100

set resolve delay priority 1 variance 15

set resolve utilization priority 2 variance 15

!

oer master

policy-rules OER

max-range-utilization percent 10

!

border 150.1.3.3 key-chain OER

interface Serial1/2 external

max-xmit-utilization percentage 80

!

interface FastEthernet0/0 external

max-xmit-utilization percentage 80

!

border 150.1.5.5 key-chain OER

interface Serial0/1 external

max-xmit-utilization percentage 80

!

border 150.1.2.2 key-chain OER

interface FastEthernet0/0 external

max-xmit-utilization percentage 80

!

delay threshold 200

loss relative 30

holddown 600

mode select-exit best

periodic 90

resolve utilization priority 1 variance 15

resolve delay priority 2 variance 15

max-range-utilization percent 10

 

From my breakdown and understanding of the commands based on the questions asked:

• Configure the network’s performance policy to look for the best exit for the traffic classes.

mode select-exit best

 

• OER should generate an OOP event once any link utilization exceeds 80% or when the range between link utilization is above 10%.

max-range-utilization percent 10
max-xmit-utilization percentage 80

 

• Any acceptable exit point should have a relative loss of no higher than 3% and delay no higher than 200ms.

delay threshold 200

loss relative 30 (Not sure why this is a value of 30 and how to calculate to get it)

 

• Best exit should be selected based on the minimum external utilization, and then based on the lowest delay for the prefix class.

resolve utilization priority 1 variance 15
resolve delay priority 2 variance 15

 

• Reverse the above policy logic for the prefix 150.X.6.0/24 and change the acceptable delay to 100ms.

ip prefix-list R6_LO0 permit 150.1.6.0/24
oer-map OER 30
match ip address prefix-list R6_LO0
set delay threshold 100
set resolve delay priority 1 variance 15
set resolve utilization priority 2 variance 15

 

• All exit points with performance metrics within 15% of the best exit should be considered equivalent.

(Not sure which command in SG is meant for this question)

 

• Ensure periodic re-optimization occurs every minimal time interval.

periodic 90

 

• After an OOP event, the traffic class should retain the new exit for no less than 10 minutes.

holddown 600

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