642-642 Policing Question

Answered Question
Jan 13th, 2008

In preparation for 642-642 can anyone help me by advising what the default actions are when using the policing command?


For example a three-colour policer can be set up by manually configuring values for Bc and Be however the violate-action is optional. If you configure Bc and Be but specify no violate-action, what does a router do with violating traffic?


Similary, Example 6-10 in the Exam Certification Guide shows the command:

police cir percent 25 bc 500 ms pir percent 50 be 500 ms


What are the default conforming and exceeding actions in this case?


Any help greatly appreciated.

Many thanks,


Mike

Correct Answer by mounir.mohamed about 9 years 1 month ago

Simply, The default conform action is Transmit, while the default exceeding action = DROP


In the first example, any exceeding traffic (Traffic over the CIR / over conform) will be treat as per the exceeding action (default = drop)


In the second example the Conform action will be taken for the traffic that equal or less than the CIR (Default = Transmit), exceeding action will taken based on the value of PIR (default = drop)



policy-map test

class test

police cir percent 25 bc 500 ms pir percent 50 be 500 ms


R5#show policy-map test

Policy Map test

Class test

police cir percent 25 bc 500 ms pir percent 50 be 500 ms

conform-action transmit

exceed-action drop

violate-action drop


Pls rate helpful posts.


Best Regards,

Mounir Mohamed

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Correct Answer
mounir.mohamed Sun, 01/13/2008 - 12:26

Simply, The default conform action is Transmit, while the default exceeding action = DROP


In the first example, any exceeding traffic (Traffic over the CIR / over conform) will be treat as per the exceeding action (default = drop)


In the second example the Conform action will be taken for the traffic that equal or less than the CIR (Default = Transmit), exceeding action will taken based on the value of PIR (default = drop)



policy-map test

class test

police cir percent 25 bc 500 ms pir percent 50 be 500 ms


R5#show policy-map test

Policy Map test

Class test

police cir percent 25 bc 500 ms pir percent 50 be 500 ms

conform-action transmit

exceed-action drop

violate-action drop


Pls rate helpful posts.


Best Regards,

Mounir Mohamed

mike_riggall Sun, 01/13/2008 - 15:26

Many thanks for your clear explanation which makes perfect sense of course.


I think perhaps the moral of the thread is that it helps to have access to a router to try these things on!


Best regards,


Mike

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