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Community Member

Order of router operation

Hi Friends,

I would like to know what is the order in which the router processes a packet. For eg. when a router receives a packet, it would check the routing table, ACL, QOS, NAT etc ... What is the order in which these operations are carried out. The one that i found from cisco website seems to be specific to only NAT & QoS operations but I would like to know in general. Thanks in advance for your assistance.

Regards,

Manoj

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Re: Order of router operation

Hi Manoj,

This link should help.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080133ddd.shtml

HTH,Please rate if it does.

-amit singh

4 REPLIES
Cisco Employee

Re: Order of router operation

Hi Manoj,

This link should help.

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080133ddd.shtml

HTH,Please rate if it does.

-amit singh

Community Member

Re: Order of router operation

Hi Amit,

The link that you provided only mentions NAT order of operation. But in general, if there is NAT, QOS, ACL's etc configured, which one takes precedene first and how the order of operations goes on. This is what i am looking for. Thanks!

Regards,

Manoj

Re: Order of router operation

Manoj,

The link actually tells all the operations that a router performs when a packet enters it and not just when NAT is configured.

As per the document ACL will be the 3rd in order whether nat is configured or not.

If NAT is configured then that action would be taken only after all the above actions are already taken by the router

HTH

Narayan

Community Member

Re: Order of router operation

Hi Amit/ Narayan,

I was a bit lethargic to go through the complete document. I have found the info. in the page now. Thx for your help guys.

Regards,

Manoj

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