PFR/OER


pfr

Recently in preperation to my CCIE lab exam I have done some labbing , reading and testing of Performance routing (PfR), previously called Optimized Edge Routing (OER) which introduces a new concept into typical IP routing as we all know based on shortest path , cost etc ….

Basically current standards CAN NOT take into account usage, delay, efficient load distribution (underutilized links), and more important, actual reachability to the destination network. This could lead to traffic blackout and also to not efficient forwarding through a link with over utilization/loss/delay.

PFR/OER is a technology designed to address these issues:
•Routing based on the actual behavior of the network, and not a statically defined   metric.
•Minimize the risk of black-holing traffic by testing actual reachability.
•Effective load sharing and efficient utilization of network resources.
•Possibility to define specific profile’s for certain traffic type and/or applications.

Below is the very most basic configuration of this feature just to get it up and running which is certainly not enough for the CCIE lab and world live implementations however with this GNS3 simple set up you will be able to squeeze out I would say about 50% of what’s crucial and important. I will suggest to go onto http://docwiki.cisco.com/wiki/PfR:Technology_Overview and read/lab until you’ve logically understood and mastered OER or should I say PFR e. Just to warn you , there’s more to it than there is to OSPF in total !!

Border router:
–> Specify the “local” interface, that basically defines which interface is going to be used as source for the connections(usually loopback as it never goes down also must be reachable across the network), and a key chain to define the password that is going to be used to authenticate the messages. Border routers in our topology are R4 and R5

key chain PFR
 key 1
  key-string CISCO
pfr border
 logging
 local Loopback0
 master 10.3.3.3 key-chain PFR

 

Master Controller:

–> You need to define the key chain, and the BR of the topology. On this part you need to define which of the interfaces of the BR are going to be inside the PFR/OER domain, and its functions: internal for the inside of the network and external for outside.MC in our topology is the MC router at the left bottom 🙂

key chain PFR
 key 1
  key-string CISCO

pfr master
 logging
 !
 border 10.5.5.5 key-chain PFR
  interface Ethernet0/0 internal
  interface Ethernet0/1 external
 !
 border 10.4.4.4 key-chain PFR
  interface Ethernet0/1 external
  interface Ethernet0/0 internal

 

Enjoy!

Tom

 

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About ccie4all
Hello, and welcome to the first post of my CCIE blog This blog has got one simple goal and that is to improve our skills in Cisco Networking field so we can become best engineers on a job market. Wordpress Blog https://ccie4all.wordpress.com/ information about the changes made to Gns3 BGP , MPLS and R&S CCIE labs. In order to access and download all provided materials and receive important updates from Gns3 BGP , MPLS and R&S CCIE labs under GNS3 tab in the main header please go ahead and subscribe to https://ccie4all.wordpress.com/ ! All other posts have not been affected and can be accessed at any given time. Enjoy ! Tom

2 Responses to PFR/OER

  1. mercadam says:

    How can I subscribe to your blog so that I may have access to the GNS3 topology?

    -Angel

    • ccie4all says:

      Hello Angel , no problem at all , simply type in your email address under “Follow Blog via Email” on the right hand side and in a few moments you will receive a password to unlock GN3 , CCIE/BGP/MPLS topologies.

      Tom

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