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    Otimized Edge Routing (OER) also known as Performance Routing (PFR) ia an alternative way of routing traffic. OER/PfR selects a path based on the performance of the path and hence optimizing the connections. For example, an OER enabled edge router connected with two ISP can perform load sharing by transmitting data to 2nd ISP when it detect conjestion over 1st ISP link. OER/PfR can measure parameters such as delay, throughput, loss and reachability, among others, pre-determined policies to select the best performing path, and route packets accordingly.


    OER has two components: a Master Controller (MC) and one or more Border Routers (BR). The Master Controller is the decision maker, whereas the border routers are edge routers with exit interfaces at the network edge. Border routers are either used to access the Internet or used as WAN exit links. OER communication between the master controller and the border routers is carried separately from routing protocol traffic. This communication is protected by Message Digest 5 (MD5) authentication. Each border router has both an external interface, which is connected, for example, to an ISP by a WAN link, and an internal interface that is reachable by the master controller.


    • Understanding of IP Routing Protocol
    • CEF must be enabled on participating routers


    In this document Router R1, R2 and R3 forms an OSPF neighbor relationshio (Area 0) and acting as internal network.

    Router R1 from OER perspective being the Master Controller (MC) and the Border Router (BR). There could be scenarios where MC and BR are two different identities. However for simplicity I have choosen R1 to act as both i.e. MC and BR. The two components taks over TCP connection authenticated via MD5. Router R1 has redundant connection to R4 through interface (FastEthernet 1/0 and Serial 0/0).

    Router R4 is the provider router which is injecting default route into R1 via FastEthernet 0/0, making this path primary and  Serial 0/0 secondary path.

    NOTE: All configurations are tested on Cisco 3745 Router operation on IOS Version 12.4(15)T14  Advance IP Services version.

    1. Configure R1 as the OER Master Controller and Border Router.
    2. FastEthernet 0/0 and FastEhetnet 0/1 interface of R1 are marked as Internal Interface.
    3. FastEthernet 1/0 and Serial 0/0 interface of R1 are marked as External Interface.
    4. Any ICMP traffic to (Lo0 of R4) going from R1 should use the primary link (i.e through FastEthernet 1/0 interface of R1).
    5. Any telnet traffic (port 19) to (Lo1 of R4)going from R1 should use the secondary link (i.e through Serial 0/0 interface of R1).

    Topology diagram

    Topology Diagram.bmp



    R1-->MC and BR Configuration


    key chain OER

    key 1

       key-string CISCO


    oer master

    policy-rules OER



    border key-chain OER

      interface Serial0/0 external

      interface FastEthernet1/0 external

      interface FastEthernet0/1 internal

      interface FastEthernet0/0 internal



      periodic-interval 0

      monitor-period 1

    no max range receive

    mode route control


    oer border

    local Loopback0

    master key-chain OER


    R1--> OER Policy Configuration


    ip access-list extended ICMP-TRAFFIC

    permit icmp any host

    ip access-list extended TELNET-TRAFFIC

    permit tcp any host eq chargen


    oer-map OER 10

    match traffic-class access-list ICMP-TRAFFIC

    set next-hop


    oer-map OER 20

    match traffic-class access-list TELNET-TRAFFIC

    set next-hop



    Note: For complete configurations, see attached text files (Config-R1, Config-R2, Config-R3, Config-R4).

    Verification Commands

    show oer master

    show oer master.bmp

    Note: The output is truncated, for complete output of the command "show oer master" see attached file

    show oer master border detail

    show oer master border detail.bmp

    show oer master traffic-class

    show oer master traffic-class.bmp


    Setting Up OER Network Components

    Optimized Edge Routing Configuration Guide, Cisco IOS Release 12.4T

    Saqib Raza

    awesom work! keep it up Sunil


    Thank you so much. Simplified version of OER.

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