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Optimized Edge Routing (OER): Configuration Example

     

    Introduction

    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.

    Prerequisite

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

    Summary

    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  0.0.0.0/0 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.

    Objective
    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 4.4.4.4/32 (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 44.44.44.44/32 (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

    Configuration

     

    R1-->MC and BR Configuration

     

    key chain OER

    key 1

       key-string CISCO

    !

    oer master

    policy-rules OER

    logging

    !

    border 1.1.1.1 key-chain OER

      interface Serial0/0 external

      interface FastEthernet1/0 external

      interface FastEthernet0/1 internal

      interface FastEthernet0/0 internal

    !

    learn

      periodic-interval 0

      monitor-period 1

    no max range receive

    mode route control

    !

    oer border

    local Loopback0

    master 1.1.1.1 key-chain OER

     

    R1--> OER Policy Configuration

     

    ip access-list extended ICMP-TRAFFIC

    permit icmp any host 4.4.4.4

    ip access-list extended TELNET-TRAFFIC

    permit tcp any host 44.44.44.44 eq chargen

    !

    oer-map OER 10

    match traffic-class access-list ICMP-TRAFFIC

    set next-hop 172.14.14.4

    !

    oer-map OER 20

    match traffic-class access-list TELNET-TRAFFIC

    set next-hop 172.16.14.2

    !

     

    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

    References

    Setting Up OER Network Components

    Optimized Edge Routing Configuration Guide, Cisco IOS Release 12.4T

    Comments
    New Member

    awesom work! keep it up Sunil

    New Member

    Thank you so much. Simplified version of OER.

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