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Routing WAN traffic using policy based routing on Catalyst 3560 with 2 WAN/ISP links

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  • Routing WAN traffic using policy based routing on Catalyst 3560 with 2 WAN/ISP links

    Hi folks -

    >2 Sites Singapore and NY (see attached)

    >NY hosts citrix servers and wan apps used by Singapore users.

    >Singapore has 2 ISP connections, ISP A and ISP B connected by site to site vpn.

    >ISP B VPN connection to NY out performs ISP A.

    Recently the ISP B data circuit in Singapore has been relocated to the same server room as ISP A and both are physically connected to the same cisco 3560 switch.

    Currently each lan is using its own gateway.

    I would like to route all traffic originating from both SG LANs with a destination of NEW YORK (192.168.1.0 / 2.0 / 3.0) via ISP B to improve performance of WAN apps. This can be done by specifying NY subnets.

    ** For all other traffic - Local LANs should continue to use their own gateways / ISPs.

    Cisco recommended using policy based routing. I need assistance in configuring the switch with correct config. Swtch has been upgraded to ip services

    Any help greatly appreciated.

    Ed
    Attached Files

  • #2
    Re: Routing WAN traffic using policy based routing on Catalyst 3560 with 2 WAN/ISP l

    Hi EdRoche,

    First I am assuming your switch is doing both layers 2 and 3. To do Policy Based Routing you have to create route maps. You define your traffic and give it an action.

    1.) For instance create access-lists for the traffic you wan to permit to cross the new linke
    2.) the create a route-map and give it a name and a priority (i.e route-map ISPB
    3.)define a clause for the route-map, in your case you want use the match clause for any traffic from the two access-list
    4.) apply the route map to an interface (or VLAN on your L3 switch)

    This is just a rough explaination and I might have forgotten a step or two but you get the idea. Hope that helps to get you started. You can search cisco's website for more detailed instructions.

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    • #3
      Re: Routing WAN traffic using policy based routing on Catalyst 3560 with 2 WAN/ISP l

      http://supportwiki.cisco.com/ViewWik...ith_route-maps


      This will surely work .

      Cheers
      DT

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