Cisco Multinet Setup Help

Posted on 2004-10-22
Last Modified: 2006-11-17

We currently have a single T1 from our current provider and I am in the process of moving to a new provider and bonding two new T1's together with Multilink PPP. Our router is a 7204 VXR with a PA-MC-T3 card going into a 2916XL switch. Right now I have both connections up and I have the subnet our new provider gave us set as a secondary ip subnet on the 7204's ethernet card.

My idea is to keep both provider connections up so I can migrate websites, email, dns etc. but am having some routing probs I think. How can I setup my default routes to route traffic in and out their respective gateways? I tried something like this:

ip route <current backbone provider gateway>
ip route <new backbone provider gateway>

but when I tested it on one of the servers, it wouldn't work. It would act like it was loading or yahoo but then crap out. The other thing I was thinking about was trying to setup a VLAN, but wasn't sure if I needed to go through that trouble.

Any help would greatly be appreciated.


Scott MacDonald
Question by:eureeka
    1 Comment
    LVL 13

    Accepted Solution

    You could try using route maps, as what is likely happening is the addresses for one ISP are trying to use the connection for the other ISP and getting lost, so you need to set it up so each ISP’s addresses are only routed to their respective router. I think you would set it up something like this, but it’s been awhile since I have done anything like that, as I have a wide selection of spare routers, and usually employ the use of one when changing ISP’s.

    Interface F1/0
     ip address
     ip address secondary
     ip policy route-map isp1
     ip policy route-map isp2
    access-list 10 permit
    route-map isp1 permit 10
     match ip address 10
     set ip next-hop

    access-list 11 permit
    route-map isp2 permit 10
     match ip address 11
     set ip next-hop


    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone. Privacy Policy Terms of Use

    Featured Post

    How to run any project with ease

    Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
    - Combine task lists, docs, spreadsheets, and chat in one
    - View and edit from mobile/offline
    - Cut down on emails

    While it is possible to put two routes in place with the secondary having a higher metric, this may not always work. In the event of a failure that does not bring down the physical interface on the router the primary route is not removed. There is a…
    The Cisco RV042 router is a popular small network interfacing device that is often used as an internet gateway. Network administrators need to get at the management interface to make settings, change passwords, etc. This access is generally done usi…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
    After creating this article (, I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…

    877 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    20 Experts available now in Live!

    Get 1:1 Help Now