Link Redundancy between two Internet Link

Unanswered Question
Mar 8th, 2007

HI All, I have two internet links with two different subnets from a ISP. Now I have to use both the link for internet want to do load balance & want to configure redundancy between these links. I have two routers & two firewalls. Can any one help to configure it so that I can achieve redundancy & do load balancing between them. Remember I have two different public IP subnet from same ISP.

Ninja

I have this problem too.
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abhishek_nandavat Thu, 03/08/2007 - 03:54

Hi Nitin,

For load balancing the internet traffic, you can go for configuring policy based routing. Using policy based routing you can direct the packets to take different paths. This way you can also prioritise your traffic like giving preferential treatment to different traffic.

For more on PBR have a look these links -->

http://www.cisco.com/warp/public/732/Tech/plicy_wp.htm

http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/qos_c/qcpart1/qcpolicy.htm

Hope this helps....

Regards,

AbhisheK

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Danilo Dy Thu, 03/08/2007 - 04:00

Hi, ask your ISP to do eBGP peer with you using private AS. First link will be primary for first subnet and the second link will be secondary for it. Second link will be primary for second subnet and the first link will be secondary for it. Distribute the two subnets to your hosts. This will make your incoming traffic load sharing using BGP and make your link redundant.

For outgoing, use GLBP in your routers as your firewall gateway. This will make your outgoing traffic load balance. http://www.cisco.com/en/US/products/ps6550/products_white_paper09186a00801541c8.shtml

I already did this thrice, it should work for you as well. If I have time tomorrow, I'll post a diagram how to do it :)

jain.nitin Thu, 03/08/2007 - 11:20

HI Thanks for your reply but I could not understand ur point. See I have got two diff-diff public subnet. & have two firewalls. Can you just give me detail explaination so that i can understand it better.

Thanks a lot.

Ninja

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