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BGP Load sharing with 2 ISP

Hi,

We need to load share the traffice over both the ISP links. We have shared the public AS number between both the ISP & at the CE end, both links are terminated on to 2 diffrent physical routers.

How to configure the same.

Regards

Harsha

BGP Loadsharing.ppt

1 REPLY

Re: BGP Load sharing with 2 ISP

Hi Harsha,

Well you have used HSRP and BGP also at you core router..now hsrp will prefer only one router at a time to select

the virtual IP...so to tackle with hsrp you need to create two hsrp group. one will be standby for other and that standby will be primary for

next group..this way you will be able push traffic upto two core router.

Now for BGP consider incoming and outgoing traffic..

for incoming traffic you need to divide your LAN IP in two parts (if it is /23 need to create two /24 pools  but it it is /24 only there is limitation)

announce one /24 from one ISP and other /24 from other ISP...but don't forget to announce /24 from both ISP as a backup

for outgoing traffic if you are learning default route only i don't think it will be load shared..but if you are receiving full bgp or partial bgp you can do load

share by playing with as-path along with some regular expresion.

If you can share config details there could be more focus on solution

hope this is useful

Regards

Mahesh

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