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New Member

route balancing problem


i have a problem. My client has got to links from two diff ISP's . one is 128 kbps and the other one is 512 Kbps. they r terminated at cisco 1721 the whole lan traffic goes to Pix 515e, there they r nated to single Public Ip , then that traffic goes to the router.

Now the problem is that client wants the traffic to do load balancing ,so that he can use both the links . he also wants that he can switch from one link to another link without any config changes in case if one link goes down.

Please tell me the possible ways to do this as i think the problem is that the pix is doing nat to a single ip , so my router will see only a single ip so how can we implement load balancing or Pbr.

VIP Purple

Re: route balancing problem


you could try the following configuration (assuming your are using two serial interfaces for the connections to your ISPs):

ip cef


interface Serial0

description Connection to ISP1

ip address x.x.x.x y.y.y.y


interface Serial1

description Connection to ISP2

ip address x.x.x.x y.y.y.y


ip route Serial0

ip route Serial1

This would allow (outbound only) per-destination load-balancing; in addition, if one link goes down, all traffic will automatically be routed over the remaining link.



New Member

Re: route balancing problem

So I gather the command ip cef load balances these according to link speed ? what would the ip load-share per packet/destination do, could you use that , or is that just for multilinks ?

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