[afnog] Load Balancing Two ISP links

[Noa of Ark]

Hi mike,

I am also working on the same senario as we speak, however i would like to share some few things with you. I also hope you are meaning load balancing two 
upstream providers with a single Router.

First, are you considering the CPU and I/O resources given the fact that you are planiing to utilise a single Router for both links.One Single Router can do this job if two WAN interfaces are installed on it.

Just make sure each interface has its respective ip add from the specific Provider and configure or add one "ip nat inside source ...." statement and one default static route. After you've configured  the new interface.

If NAT is not appropriate then you will need to consider setting static routes pointing to each interface but rember to amke one parmanent.

Second, when i hear the word load balancing, some times i think of redundancy and from the Cisco Implementation point of view, i would Automatically suggest 
Two Routers and Hot Standby Routing Protocol (HSRP) be the protocol achieving this goal.

Hope this helps. Mine seems to work but i am still fine tuning it.

------

Noah Maina



Mike Barnard <mike.barnardq at gmail.com> wrote: Hi,
  
 I have a scenario that i need some assistance and insight as well.
  
 I have two E1 links, terminating on two separate routers, each from a different ISP. My current problem is that both links do have moments of unexplained blackouts.
  
 I would like to terminate both these links onto one router and do some load-balancing and fail-over on them. CISCO's OER seems like the thing that will work this out, though in what i have read, this needs at least (in my understanding) two routers. The example given in CISCO's OER manual for deployment on one router depicts two border routers, one acting as the Master Controller/Border Router, and the other the Rorder Router 
  
 Has anyone played around with OER and is there a possibility of getting it to work on one router with two serial interfaces, one loopback and one ethernet interface?
  
 Is there any other way to load-balance (and have a failover provision) on a CISCO 1700 router? I would have done IP CEF per-packet load balancing but i have no control over the end and this wont scale well with any link failure. 
  
 Appreciate any assistance.
  
 Regards

 
-- 
Mike

Of course, you might discount this possibility, but remember that one in
a million chances happen 99% of the time.
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