[afnog] Load Balancing Two ISP links

[Raymond Macharia]

Hi Mike,
I currently use BGP to achieve what you are trying to do however if that 
seems complicated there is a simple command I used some years back and 
it worked well for me, below is a template.
The lines of interest are the ones that start with the word backup. What 
the first line did is provide redundancy so when this link went down 
traffic would be redirected to the other link.
The second line is for load sharing and this means that if the first 
link gets to 80% it invokes the second link and if the link goes down to 
60% it shuts down the second link.
You can play around with the percentages to get the right mix for you. 
Note that you still have the two defaults to the two links below.


interface Serial0/0
 description Internet Link1
 bandwidth 1024
* backup interface Serial0/1
 backup load 80 60*
 ip address x.x.x.x 255.255.255.252
 no ip redirects
 no ip directed-broadcast
 no ip proxy-arp
 ip nat outside
 encapsulation ppp
 no cdp enable
!
interface Serial0/1
 description Internet Link2
 bandwidth 512
 ip address x.x.x.x 255.255.255.252
 no ip redirects
 no ip directed-broadcast
 no ip proxy-arp
 encapsulation ppp
 fair-queue 64 256 0
 no cdp enable
!
ip route 0.0.0.0 0.0.0.0 Serial0/0
ip route 0.0.0.0 0.0.0.0 Serial0/1

Mike Barnard 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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