[afnog] Load Balancing Two ISP links

[Mike Barnard]

Hi Raymond, this is interesting. it does solve the redundancy part, but
doesn't address the load-balancing aspect of the two links. the current
problem that im facing is that any one of the two E1's unexplainable goes
dead and there is a tendency for one pipe to fill up while the other is
almost not utilised.

that is why i was looking at something that can handle both redundancy as
well as load-balance, using the existing hardware and software.

If all fails, ill play around with this and see how well it will scale. I
could try backup load 50 5 at least that ensures that the primary link hits
50%, it brings in the second link and when it falls below 5% it shuts down
the secondary link...

Thanks

On 10/15/07, Raymond Macharia <raymond at accesskenya.com> wrote:
>
>  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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-- 
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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