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Home > Archive > alt.certification.cisco > April 2004 > load balancing on 3 DSL lines?
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load balancing on 3 DSL lines?
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| Hi all,
My client purchased a Cisco 2600 with NM of four ethernet ports.
He will start by connecting three ethernet ports to three different DSL
lines.
What kind of load balancing can we achieve by doing this?
Can we configure the router with three "ip route 0.0.0.0 0.0.0.0" pointing
to three different default gateways and achieve load balancing?
What about QOS, if we want only FTP on the first DSL line and HTTP traffic
only to the second line, can that we achieved also?
Please advice.
Thanks,
Al
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| Sartan Dragonbane 2004-04-20, 10:25 pm |
| Don't see why you would want to, unless.. but whatever
Just give it the same metric. (ip route 0.0.0.0 0.0.0.0 <gatewayip>
<metric> )
Better hope it's the same network at the other end :P
"al" <al@somplace.com> wrote in message
news:Q9jhc.39119$il.21386@newssvr29.news.prodigy.com...
> Hi all,
> My client purchased a Cisco 2600 with NM of four ethernet ports.
> He will start by connecting three ethernet ports to three different DSL
> lines.
> What kind of load balancing can we achieve by doing this?
> Can we configure the router with three "ip route 0.0.0.0 0.0.0.0" pointing
> to three different default gateways and achieve load balancing?
> What about QOS, if we want only FTP on the first DSL line and HTTP traffic
> only to the second line, can that we achieved also?
> Please advice.
> Thanks,
> Al
>
>
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| Walter Roberson 2004-04-20, 11:25 pm |
| In article <Q9jhc.39119$il.21386@newssvr29.news.prodigy.com>,
al <al@somplace.com> wrote:
:My client purchased a Cisco 2600 with NM of four ethernet ports.
:He will start by connecting three ethernet ports to three different DSL
:lines.
:What kind of load balancing can we achieve by doing this?
:Can we configure the router with three "ip route 0.0.0.0 0.0.0.0" pointing
:to three different default gateways and achieve load balancing?
Unless the ISP is actively cooperating by supporting BGP (or equivilent),
or the ISP is one of the rare ones that supports MLPPP over DSL,
then the kind of load-balancing you can configure is to have some
degree of control over balancing of -outgoing- packets, but no control
over -incoming- packets.
You can't just order up <N> lines and expect to be able to do
bi-directional load balancing: keep in mind that as far as the other
end is concerned, only one of the <N> links is going to have the return
route for your network block.
I am being a little harsh, though: if you arrange NAT on the <N>
lines so that the outgoing packets on the lines have source addresses
that are publically routed to that line, then at least the replies will
go back to the same line. That's not particularily good load balancing
once you get into big ftp's or http replies...
:What about QOS, if we want only FTP on the first DSL line and HTTP traffic
 nly to the second line, can that we achieved also?
You still have the return-address problem: unless you arrange with
the ISP or you do tricks like the NAT I mention, then all replies
are going to come back through one single connection. But you don't
need QoS to send different kinds of traffic to different interfaces:
you use policy routing for that.
The phrase "my client purchased" suggests to me your client bought used
equipment (and perhaps might not have a legal right to use IOS), and
that possibly you are speaking of a true 2600 rather than a 2600XM.
If so, there might be an older IOS on it. You might want to double
check with the Feature Navigator that all the policy routing clauses
you need are supported on that model in that IOS version.
--
Is "meme" descriptive or perscriptive? Does the knowledge that
memes exist not subtly encourage the creation of more memes?
-- A Child's Garden Of Memes
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"al" <al@somplace.com> wrote in message
news:Q9jhc.39119$il.21386@newssvr29.news.prodigy.com...
> Hi all,
> My client purchased a Cisco 2600 with NM of four ethernet ports.
> He will start by connecting three ethernet ports to three different DSL
> lines.
> What kind of load balancing can we achieve by doing this?
> Can we configure the router with three "ip route 0.0.0.0 0.0.0.0" pointing
> to three different default gateways and achieve load balancing?
> What about QOS, if we want only FTP on the first DSL line and HTTP traffic
> only to the second line, can that we achieved also?
> Please advice.
> Thanks,
> Al
>
>
The following would work on T1 lines, not 100% sure about DSL:
As far as the FTP and HTTP, you will need to use acl's and apply them to the
appropriate interfaces. For the rest of the traffic, you would need 3
default routes, CEF enabled and the 'ip load-sharing per-packet' on each
interface.
For return load-sharing (service provider to you), all 3 connection will
need to terminate on the same service provider router to achieve
load-sharing.
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