To All:
[ElephantChild wrote:]
[You want to load-balance 30% (100% - 70% load threshold needed for ISDN to
kick in) of your T1's bandwidth, which is about 450 Kbits/sec., with 1 ISDN
channel, which will give you 1/7 at best of that bandwidth.]
I am not sure I understand what you are saying?
Isn't the "BACKUP LOAD {enable-threshold | NEVER} {disable-threshold |
NEVER}" command specifying when the backup interface will be kicked in, and
dropped? It has been a while but looking through the docs again it seems
that the BRI will kick in at 70% util (input or output 5 minute moving
average). It will remain up until the COMBINED utilization of the two
(input or output 5 minute moving average) drops bellow 30% of the S1/0
bandwidth.
I donn't see how the backup delay really has anything to do with the
"loadsharing" issue?
As I write this I find that I have some questions?
### It has been a while, and the Docs are a little vague###
1. Can either the input or output utilization start the backup?
2. Once the backup is enabled do BOTH the input and output utilizations have
to be bellow the disable-threshold to drop the backup.
Kurgan
"ElephantChild" wrote:
>
> On Thu, 19 Apr 2001, Paul L Holloway wrote:
>
> > I have a customer wanting his ISDN line(BRI)to take up the slack when the
> > utilization on his T1 gets to high. He has a 3640 router. I know the load
> > balancing considerations for routing protocols and am suggesting he run
> > EIGRP as his IGP since OSPF won't load balance across two "unequal"
paths.
> > The config. on his serial I believe would be:
> >
> > int S1/0
> > ip address x.x.x.x x.x.x.x
> > no ip redirects
> > no ip directed-broadcast
> > no ip proxy-arp
> > encapsulation ppp
> > no ip route-cache distributed
> > no fair-queue
> > no cdp enable
> > backup delay 30 60
> > backup int BRI1/0
> > backup load 70 40
> >
> > Are there any other snags or problems I may run into with this setup?
> > Thanks in advance.
>
> Hmm, you configured it as a serial interface, wo I assume that the whole
> bandwidth of your T1 goes to a single destination (eg, ISP router port).
> You want to load-balance 30% (100% - 70% load threshold needed for ISDN
> to kick in) of your T1's bandwidth, which is about 450 Kbits/sec., with
> 1 ISDN channel, which will give you 1/7 at best of that bandwidth.
>
> So the main snag, I would think, is that your ISDN won't help that much.
> OTOH, it will come handy when your T1 gets acquainted with a backhoe,
> which also appears to be one of your design goals, since you put in a
> backup delay. Depending on how you rank these design goals, you'll get a
> satisfied customer or an irate one.
>
> --
> "Someone approached me and asked me to teach a javascript course. I was
> about to decline, saying that my complete ignorance of the subject made
> me unsuitable, then I thought again, that maybe it doesn't, as driving
> people away from it is a desirable outcome." --Me
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