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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