Just to correct this, IGRP and EIGRP both use bandwidth, delay, load,
reliability, and MTU as components in their calculation of metrics. One
reason why one need not redistribute one into the other with provisions for
redistributing route metrics.
-----Original Message-----
From: Eneas Quintero Guerini [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 13, 2000 3:23 PM
To: 'Chuck Larrieu'; Billy Monroe; [EMAIL PROTECTED]
Subject: RE: OSPF Load Balance/Metric
cost = 10 at the power of 8 / bandwidth
cost is the metric that ospf uses... Eigrp uses a composite metric based on
an equation for k1, k2, k3, k4 and k5...
... igrp uses bandw and delay... Rip uses hop count
Regards
Eneas
-----Original Message-----
From: Chuck Larrieu [SMTP:[EMAIL PROTECTED]]
Sent: Lunes 13 de Noviembre de 2000 05:45 PM
To: Billy Monroe; [EMAIL PROTECTED]
Subject: RE: OSPF Load Balance/Metric
Hhmmmm..... don't ever recall reading that OSPF took "congestion" into
consideration when creating its routing databases.
OSPF will load balance across up to four equal cost paths. There might be
some issues with per packet versus per destination, depending upon the type
of caching enabled or not enabled on the equipment.
Perhaps the interviewer meant traffic shaping? Perhaps the interviewer was
confusing the (E)IGRP metric which includes a component called "delay" ?
Also, being ignorant of such rich kid toys as OC3, are there mechanisms
within OC3 to deal with congestion, as is true with frame relay?
Chuck
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Billy Monroe
Sent: Monday, November 13, 2000 1:45 PM
To: [EMAIL PROTECTED]
Subject: OSPF Load Balance/Metric
Hello:
An interviewer asked me what happens if you have two paths to a Router, both
using OC-3, and routing protocols is OSPF.
I said that OSPF is a link state protocol and its metric is "Cost", which is
10^8/Bandwidth. Load balance is enabled by default on OSPF, so packets will
be load balanced "per destination" (it should be configured if 'per packet'
is required).
The guy then told me that I should take "Congestion" into consideration.
How can this be ? I know that EIGRP or IGRP may be configured to use Load as
a metric, thus congestion would be take into account. I couldn't find any
documentation showing that OSPF takes congestion as a metric.
Please let me know if I am wrong.
Thanks,
Billy Monroe
CCNA, Compaq ASE
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