So with OC3, packet over sonet is the layer two? Or ATM? Depending?
Chuck
-----Original Message-----
From: Brian [mailto:[EMAIL PROTECTED]]
Sent: Monday, November 13, 2000 3:19 PM
To: Chuck Larrieu
Cc: Billy Monroe; [EMAIL PROTECTED]
Subject: RE: OSPF Load Balance/Metric
On Mon, 13 Nov 2000, Chuck Larrieu wrote:
> 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.
It can actually do up to 6 I beleive, just four without any configuration
needed.
>
> Perhaps the interviewer meant traffic shaping? Perhaps the interviewer was
> confusing the (E)IGRP metric which includes a component called "delay" ?
Perhaps the interviewer is lost :)
>
> 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?
OC3 is a layer 1 technology, its just a bitstream, so no.
>
> 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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-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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