On Mon, 13 Nov 2000, Chuck Larrieu wrote:
> So with OC3, packet over sonet is the layer two? Or ATM? Depending?
nod......some could argue ATM as layer 2, 2.5, 3, whatever.........but yes
OC3 is just a media type.
Brian
>
> 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)
>
>
-----------------------------------------------
Brian Feeny, CCNP, CCDP [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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