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Article #1849

OSPF path costs vs. Bandwidth

#1849
From: John Luke Mills
Date: Tue, 26 Jan 1993 20:02
34 lines
1828 bytes
In my mostly OSPF network some of the OSPF interface costs are not
what I expect.  The interface costs of all my serial links are 1562.
This is the correct value for 64kbps links.  I don't have any 64kbps
serial links.  I have lots of 56's, some full t1's, and fraction t1's.
I did not set any ospf costs and just took the defaults.

The manual states that different physical interfaces have different
defaults and provides a table of some common link speeds and metrics.
It also states that the "no ip ospf cost" command resets the path cost
for an interface to the default value.

I took this to mean that by default ospf would determine the link
speed of each interface and set the metric accordingly, but this
didn't happen.

It appears that this is not related to the bandwidth parameter for the
interfaces.  I never use any bandwidth commands and all my serial
links report a bandwidth of 1544kbs, that for a full t1 link.

Is OSPF supposed to be able to set the interface cost itself?  

If so, where does it get its information?

If it is the bandwidth parameter, is this supposed to be set manually?

On DTE interfaces is the bandwidth parameter supposed to be set
automatically by looking at the provided clock?

Most of my routers run 9.0(1) if it matters.  Obviously this isn't a
big deal since I can manually set any costs I want where it matters.
I would like to know what is really supposed to be happening.

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Message-ID: <1993Jan26.200238.16969@cass.ma02.bull.com>
Path: arc1-ca.pugleaf.net!sparky!uunet!stanford.edu!agate!spool.mu.edu!cass.ma02.bull.com!jmills

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Newsgroups: comp.dcom.sys.cisco
Path: arc1-ca.pugleaf.net!sparky!uunet!stanford.edu!agate!spool.mu.edu!cass.ma02.bull.com!jmills
From: jmills@cass.ma02.bull.com (John Luke Mills)
Subject: OSPF path costs vs. Bandwidth
Message-ID: <1993Jan26.200238.16969@cass.ma02.bull.com>
Organization: Bull World Wide Information Systems Inc.
Date: Tue, 26 Jan 1993 20:02:38 GMT
Lines: 38