On Sat, 1 Mar 2003, Cisco Nuts wrote:
> Hello,If the clock rate has been configured for 64000 on one side of the
> link (home lab), does that mean that the bandwidth needs to be set to
> 64000 on both sides of the link using the bandwidth command so that
> routing protocols like Ospf correctly compute the metrics? After all,
> isn't the default bandwidth (1.544M) cosmetic inspite of the link having
> been configured with clock rate = 64000?Thanks for the
> clarification.Sincerely,CN
Yes, you're correct.
Clocking (on the DCE side) specifies the bandwidth of a link while the
'bandwidth' statement is used for calculating routing netrics, the 'show
int' load counter, etc.
I can think of a few reasons why IOS doesn't just use the clocked amount
as the bandwidth statement:
- some interfaces (namely subinterfaces - ATM VCs, Frame VCs, etc) don't
get a clock per se, but still need a concept of bandwidth.
- A dodgy hack to allow people to easily modify routing metrics.
- The DCE device may provide a clock that is higher than the actual link
speed. A good example is an Async interface with a modem - the speed
between the router and modem is 115Kbit, but the modem may only connect at
56Kbit.
Rgds,
- I.
--
Ian Henderson CCNA, CCNP
Senior Network Engineer, Chime Communications
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=64159&t=64147
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