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New Member

bandwidth statement

Can anyone tell me why we put this on our interfaces ?

10 REPLIES

Re: bandwidth statement

Carl,

The bandwidth statement is there so that your routing protocol actually knows how much bandwith is available to use.

Patrick

New Member

Re: bandwidth statement

Hi ,

Put on the interfaces to be used as one of the fields when routing protocol calculates the best path if not given it takes the defualt speed of the port or the speed of the link which ever is less by default .

HTH

regards

Neo

New Member

Re: bandwidth statement

Hi there

So I have 2 serial connections with the same bandwidth it will load balance right, If I change this statement to a higher bandwidth will it use that link or would it un-equal cost load balance ?

New Member

Re: bandwidth statement

Hope this link helps you http://www.cisco.com/warp/public/105/46.html

regards

Neo

New Member

Re: bandwidth statement

So the "bandwidth" command under interface is just informational only and doesn't really assign bandwidth to the interface?

Cisco Employee

Re: bandwidth statement

Correct.

Otherwise, rate-limiting an interface would be so much easier ;-)

-Bobby

Hall of Fame Super Silver

Re: bandwidth statement

The bandwidth command certainly does not change the physical characteristics of the interface or affect the actual throughput of the interface.

In addition to routing protocols that use bandwidth in their calculation of metrics (EIGRP and OSPF) the bandwidth (configured or default) is used to calculate the load on the interface. Anyone who monitors load of interfaces (gathered by show command, or by SNMP for network reporting and things like MRTG) should be careful that the bandwidth assigned to the interface is realistic.

HTH

Rick

New Member

Re: bandwidth statement

I was told that the bandwidth can be changed to manipulate the path for eigrp ?

Hall of Fame Super Silver

Re: bandwidth statement

If you change the configured bandwidth it may change the calculated EIGRP metric.

For several reasons I believe that if you want to change the EIGRP calculated metric it is better to manipulate the interface delay.

HTH

Rick

New Member

Re: bandwidth statement

Hi Carl,

An interface of a router bydefault uses only 75% of available bandwith on a router.

bandwidth command enables a router to utilize the bandwidth specified in the statement.

For example you have a 2mb link, the statement would be

conf t

int s0

bandwidth 2000........(kb)

Pls rate if works.

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