what happens if we change bandwidth only on one side of the serial link

[singhankit685]

what happens if we change bandwidth only on one side of the serial link and on the other side is default

example:on on side we changed to 4mbps and on the other side it is default value of 1544kbps or any other value but not same ??

[Richard Burts]

For the specific question that you ask the answer is that if you change the bandwidth on only one side but not the other side the interface will continue to operate as it has. Processes that actually use the bandwidth value (such as calculating the metric for routing protocols OSPF and EIGRP) will calculate different results on each side of the link. Whether that actually changes any behavior on the link would depend on specifics of the topology which we do not know and so can not answer.

If you had asked the question of what happens if you change the clock rate on one end but not the other then the answer would have been that the link could not come up if the clock rate (speed) was different between the two ends.

HTH

Rick

[singhankit685]

@Richard .....but we apply the clock rate command only on one side of the interface that is dce and the other side which is dte ,we do not apply clock rate command ??

[Richard Burts]

Since we do want the serial link to come up it is usually set up as you discuss where you set the clock rate on only one side. So let me change my explanation a bit and instead of suggesting that you change the clock rate let me phrase it this way - if the clock rate on one end were different from the clock rate on the other end then the link would not come up (without specifying how the clock rate got different).  This is based on my assumption that what you really wanted to ask in your original question was what would happen if the link speeds were different. And part of the point that I am making is that bandwidth is not the same as link speed.

If you really did mean to ask about different bandwidth setting on each end then my first response is the answer that you look for. Different bandwidth would impact processes that use bandwidth (such as routing protocol metrics, network management measurement of link utilization, etc) but the physical operation of the serial link would not be impacted.

HTH

Rick

[singhankit685]

that answers my question thank you sir...@richard burts.

[Richard Burts]

You are welcome. I am glad that my explanation did answer your question.

HTH

Rick