> Why Change the 'Bandwidth' parameter is not recommend to manipulate EIGRP Distance....? - Sarada Hettiarachchi
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Friday, May 20, 2016

Why Change the 'Bandwidth' parameter is not recommend to manipulate EIGRP Distance....?

Change the 'Bandwidth' parameter is not recommend to manipulate EIGRP Distance [Metric = Bandwidth + Delay)*256] because that may cause to QoS and other routing protocol instance (if any) such as OSPF.
But under a frame relay environment there is an exception for the above rule.
By default maximum bandwidth consumption for EIGRP update will be the half of the (50%) physical interface bandwidth value.
Most of the time Frame relay CIR (Committed Information Rate) will be lower than the physical interface max. bandwidth. (Ex. in a serial interface you will fine 1.544 Mbps physical bandwidth but you may get frame relay 512 Kbps CIR)
So, If the 50% of the bandwidth consumption take from the physical bandwidth, you will be in a big trouble when EIGRP requested the maximum bandwidth (according to the example, it is more than 512 Kbps which is the maximum bandwidth you will get).
In that case you have to use the bandwidth command to change the bandwidth according to you CIR.
Also, you can change the maximum % of the EIGRP updates to save bandwidth in low speed connections.
if multiple DLCIs are in one physical interface the sum of the CIR will be divided by number of DLCIs and then get the 50% bandwidth rate for EIGRP.

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