If I have 10 locations having a single T1 which are PVC's and two locations which are DS3's PVC and at 10Mb. By using Adaptive Frame Relay Traffic Shapping, would I be able to, when congestion is high between the two sites with the 10Mb link, reallocate some bandwidth from the other sites to increase the capacity to over 10 MB?
Its been very long time, I have had almost similar type of question on my previous exam but in different way.
The Frame-relay Adaptive shaping command allows DTEs to respond to BECN and FECN messages sets at the frame-relay header. When the link is congested and becn bit set, the speed is decreased to the CIR value configured, therefore, it would allow dor dynamic bandwidth relocation between sites.
If you have asymetrical bandwidths, if supported, suggest you shape larger to conform with slower link's capacity. E.g. on DS3 or 10 Mbps, shape outbound PVC to T1, it that's what's on the other side of PVC.
As to using BECNs, you first need, I believe, to echo the FECNs, and then you can dynamically "safely" use bandwidth between CIR and link capacity.
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This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
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