Download capacity and output drops

[tedauction]

Hello, take for instance you have a 100Mbps synchronous WAN circuit.

Someone is downloading a large file from the WAN to the LAN (ingress traffic) which is soaking up all of that 100Mbps bandwidth.

Without any QoS, will this result in output drops on the interface if you send data from LAN to WAN  ?

So I am essentially asking if ingress traffic max'es out the bandwidth, does this prevent egress traffic from passing (resulting in output drops).

[Leo Laohoo · Accepted solution]

Without any QoS, will this result in output drops on the interface if you send data from LAN to WAN  

No.  Total Output Drops only appear when there is a "congestion" to data packets going OUT of the interface.  Downloading is pulling packets IN from the WAN interface. 

Another thing, the upstream provider of the WAN link will have a traffic-shaping policy on their port (facing you).  So even they won't see output drops.

[Reza Sharifi · Accepted solution]

Hi,

If the circuit is configured as full duplex, than that means 100Mb in each direction. (100 upload and 100 download). So, the download should not effect the upload (lan to wan). You also have to make sure that the device itself has the capacity to handle the bandwidth.

HTH

[Leo Laohoo]

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