Here is a silly question that I am amazed I dont have an answer for.
If a router has a 1Gbps LAN connection and all the outbound LAN traffic is heading out the router's serial interface, which is only a T1, how does the router handle the disparity in speeds?
In other words, lets say the router is receiving LAN traffic at a rate of 800 Mbps, and all of it is going out the serial interface, which is only 1.5 Mbps, the router will have to buffer a lot of traffic....right? It may drop a lot of it, correct? Lets imagine no QoS applied, just a vanilla set up.
If i remember correctly , it will store the packets in the hardware as well as software queues till they fill up and then will start tail dropping. The best was to avoid this to place shaping or policing on the Lan interface , ILF on the external interface. there is a lot that can be done to avoid packet loss and maintain some kind of packet qos. but yes , when the queues get filled up then it will cause tail dropping.
Data >> Software queue's (Buffer) >> Hardware queue or Tx ring.
When the data is received in high bandwidth interface and intended go out of slow wan link they are queued in software queue's till the queue is full, then you will experience tail drop in the queue, the packet from queue are then send to Tx ring. Tx ring is the last point from where packet is transmitted on wire. you may tweak the software queueing strategies to meet you requirement. few types of queueing are
Also Shaping strategy can be implemented to meet the output rate of the interface.
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