QOS Hold-Queue and Tx-Ring

QOS Hold-Queue and Tx-Ring

Config is to the change the in and out hold queue, also change the Tx-ring-limit



We will change the bandwidth of the serial link on router R2 to 64Kbps
TX-ring Limit to 10 packets, hold queue in 12 and out 10, as we will be only able to generate the desired result in gns3 with this conifg otherwise we have get some live traffic.

R2 Config
interface Serial1/0
 bandwidth 64
 ip address 23.1.1.2 255.255.255.0
 tx-ring-limit 10
 tx-queue-limit 10
 serial restart-delay 0
 clock rate 64000
 hold-queue 12 in
 hold-queue 10 out
end

Now with the config done we will try to ping R4 loopback from R1, there are no drops

Now we try to ping again with high packet size and timeout of 1 we are not seeing any packets drops



Now let us change the hold-queue to 5 out and ping again
R2(config-if)#hold-queue 5 out
 

 
we are able to ping R4 loopback without any problem, now lets change the tx-ring-limit on R2 to 5 and ping again with same packet size
R2(config-if)#tx-ring-limit 5
In the output we can see getting some of the ping drops and see that output queue is filled up sometime, now we are able to fill up the output queue and get see the desired result