Tbf

Contents

The following scenario shows how to configure a Token Bucket Filter qdisc.

Test TBF QDisc

Description

In this scenario, a Token Bucket Filter (TBF) qdisc is configured in DUT0 (‘eth0’ interface) to slow traffic down to a configured rate.

Scenario

Step 1: Set the following configuration in DUT0 :

set interfaces ethernet eth0 address 10.0.0.2/24
set interfaces ethernet eth0 traffic control out QDISC
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'
set traffic control QDISC type tbf bandwidth 100
set traffic control QDISC type tbf burst 105
set traffic control QDISC type tbf latency 1

Step 2: Set the following configuration in DUT1 :

set interfaces ethernet eth0 address 10.0.0.1/24
set system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0'

Step 3: Ping IP address 10.0.0.1 from DUT0:

admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1

Show output

PING 10.0.0.1 (10.0.0.1) 56(84) bytes of data.
64 bytes from 10.0.0.1: icmp_seq=1 ttl=64 time=0.327 ms

--- 10.0.0.1 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.327/0.327/0.327/0.000 ms

Step 4: Initiate a bandwidth test from DUT0 to DUT1

admin@DUT1$ monitor test performance server port 8080
admin@DUT0$ monitor test performance client 10.0.0.1 duration 5 port 8080 parallel 1

Expect this output in DUT0:

Connecting to host 10.0.0.1, port 8080
[  5] local 10.0.0.2 port 53084 connected to 10.0.0.1 port 8080
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec  27.1 MBytes   228 Mbits/sec    0    717 KBytes
[  5]   1.00-2.00   sec  11.2 MBytes  94.4 Mbits/sec    0    717 KBytes
[  5]   2.00-3.00   sec  11.2 MBytes  94.4 Mbits/sec    0    717 KBytes
[  5]   3.00-4.00   sec  11.2 MBytes  94.4 Mbits/sec    0    717 KBytes
[  5]   4.00-5.00   sec  11.2 MBytes  94.4 Mbits/sec    1    857 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-5.00   sec  72.1 MBytes   121 Mbits/sec    1             sender
[  5]   0.00-5.05   sec  69.5 MBytes   116 Mbits/sec                  receiver

iperf Done.

Step 5: Run command traffic control show at DUT0 and check if output contains the following tokens:

tbf

Show output

Traffic control for interface 'eth0' - 'egress' mode

-----------------------------------------------------------------------
ID   traffic control  type  parent  bytes sent  pkts sent  pkts dropped
-----------------------------------------------------------------------
1:0  QDISC            tbf   root      76385540      50480             0

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