Htb
The following scenario shows how to configure a HTB qdisc.
Test HTB QDisc
Description
In this scenario, a Hierarchy Token Bucket (HTB) qdisc is configured in DUT0 (‘eth0’ interface) to achieve linksharing among a hierarchy of classes. Three classes are created with different matches (filters). Each match is allocated to a single class and evaluated in order.
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 traffic control QDISC type htb bandwidth 100 set traffic control QDISC type htb class 1 bandwidth percentage 50 set traffic control QDISC type htb class 1 ceiling percentage 100 set traffic control QDISC type htb class 2 bandwidth percentage 20 set traffic control QDISC type htb class 2 ceiling percentage 0 set traffic control QDISC type htb class 3 bandwidth percentage 10 set traffic control QDISC type htb class 3 ceiling percentage 0 set traffic control QDISC type htb match 1 class 1 set traffic control QDISC type htb match 1 ip destination port 8080 set traffic control QDISC type htb match 2 class 2 set traffic control QDISC type htb match 2 ip protocol tcp set traffic control QDISC type htb default-class 3
Step 2: Set the following configuration in DUT1:
set interfaces ethernet eth0 address 10.0.0.1/24
Step 3: Ping IP address 10.0.0.1 from DUT0:
admin@DUT0$ ping 10.0.0.1 count 1 size 56 timeout 1Show 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=0.860 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.860/0.860/0.860/0.000 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 8080Expect this output in
DUT0:Connecting to host 10.0.0.1, port 8080 [ 5] local 10.0.0.2 port 37222 connected to 10.0.0.1 port 8080 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 14.3 MBytes 120 Mbits/sec 0 328 KBytes [ 5] 1.00-2.00 sec 11.7 MBytes 98.0 Mbits/sec 0 328 KBytes [ 5] 2.00-3.00 sec 11.1 MBytes 92.7 Mbits/sec 0 328 KBytes [ 5] 3.00-4.00 sec 11.6 MBytes 97.6 Mbits/sec 0 328 KBytes [ 5] 4.00-5.00 sec 11.7 MBytes 98.0 Mbits/sec 0 328 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-5.00 sec 60.3 MBytes 101 Mbits/sec 0 sender [ 5] 0.00-5.00 sec 58.5 MBytes 98.0 Mbits/sec receiver iperf Done.
Step 5: Initiate a bandwidth test from DUT0 to DUT1
admin@DUT1$ monitor test performance server port 1234 admin@DUT0$ monitor test performance client 10.0.0.1 duration 5 port 1234Expect this output in
DUT0:Connecting to host 10.0.0.1, port 1234 [ 5] local 10.0.0.2 port 53384 connected to 10.0.0.1 port 1234 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 2.55 MBytes 21.4 Mbits/sec 0 76.4 KBytes [ 5] 1.00-2.00 sec 2.42 MBytes 20.3 Mbits/sec 7 52.3 KBytes [ 5] 2.00-3.00 sec 2.24 MBytes 18.8 Mbits/sec 0 52.3 KBytes [ 5] 3.00-4.00 sec 2.24 MBytes 18.8 Mbits/sec 0 52.3 KBytes [ 5] 4.00-5.00 sec 2.24 MBytes 18.8 Mbits/sec 0 52.3 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-5.00 sec 11.7 MBytes 19.6 Mbits/sec 7 sender [ 5] 0.00-5.00 sec 11.3 MBytes 18.9 Mbits/sec receiver iperf Done.
Step 6: Run command traffic control show at DUT0 and check if output contains the following tokens:
class 1 class 2 class 3 (default)Show output
Traffic control for interface 'eth0' - 'egress' mode ------------------------------------------------------------------------------------ ID traffic control type parent bytes sent pkts sent pkts dropped ------------------------------------------------------------------------------------ 1:0 QDISC htb root 76637245 50666 1 1:1 QDISC class 1 1:0 64239388 42450 0 1:2 QDISC class 2 1:0 12397001 8208 0 1:3 QDISC class 3 (default) 1:0 856 8 0 2:0 - fq_codel 1:1 64239388 42450 0 3:0 - fq_codel 1:2 12397001 8208 1 4:0 - fq_codel 1:3 856 8 0
Attention
The previous command output should include packets for the different
HTB classes. If not, obtaining debugging information may prove usuful.
This can be achieved by setting the following configuration commands:
set traffic control <NAME> type htb match 1 log <PREFIX> or
set traffic policy <NAME> rule 1 log prefix <PREFIX>.
After generating some traffic, the system journal monitor command
can be used to review log messages.