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 system login user admin authentication encrypted-password '$6$GSjsCj8gHLv$/VcqU6FLi6CT2Oxn0MJQ2C2tqnRDrYKNF8HIYWJp68nvXvPdFccDsT04.WtigUONbKYrgKg8d6rEs8PjljMkH0' 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 default-class 3 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
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 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=0.575 ms --- 10.0.0.1 ping statistics --- 1 packets transmitted, 1 received, 0% packet loss, time 0ms rtt min/avg/max/mdev = 0.575/0.575/0.575/0.000 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 43358 connected to 10.0.0.1 port 8080 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 14.2 MBytes 119 Mbits/sec 106 83.4 KBytes [ 5] 1.00-2.00 sec 11.2 MBytes 93.8 Mbits/sec 0 83.4 KBytes [ 5] 2.00-3.00 sec 11.7 MBytes 98.5 Mbits/sec 0 83.4 KBytes [ 5] 3.00-4.00 sec 11.2 MBytes 93.8 Mbits/sec 0 83.4 KBytes [ 5] 4.00-5.00 sec 11.2 MBytes 93.8 Mbits/sec 0 83.4 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-5.00 sec 59.5 MBytes 99.8 Mbits/sec 106 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 43630 connected to 10.0.0.1 port 1234 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 2.74 MBytes 23.0 Mbits/sec 29 31.1 KBytes [ 5] 1.00-2.00 sec 2.24 MBytes 18.8 Mbits/sec 39 18.4 KBytes [ 5] 2.00-3.00 sec 2.49 MBytes 20.9 Mbits/sec 28 22.6 KBytes [ 5] 3.00-4.00 sec 2.24 MBytes 18.8 Mbits/sec 24 41.0 KBytes [ 5] 4.00-5.00 sec 2.24 MBytes 18.8 Mbits/sec 43 28.3 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-5.00 sec 11.9 MBytes 20.0 Mbits/sec 163 sender [ 5] 0.00-5.00 sec 11.4 MBytes 19.1 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 76708068 50708 31 1:1 QDISC class 1 1:0 64172637 42404 0 1:2 QDISC class 2 1:0 12534575 8296 0 1:3 QDISC class 3 (default) 1:0 856 8 0 2:0 - fq_codel 1:1 64172637 42404 4 3:0 - fq_codel 1:2 12534575 8296 27 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.