Application of various functions of Linux traffic control TC Tool

The internal network of an enterprise has enough bandwidth to use. However, the Internet access for enterprises is generally limited. To improve the quality of use of the network and ensure that users use the bandwidth of the entire network according to the business design requirements in the network, you can analyze and optimize the Linux system from the perspective of the traffic control server, it brings convenience and efficiency to Enterprise Services. Now we will introduce the specific use of the traffic control TC. The first is the total usage of TC.

TC command. The kernel supports setting QoS support, QoS and/or fair queueing = y. Usage:
# Tc [OPTIONS] OBJECT {COMMAND | help}

Where
OBJECT :={ qdisc | class | filter}
OPTIONS: = {-s [tatistics] |-d [etails] |-r [aw]}

The following describes the usage of queues, categories, and filters in TC.
1. Queue qdisc in TC) Usage
In queue use, the kernel supports setting QoS support, QoS and/or fair queueing = y. Usage:
 

 
 

  
  
#tc qdisc [ add | del | replace | change | get ] dev STRING  
  
  
[ handle QHANDLE ] [ root | ingress | parent CLASSID ]  
  
  
[ estimator INTERVAL TIME_CONSTANT ]  
  
  
[ [ QDISC_KIND ] [ help | OPTIONS ] ]  
  
  
#tc qdisc show [ dev STRING ] [ingress]  
 
 

Where
 

 
 

  
  
QDISC_KIND: = {[p | B] fifo | tbf | prio | cbq | red | etc .}
  
  
OPTIONS: =... try tc qdisc add <desired QDISC_KIND> help
  
  
In the CBQ queue qdisc cbq), QoS support, QoS and/or fair queueing, CBQ packet scheding, and Rate estimator = y must be set in the kernel. Usage:
  
  
... Cbq bandwidth BPS avpkt BYTES [mpu BYTES]
  
  
[Cell BYTES] [ewma LOG]
 
 

2. Classification class in TC) Usage
For classification, the kernel supports setting QoS support, QoS and/or fair queueing, and Packet classifier API = y. Usage:
 

 
 

  
  
#tc class [ add | del | change | get ] dev STRING  
  
  
[ classid CLASSID ] [ root | parent CLASSID ]  
  
  
[ [ QDISC_KIND ] [ help | OPTIONS ] ]  
  
  
#tc class show [ dev STRING ] [ root | parent CLASSID ] 
 
 

Where
 

 
 

  
  
QDISC_KIND: = {prio | cbq | etc .}
  
  
OPTIONS: =... try tc class add <desired QDISC_KIND> help
  
  
& Nbsp; tc cbq class cbq) usage:
  
  
<Ccid_nobr>
  
  
<Table width = "400" border = "1" cellspacing = "0" cellpadding = "2"
  
  
Bordercolorlight = "black" bordercolordark = "# FFFFFF" align = "center">
  
  
<Tr>
  
  
<Td bgcolor = "e6e6e6" class = "code" style = "font-size: 9pt">
  
  
<Pre> <ccid_code>... cbq bandwidth BPS rate BPS maxburst PKTS [avpkt BYTES]
  
  
[Minburst PKTS] [bounded] [isolated]
  
  
[Allot BYTES] [mpu BYTES] [weight RATE]
  
  
[Prio NUMBER] [cell BYTES] [ewma LOG]
  
  
[Estimator INTERVAL TIME_CONSTANT]
  
  
[Split CLASSID] [defmap MASK/CHANGE]
 
 

3. Usage of filters in TC)
When using the filter, the kernel supports setting QoS support, QoS and/or fair queueing, and Packet classifier API = y. Usage:
 

 
 

  
  
#tc filter [ add | del | change | get ] dev STRING  
  
  
[ pref PRIO ] [ protocol PROTO ]  
  
  
[ estimator INTERVAL TIME_CONSTANT ]  
  
  
[ root | classid CLASSID ] [ handle FILTERID ]  
  
  
[ [ FILTER_TYPE ] [ help | OPTIONS ] ]  
  
  
#tc filter show [ dev STRING ] [ root | parent CLASSID ]  
 
 

Where
 

 
 

  
  
FILTER_TYPE := { rsvp | u32 | fw | route | etc. }  
  
  
FILTERID := ... format depends on classifier, see there  
  
  
OPTIONS := ... try tc filter add <desired FILTER_KIND> help  
 
 

Usage of TC U32 filter u32:
 

 
 

  
  
... U32 [match SELECTOR...] [link HTID] [classid CLASSID]
  
  
[Police export e_spec] [offset OFFSET_SPEC]
  
  
[Ht HTID] [hashkey HASHKEY_SPEC]
  
  
[Sample]
  
  
Or u32 divisor
 
 

Where
 

 
 

  
  
SELECTOR := SAMPLE SAMPLE ...  
  
  
SAMPLE := { ip | ip6 | udp | tcp | icmp | u{32|16|8} } SAMPLE_ARGS  
  
  
FILTERID := X:Y:Z  
 
 

Usage of tc fw filter fw:
... Fw [classid CLASSID] [police paie_spec]

Where
Export e_spec: =... look at TBF
CLASSID: = X: Y