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Default CoS

If you do not configure any CoS settings on your routing platform, the software performs some CoS functions to ensure that user traffic and protocol packets are forwarded with minimum delay when the network is experiencing congestion. Some default mappings are automatically applied to each logical interface that you configure. Other default mappings, such as explicit default classifiers and rewrite rules, are in operation only if you explicitly associate them with an interface.

Each CoS component configuration chapter contains a section about default behavior. For more information, see the following sections:

You can display default CoS settings by issuing the show class-of-service operational mode command. This section includes sample output displaying the default CoS settings. The sample output is truncated for brevity.

show class-of-service

user@host> show class-of-service

Default Forwarding Classes

Forwarding class           Queue
  best-effort                           0
  expedited-forwarding                  1
  assured-forwarding                    2
  network-control                       3

Default Code-Point Aliases

Code point type: dscp
  Alias              Bit pattern
  af11               001010
  af12               001100
...
Code point type: dscp-ipv6
...
Code point type: exp
...
Code point type: ieee-802.1
...
Code point type: inet-precedence
...

Default Classifiers

Classifier: dscp-default, Code point type: dscp, Index: 7
...

Classifier: dscp-ipv6-default, Code point type: dscp-ipv6, Index: 8
...

Classifier: exp-default, Code point type: exp, Index: 9
...

Classifier: ieee8021p-default, Code point type: ieee-802.1, Index: 10
...

Classifier: ipprec-default, Code point type: inet-precedence, Index: 11
...

Classifier: ipprec-compatibility, Code point type: inet-precedence, Index: 12
...

Default Frame Relay Loss Priority Map

Loss-priority-map: frame-relay-de-default, Code point type: frame-relay-de, Index: 13
  Code point         Loss priority
  0                  low
  1                  high

Default Rewrite Rules

Rewrite rule: dscp-default, Code point type: dscp, Index: 24
  Forwarding class                    Loss priority       Code point
  best-effort                         low                 000000
  best-effort                         high                000000
...

Rewrite rule: dscp-ipv6-default, Code point type: dscp-ipv6, Index: 25
...

Rewrite rule: exp-default, Code point type: exp, Index: 26
...

Rewrite rule: ieee8021p-default, Code point type: ieee-802.1, Index: 27
...

Rewrite rule: ipprec-default, Code point type: inet-precedence, Index: 28
...

Default Drop Profile

Drop profile: <default-drop-profile>, Type: discrete, Index: 1
  Fill level    Drop probability
         100                 100

Default Schedulers

Scheduler map: <default>, Index: 2

  Scheduler: <default-be>, Forwarding class: best-effort, Index: 17
    Transmit rate: 95 percent, Rate Limit: none, Buffer size: 95 percent, Priority: low
    Drop profiles:
      Loss priority   Protocol    Index    Name
      Low             non-TCP         1    <default-drop-profile>
      Low             TCP             1    <default-drop-profile>
...

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