Overhead Accounting And Hierarchical Policies - Cisco 10000 Series Configuration Manual

Overhead Accounting and Hierarchical Policies

Table 10-1
Encapsulation Type
AAL5 MUX plus PPPoA
AAL5 SNAP plus 1483
AAL5 SNAP plus PPPoA
PPPoE
qinq
Overhead Accounting and Hierarchical Policies
In hierarchical policies, you can enable overhead accounting for shaping and bandwidth on top-level
parent policies, middle-level child policies, and bottom-level child policies. If you enable overhead
accounting on a:
•
•
The parent and child classes must specify the same encapsulation type when enabling overhead
accounting and configuring an offset using the user-defined offset [atm] command option.
Table 10-2
overhead accounting is currently enabled for a parent policy, then accounting can be disabled or enabled
on a child policy.
Table 10-2
Policy Map or Class
Parent
Child
Child class
Child class (nonpriority
without policing)
Child class (priority with
policing)
Cisco 10000 Series Router Quality of Service Configuration Guide
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Overhead Calculation (continued)
Number of Bytes
10
18
12
6
22
Parent class-default class, you are not required to enable accounting on a child traffic class that does
not contain the bandwidth or shape command.
Child policy, then you must enable overhead accounting on the parent policy.
summarizes the configuration requirements for overhead accounting. For example, if
Overhead Accounting Configuration Requirements
Description
8-byte AAL5 trailer + 2-byte protocol ID (0x0021)
8-byte AAL5 trailer + 3-byte LLC header
(0xAAAA03) + 3-byte OUI (0x0080c2) + 2-byte
protocol ID (0x0007) + 2-byte PAD (0x0000)
8-byte AAL5 trailer + 3-byte LLC header (0xFEFE03)
+ 1-byte protocol ID (0xCF)
1-byte version/type (0x11) + 1-byte code (0x00) +
2-byte session ID + 2-byte length
6-byte destination MAC address + 6-byte source MAC
address + 2-byte protocol ID (0x8100) + 2-byte
VID/CFI/PRIORITY + 2-byte protocol ID + 2-byte
inner tag + 2-byte length or type
Current Configuration Configuration Requirement
Enabled Enabled on child policy
Enabled Enabled on parent policy
Enabled Enabled on all classes in the child policy map,
except priority classes with policing
Disabled Disabled on all classes in the child policy map
Disabled Disabled or enabled on all nonpriority classes
in the child policy map
Chapter 10 Overhead Accounting
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