Configuration Commands For Overhead Accounting; Subscriber Line Encapsulation Types; Overhead Calculation On The Router - Cisco 10000 Series Configuration Manual

Quality of service configuration guide

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Overhead Accounting

Configuration Commands for Overhead Accounting

To enable overhead accounting, use the shape and bandwidth commands. These commands allow you

to specify the encapsulation type and user-defined offset that the router uses in calculating overhead. The

commands have the following syntax:

The options {{qinq | dot1q} {aal5 | aal3} {subscriber-encap}} and {user-defined offset [atm]} are

mutually exclusive.

The subscriber-encap option of the shape and bandwidth commands specifies the encapsulation type

at the subscriber line. The router supports the following subscriber line encapsulation types:

When calculating overhead for traffic shaping, the router considers the encapsulation type used between

the BRAS and the DSLAM, and between the DSLAM and CPE.

Encapsulation Type

AAL5 MUX plus 1483

shape rate [account {{qinq | dot1q} {aal5 | aal3} {subscriber-encap}} | {user-defined offset

bandwidth {bandwidth-kbps | percent percentage | remaining percent percentage} {{qinq |

dot1q} {aal5 | aal3} {subscriber-encap}} | {user-defined offset [atm]}]

snap-1483routed

mux-1483routed

snap-dot1q-rbe

mux-dot1q-rbe

describes the fields the router uses for the various encapsulation types when calculating ATM

Overhead Calculation

Number of Bytes

Configuration Commands for Overhead Accounting

6-byte destination MAC address + 6-byte source MAC

address + 2-byte protocol ID (0x8100) + 2-byte

VID/CFI/PRIORITY + 2-byte length/type

6-byte destination MAC address + 6-byte source MAC

address + 2-byte protocol ID (0x8000)

8-byte AAL5 trailer

Cisco 10000 Series Router Quality of Service Configuration Guide

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