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

Chapter 10 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:
Note The options {{qinq | dot1q} {aal5 | aal3} {subscriber-encap}} and {user-defined offset [atm]} are
mutually exclusive.

Subscriber Line Encapsulation Types

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:
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Overhead Calculation on the Router

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.
Table 10-1
overhead.
Table 10-1
Encapsulation Type
802.1Q
802.3
AAL5 MUX plus 1483
OL-7433-09
shape rate [account {{qinq | dot1q} {aal5 | aal3} {subscriber-encap}} | {user-defined offset
[atm]}]
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
snap-pppoa
mux-pppoa
snap-rbe
mux-rbe
describes the fields the router uses for the various encapsulation types when calculating ATM
Overhead Calculation
Number of Bytes
18
14
8
Configuration Commands for Overhead Accounting
Description
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
10-5