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Chapter 11

Multilink PPP Support for the Cisco ASR 1000 Series Routers

shape [average | peak] mean-rate [burst-size] [excess-burst-size] account {{{qinq | dot1q} {aal5 |

aal3} {subscriber-encapsulation}} | {user-defined offset [atm]}}

This command enables you to include the additional overhead added by a SPA using the user-defined

option. For example, the Ethernet SPA adds an additional 24 bytes per packet so that a user-defined value

of 24 covers Ethernet IPG (12) + Preamble (8) + CRC32 (4). Another interesting scenario is when

deploying MLPoLNS in an ATM topology. The physical link between the LNS and the LAC is Ethernet,

and the physical link between the LAC and the CPE is ATM. In such a scenario, you can add the atm

keyword to include the ATM Cell overhead between the LAC and the CPE.

In Cisco IOS XE Release 3.6S, shaping and policing overhead accounting support was added for Serial

Multilink PPP and Multilink PPP LFI.

For more information on shaping and policing, see the IOS XE Ethernet Overhead Accounting

documentation at:

http://www.cisco.com/en/US/docs/ios-xml/ios/qos_plcshp/configuration/xe-3s/qos-plcshp-ether-ohead

-actg.html

Downstream Model-F Shaper on LNS

From Cisco IOS XE Release 3.7.1S, Model-F downstream shaping support for MLPoLNS is available

to the Cisco ASR 1000 Series Aggregation Services Routers when these routers function as an LNS

device.

Model-F downstream shaping for MLPoLNS is not supported on the Cisco ASR 1002-X Router and the

Note

FP100 line card.

This section provides an example of a Model-F policy with a parent shaper policy attached to a VLAN

interface on the LNS device. The VLAN interface is used for the L2TP tunnel between the LAC device

and the LNS device. The following configuration example shows an aggregate shaper applied to a

VLAN, which shapes all the MLP sessions going downstream to the LAC device:

policy-map lns_downstream_shaper_out

interface GigabitEthernet0/1/0.2

Note

Model-F QoS allows a parent shaper on the class-default class by using a flat policy. No additional QoS

functionalities are supported in the Model-F policy.

OL-16506-17

class class-default

shape average 5000000

encapsulation dot1Q 2

ip address 90.0.0.1 255.255.255.0

service-policy output lns_downstream_shaper_out

Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide

Information About Multilink PPP Support for Cisco ASR 1000 Series Routers

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