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1. Multilink Ppp

Configuring Serial Interfaces on the Cisco ASR 9000 Series Router

Table 22

TCP contexts

Non-TCP contexts

Compression Format Options

Feedback Messages

Maximum Refresh Period Size

Maximum Refresh Time Period

Maximum Header Size

Real Time Protocol (RTP)

Refresh RTP

Currently, only IPv4 unicast packets with UDP in the protocol field of the IP header are compressed.

IPHC is configured on an interface as follows:

•

IPHC profiles must contain the rtp command to enable Real Time Protocol (RTP) on the interface, or

the profile is not enabled. The refresh rtp command must be used to enable the configured refresh

settings for RTP packets. By default, refresh RTP is disabled and only the first packet in the flow is sent

as a 'full-header' packet.

If some attributes, such as feedback messages, maximum refresh period size, maximum refresh time

period, and maximum header size, are not configured in the profile, the default values for those attributes

apply when the profile is enabled on the interface.

Currently, IPHC is supported only on serial interfaces with PPP encapsulation and on multilink with PPP

encapsulation interfaces.

IPHC is typically configured between the Customer Edge (CE) and Provide Edge (PE) ends of an

interface and must be configured at both ends of the interface to work. The PPP protocol negotiates the

IPHC specific parameters between the two ends of the interface and settles on the lowest value

configured between the two ends.

QoS and IPHC

An IPHC profile can be enabled on an interface so that the IPHC profile applies only to packets that

match a Quality of Service (QoS) service policy. In this case, the QoS service-policy class attributes

determine which packets are compressed. This allows users to fine tune IPHC with greater granularity.

Policy maps are attached to an interface using the service-policy command. IPHC action applies only to

output service policies. IPHC is not supported on input service policies.

OL-26061-03

shows the IPHC features, the values of the features, and their defaults:

IPHC features and default setttings

IPHC Feature

Configure the IPHC slot level command

Create an IPHC profile

Configure IPHC attributes in the profile

Attach the profile to an interface

Cisco ASR 9000 Aggregation Services Router Interfaces and Hardware Component Configuration Guide

Values

0 to 255

1 to 6000

IETF or IPHC

Enable or Disable

1 to 65535 packets

0 to 255 seconds

20 to 40 bytes

Enable or Disable

Information About Configuring Serial Interfaces

Defaults

—

Enabled

256

Enabled

Disable

513