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Configuring Serial Interfaces on the Cisco ASR 9000 Series Router
Table 22
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
Enable or Disable
Information About Configuring Serial Interfaces
Defaults
1
16
—
Enabled
256
5
40
Enabled
Disable
513