Cisco Cisco Packet Data Interworking Function (PDIF)
Subscriber Configuration Mode Commands
▀ ip header-compression
▄ Command Line Interface Reference, StarOS Release 17
8748
ip header-compression
Configures the IP packet header compression options for the current subscriber. Although this command configures IP
header compression algorithms, the Internet Protocol Control Protocol (IPCP) negotiations determine when the header
compression algorithm is applied.
header compression algorithms, the Internet Protocol Control Protocol (IPCP) negotiations determine when the header
compression algorithm is applied.
Product
All
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > Subscriber Configuration
configure > context context_name > subscriber { default | name subscriber_name }
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-subscriber)#
Syntax
ip header-compression { rohc [ any [ mode { optimistic | reliable | unidirectional } ] |
cid-mode { { large | small } [ marked-flows-only | max-cid | max-hdr value | mrru value ]
} | marked flows-only | max-hdr value | mrru value | downlink | uplink ] | vj } +
cid-mode { { large | small } [ marked-flows-only | max-cid | max-hdr value | mrru value ]
} | marked flows-only | max-hdr value | mrru value | downlink | uplink ] | vj } +
[ default | no ] ip header-compression
default
Restores this command’s default setting to the Van Jacobsen (VJ) header compression algorithm.
no
Disables all IP header compression.
ip header-compression { rohc [ any [ mode { optimistic | reliable |
unidirectional } ] | cid-mode { { large | small } [ marked-flows-only | max-cid |
max-hdr
unidirectional } ] | cid-mode { { large | small } [ marked-flows-only | max-cid |
max-hdr
value
| mrru
value
] } } | marked flows-only | max-hdr
value
| mrru
value
| downlink | uplink ] | vj }
Specifies that the Robust Header Compression (ROHC) algorithms is used for data.
Important:
ROHC is only supported for use with the PDSN.
any
: Apply ROHC header compression in both the uplink and downlink directions.
mode
{ optimistic | reliable | unidirectional }
:
optimistic
: Sets the ROHC mode to Bidirectional Optimistic mode (O-mode). In this mode packets
are sent in both directions. A feedback channel is used to send error recovery requests and
(optionally) acknowledgments of significant context updates from decompressor to compressor.
Periodic refreshes are not used in the Bidirectional Optimistic mode.
(optionally) acknowledgments of significant context updates from decompressor to compressor.
Periodic refreshes are not used in the Bidirectional Optimistic mode.
reliable
: Sets the ROHC mode to Bidirectional Reliable mode (R-mode). This mode applies an
intensive usage of a feedback channel and a strict logic at both the compressor and the decompressor