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Predefined user roles
network-admin
Parameters
nonstandard: Specifies the nonstandard encapsulation type. Specify this keyword when the device
is interoperating with third-party devices. This keyword supports RTP header compression (but not
TCP header compression).
Usage guidelines
IPHC includes the following types:
• RTP header compression—Compresses the IP/UDP/RTP header in packets.
• TCP header compression—Compresses the TCP/IP header in packets.
Enabling/disabling IPHC enables/disables both RTP header compression and TCP header
compression.
To make IPHC take effect on a link, you must enable Frame Relay IPHC on both ends of the link.
You can configure Frame Relay IPHC on either an interface or VC. The setting on an interface takes
effect on all VCs of the interface. The setting on a VC takes effect only on the VC. When the interface
setting is different from the VC setting, the VC setting takes effect.
When the encapsulation type is IETF, IPHC negotiation is triggered after you enable IPHC. IPHC
takes effect only if IPHC negotiation succeeds.
When the encapsulation type is nonstandard, IPHC takes effect without negotiation. In this case, the
encapsulation type must be nonstandard on both ends of the link.
Compression does not stop after you disable IPHC. To stop compression on an interface or PVC,
you must also execute the shutdown/undo shutdown command sequence on t he interface or
PVC.
Examples
# Enable Frame Relay IPHC on interface Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] fr compression iphc enable
# Enable Frame Relay IPHC on the VC with DLCI 100 on interface Serial 2/1/0.
<Sysname> system-view
[Sysname] interface serial 2/1/0
[Sysname-Serial2/1/0] fr dlci 100
[Sysname-fr-dlci-Serial2/1/0-100] fr compression iphc enable
Related commands
fr encapsulation
fr compression iphc rtp-connections
Use fr compression iphc rtp-connections to set the maximum number of RTP
header-compression connections allowed on a Frame Relay interface or VC.
Use undo fr compression iphc rtp-connections to restore the default.
Syntax
fr compression iphc rtp-connections number
undo fr compression iphc rtp-connections
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