R3303-HP HSR6800 Routers Layer 2 - WAN Configuration Guide

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To negotiate the use of short sequence numbers on a dialer MP bundle, configure the command on the
dialer interfaces and the ISDN D channels; to do that on a common MP bundle, use the command on all
its channels. Note that the command will cause PPP re-negotiation.
To configure short sequence number header format negotiation for MP:
Ste
p
Command Remarks
1. Enter system view
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Trigger MP short sequence number
header format negotiation, specifying
that the interface receive fragments
with short sequence numbers after the
negotiation succeeds.
ppp mp short-sequence
By default, long sequence
number header format
negotiation is performed.
Configuring the MP endpoint descriptor
The MP endpoint descriptor is negotiated during LCP negotiation for MP bundling.
By default, the endpoint descriptor of an interface is the device name. If the interface is assigned to an
MP group by using the ppp mp mp-group command, the endpoint descriptor of the interface is the MP
group interface name. If the endpoint descriptor exceeds 20 bytes, only the first 20 bytes are taken.
You can also configure the endpoint descriptor by performing the following task.
To configure the MP endpoint descriptor of an interface for LCP negotiation:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Configure the MP endpoint
descriptor.
ppp mp endpoint string char-string Optional.
Configuring PPP link efficiency mechanisms
Four mechanisms are available for improving transmission efficiency on PPP links:
• IP Header Compression (IPHC)
• Link Fragmentation and Interleaving (LFI).
Configuring IP header compression
IP header compression (IPHC) is a host-to-host protocol used to carry real-time multimedia services such
as voice and video over IP networks. To decrease the bandwidth consumed by packet headers, you can
enable IPHC on PPP links to compress RTP (including IP, UDP, and RTP) headers or TCP headers. The
following uses RTP header compression to describe how compression operates.