Unsupported Mlppp Features; Before You Configure Static Mlppp; Configuring Static Mlppp - Juniper JUNOSE SOFTWARE 11.0.X - LINK LAYER CONFIGURATION GUIDE 4-1-2010 Configuration Manual

JUNOSe 11.0.x Link Layer Configuration Guide

Unsupported MLPPP Features

The router does not support the following MLPPP features:

Before You Configure Static MLPPP

Before you begin configuring static MLPPP, you must configure the physical line
interfaces to be aggregated by MLPPP. See the following chapters:
The procedures described in "Configuring Static MLPPP" on page 276 assume that a
physical line interface has been configured.

Configuring Static MLPPP

Static MLPPP configuration consists of two general tasks, each with several subtasks.
276
Unsupported MLPPP Features
Short sequence numbers
Resequencing out-of-order packets in the absence of fragmentation
Given the location in the network where the router resides, the NxT1 links to a
customer site represent one of many places across the IP network where packets
might be received out of order. For example, if the router has multiple uplinks
to a core router, packets might be received out of order across these links.
You can lose packets if you transmit layer 2 traffic on an MPLS LSP that passes
over an MLPPP link bundle.
Packets are passed along to the next protocol layer in the order that they are
processed. Packet resequencing is therefore performed at the end station rather
than the aggregation router. IP datagrams can be resequenced by the end station
using the IP identification field.
Layer 2 packets such as Ethernet/MPLS and ATM-AAL5/MPLS have no sequence
number information and are sent in the order received. The packets are dropped
if their out-of-order condition is detected by a downstream device.
Frame Relay/MPLS packets do have a native sequence number in the header
and are rejected at the end of the LSP if the MLPPP sequence number order is
violated.
To ensure that the router maintains the proper packet order when transmitting
high-priority (non-best-effort) packets such as voice and video, you can use the
ppp hash-link-selection command to enable use of a hash-based algorithm to
select the link on which the router transmits high-priority packets on an MLPPP
interface. For details, see "MLPPP Link Selection" on page 269.
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