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JunosE 11.2.x Link Layer Configuration Guide
Before You Configure Static MLPPP
Configuring Static MLPPP
308
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 301.
Before you begin configuring static MLPPP, you must configure the physical line interfaces
to be aggregated by MLPPP. See the following chapters:
Configuring Channelized T3 Interfaces in JunosE Physical Layer Configuration Guide
Configuring T3 and E3 Interfaces in JunosE Physical Layer Configuration Guide
Configuring Channelized OCx/STMx Interfaces in JunosE Physical Layer Configuration
Guide
The procedures described in "Configuring Static MLPPP" on page 308 assume that a
physical line interface has been configured.
Static MLPPP configuration consists of two general tasks, each with several subtasks.
To configure static MLPPP:
Create the member links to be aggregated into a multilink bundle.
1.
a.
From Global Configuration mode, specify the individual interface on which you
want to configure MLPPP.
Copyright © 2010, Juniper Networks, Inc.
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