Juniper JUNOSE 11.1.X - LINK LAYER CONFIGURATION 4-7-2010 Configuration Manual page 341

For information about multiclass MLPPP, see "Configuring Multiclass Multilink
PPP" on page 349.
You can configure bundles as follows:
On a COCX-F3 line module and its corresponding I/O modules, you can configure:
Up to 8 member links from different ports in the same bundle, with the
following restriction for MLPPP reassembly:
For a COCX-F3 line module with either a 12-port E3-12 FRAME I/O
module or a 12-port CT3/T3 12 I/O module, the restriction is based on
the ports on which member links in the same bundle are configured.
A 12-port E3-12 FRAME I/O module and a 12-port CT3/T3 12 I/O module
each contain 12 ports numbered 0 through 11. When MLPPP reassembly
is enabled, you can configure a bundle with member links on the same
port; on ports 0, 1, and 2; on ports 3, 4, and 5; on ports 6, 7, and 8; or
on ports 9, 10, and 11. However, the router cannot properly reassemble
fragments if you configure a bundle with member links that span ports
in different bundles; for example, on ports 0, 1, and 4.
When MLPPP reassembly is disabled, this restriction is not in effect; that
is, member links can span ports in different bundles.
Up to 12 bundles
On a cOCx/STMx line module and its corresponding I/O module, you can
configure:
Member links from different OC3/STM1 ports in the same bundle, with the
following restrictions for MLPPP reassembly:
For a cOCx/STMx line module with a 4-port cOC3/STM1 I/O module, the
restriction is based on the ports on which member links in the same
bundle are configured.
A 4-port cOC3/STM1 I/O module contains four ports numbered 0 through
3. When MLPPP reassembly is enabled, you can configure a bundle with
member links on the same port, on ports 0 and 1, or on ports 2 and 3.
However, the router cannot properly reassemble fragments if you
configure a bundle with member links that span ports in different
bundles; for example, on ports 1 and 2.
When MLPPP reassembly is disabled, this restriction is not in effect; that
is, member links can span ports in different bundles.
For a cOCx/STMx line module with a 1-port cOC12/STM4 I/O module,
the restriction is based on the STM1 (OC3) paths on which member links
in the same bundle are configured.
A 1-port cOC12/STM4 I/O module has four logical paths numbered 1
through 4. When MLPPP reassembly is enabled, you can configure a
bundle with member links on the same path, on paths 1 and 2, or on
paths 3 and 4. However, the router cannot properly reassemble fragments
if you configure a bundle with member links that span paths in different
bundles; that is, on paths 2 and 3.
Chapter 9: Configuring Multilink PPP
Supported MLPPP Features
309