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

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Do not configure both MLPPP fragmentation and IP fragmentation of L2TP
packets (with the
ip mtu command) on the same interface. Instead, you must
choose only one of the fragmentation configurations by setting it to the necessary
value and set the other fragmentation configuration to the maximum allowable
value.
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Example
host1(config-if)# ppp fragmentation 128
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Use the no version to disable fragmentation on the link and restore the default
fragment size, which is the link’s MTU.
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See ppp fragmentation.
ppp multilink enable
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Use in a profile to enable the creation of dynamic MLPPP interfaces.
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Example
host1(config-profile)# ppp multilink enable
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Use the no version to reject any incoming requests to create dynamic MLPPP
interfaces.
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See ppp multilink enable.
ppp reassembly
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Use to enable reassembly on an MLPPP link interface.
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If reassembly is enabled on the link, you can optionally specify the administrative
MRRU for the link, in the range 64–65535 octets. The administrative MRRU is
the maximum allowable size of the PPP packet payload that the router can
receive.
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A link’s MRRU must be greater than or equal to the local MRU on that link.
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We recommend that all member links in an MLPPP bundle be assigned the same
reassembly setting: enabled or disabled.
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Example
host1(config-if)# ppp reassembly 1590
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Use the no version to disable reassembly on the link and restore the default
value, which is the local MRU on the link.
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See ppp reassembly.
profile
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Use to create a profile for a dynamic interface.
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You specify a profile name of up to 80 characters.
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Example
host1(config)# profile dynmlppp1
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Configuring MLPPP Fragmentation and Reassembly
JUNOSe 11.1.x Link Layer Configuration Guide