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

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When reassembly is enabled, member links belonging to the same bundle can
have different local MRU values.
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When reassembly is disabled, member links belonging to the same bundle must
negotiate the same local MRU value.
Bundle Validation Failure
If an MLPPP link interface fails bundle validation because one or more of the preceding
configuration guidelines are not met, the router’s actions differ depending on whether
you are using a static MLPPP configuration or a dynamic MLPPP configuration, as
follows:
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For static MLPPP configurations, the router permits the failed link to join the
bundle, but forces the link into a down state.
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For dynamic MLPPP configurations, the router prohibits the failed link from
joining the bundle, and subsequently tears down the link.
Recovering from Bundle Validation Failure
To recover from a bundle validation failure, you must reconfigure the link interface
(for static MLPPP configurations) or reconfigure the profile (for dynamic MLPPP
configurations) according to the guidelines described in “Bundle Validation and
Configuration Guidelines” on page 326.
Configuring Fragmentation and Reassembly for Static MLPPP
To configure fragmentation and reassembly on a static MLPPP link interface:
1.
From Global Configuration mode, specify the individual link interface on which
you want to configure fragmentation and reassembly.
host1(config)# interface serial 4/0:1/1/1/1/1
2.
Specify MLPPP as the encapsulation method on the link interface.
host1(config-if)# encapsulation mlppp
3.
Enable fragmentation on the link interface, and optionally specify the maximum
allowable fragment size to use.
host1(config-if)# ppp fragmentation 128
NOTE: You can specify the maximum fragment size for a link only when you use
the ppp fragmentation command to enable fragmentation on that link. You cannot
specify the maximum fragment size for a link when fragmentation is disabled.
4.
Enable reassembly on the link interface, and optionally specify the administrative
MRRU value to use.
host1(config-if)# ppp reassembly 1590
Configuring MLPPP Fragmentation and Reassembly
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Chapter 9: Configuring Multilink PPP