Limiting Packet Payload Size on Multilink and Link Services Logical Interfaces
For multilink and link services logical interfaces with MLPPP encapsulation only, you can configure a fragmentation threshold to limit the size of packet payloads transmitted across the individual links within the multilink circuit. The software splits any incoming packet that exceeds the fragmentation threshold into smaller units suitable for the circuit size; it reassembles the fragments at the other end, but does not affect the output traffic stream. The threshold value affects the payload only; it does not affect the MLPPP header. By default, the fragmentation threshold parameter is disabled.
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To configure a fragmentation threshold value, include the fragment-threshold statement:
You can include this statement at the following hierarchy levels:
- [edit interfaces interface-name unit logical-unit-number]
- [edit logical-systems logical-system-name interfaces interface-name unit logical-unit-number]
For link services interfaces, you also can configure a fragmentation threshold value at the physical interface level by including the fragment-threshold statement at the [edit interfaces ls-fpc/pic/port:channel mlfr-uni-nni-bundle-options] hierarchy level:
The maximum fragment size can be from 128 through 16,320 bytes. The Junos OS automatically subdivides packet payloads that exceed this value. Any value you set must be a multiple of 64 bytes (Nx64). The default value, 0, results in no fragmentation.
