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Configuring MRRU on Multilink and Link Services Logical Interfaces

The maximum received reconstructed unit (MRRU) is similar to a maximum transmission

unit (MTU), but applies only to multilink bundles; it is the maximum packet size that the

multilink interface can process. By default, the MRRU is set to 1500 bytes; you can

configure a different MRRU value if the peer equipment allows this. The MRRU accounts

for the original payload, for example the Layer 3 protocol payload, but does not include

the 2-byte PPP header or the additional MLPPP or MLFR header applied while the

individual multilink packets are traversing separate links in the bundle.

NOTE: Only MLPPP is supported on ACX Series routers. MLFR is not supported

on ACX Series routers.

To configure a different MRRU value, include the mrru statement:

mrru bytes;

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]

NOTE: ACX Series routers do not support logical systems.

For link services interfaces, you also can configure a different MRRU at the physical

interface level by including the mrru statement at the [edit interfaces

ls-fpc/pic/port:channel mlfr-uni-nni-bundle-options] hierarchy level:

mrru bytes;

The MRRU size can range from 1500 through 4500 bytes.

NOTE: If you set the MRRU on a bundle to a value larger than the MTU of the

individual links within it, you must enable a fragmentation threshold for that

bundle. Set the threshold to a value no larger than the smallest MTU of any

link included in the bundle.

Determine the appropriate MTU size for the bundle by ensuring that the MTU

size does not exceed the sum of the encapsulation overhead and the MTU

sizes for the links in the bundle.

You can configure separate family mtu values on the following protocol families under

bundle interfaces: inet, inet6, iso, and mpls. If not configured, the default value of 1500

is used on all except for mpls configurations, in which the value 1488 is used.

ACX Series Universal Access Router Configuration Guide

Juniper ACX2000 Configuration Guide

Other manuals for Juniper ACX2000