For doing QoS over a low speed link where voice and data co-exists, I have configured Link fragmentation and interleaving to fragment the jumbograms to improve link efficiency. QoS does work with LLQ configured for Voice, but I have problems in data transfers. The MS Exchange server is not able to comunicate with the remote end servers with LFI enabled on the link.
Make sure you're doing actual LFI as in link fragmentation, rather than IP-level fragmentation. If you're using the 'ip mtu' or 'mtu' commands to force a smaller IP packet MTU, this can sometimes cause communications problems. You should be using either 'ppp multilink fragment' or frame-relay fragmentation, depending on your media type.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
IOS XR configuration principles relevant for this article are:
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