Configuring Frame Relay Fragmentation; Example Frame Relay Qos Configuration - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

Setting Up Quality of Service
Configuring Rate Limiting for Frame Relay
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The sum of the committed and excessive burst values is the upper limit for
bandwidth available on the interface, which should always exceed 8000 bps.
You can dedicate up to 75 percent of the available bandwidth to low-latency
queues and CBWFQ classes.

Configuring Frame Relay Fragmentation

You must first configure rate limiting as described above to structure how the
router bursts traffic. You can then enable Frame Relay fragmentation and set
the size for fragments.
You set the FRF.12 fragment size for individual Frame Relay subinterfaces.
Move to the configuration mode context for the subinterface and enter:
Syntax: frame-relay fragment <threshold>
For example:
ProCurve(config-fr 1.101)# frame-relay fragment 100
The threshold is the fragment size in bytes. Valid fragment sizes are between
64 and 1600 bytes. Because fragmentation is not implemented by default, there
is no default fragment size.
Data frames can be fragmented and reconstructed without harming their
integrity. They are not delay sensitive, and it does not matter if some of the
data arrives slightly after the rest. VoIP frames, on the other hand, cannot be
fragmented. Frames must arrive in order and in a continuous stream. With
FRF.12 fragmentation, the router only fragments frames that exceed the
threshold size. You should take care to set this threshold greater than the size
of VoIP frames so that the router does not fragment them.
Almost all devices now use a maximum transmission unit (MTU) size of 1500
bytes. However, if any device to which the router will be forwarding traffic
has a smaller MTU, the fragment threshold must be set at or below this MTU.

Example Frame Relay QoS Configuration

Your organization has a PVC carried on two E1 lines that together provide
4.096 Mbps to a remote site. This PVC carries both data and voice.
The PVC's CIR is 1.5 Mbps. Your Frame Relay provider allows you to burst an
unlimited amount traffic. However, the E1 lines carry several PVCs. This PVC
connects to a site that only has a 2.048 Mbps Frame Relay connection. You do
not want the router to transmit packets only to have them dropped on the