Cisco Cisco IOS Software Release 12.2(27)SBC
Link Fragmentation and Interleaving for Frame Relay and ATM Virtual Circuits
How to Configure LFI for Frame Relay and ATM PVCs
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Cisco IOS Release: Multiple releases (see the Feature History table)
Benefits of LFI for Frame Relay and ATM Virtual Circuits
End-to-End Voice over IP Quality
This feature enhances Voice over IP (VoIP) QoS by preventing delay, delay variation (jitter), and packet
loss for voice traffic on low-speed ATM-to-ATM and ATM-to-Frame Relay networks.
loss for voice traffic on low-speed ATM-to-ATM and ATM-to-Frame Relay networks.
Interoperability with Other QoS Features
The LFI for Frame Relay and ATM Virtual Circuits feature works concurrently with (and on the same
switching path as) other QoS features, which ensures high quality and scalable VoIP deployment. This
feature works with the following QoS features:
switching path as) other QoS features, which ensures high quality and scalable VoIP deployment. This
feature works with the following QoS features:
•
Frame Relay traffic shaping
•
Low latency queuing
•
Class-based weighted fair queuing (CBWFQ)
Memory Impact of LFI for Frame Relay and ATM Virtual Circuits
This feature does not significantly increase memory requirements except when you have configured
more than 200 ATM PVCs and use a separate virtual template (VT) for each PVC. If you want to use
more than 200 ATM PVCs, you should create only one virtual template to be associated with all
PVCs—this method decreases the memory requirement by about one third for one link per bundle and
by greater than one third when multiple PVCs are bundled.
more than 200 ATM PVCs and use a separate virtual template (VT) for each PVC. If you want to use
more than 200 ATM PVCs, you should create only one virtual template to be associated with all
PVCs—this method decreases the memory requirement by about one third for one link per bundle and
by greater than one third when multiple PVCs are bundled.
Performance Impact of LFI for Frame Relay and ATM Virtual Circuits
This feature does not significantly increase CPU usage. Also, this feature does not affect data forwarding
performance (even with a large number of LFI sessions).
performance (even with a large number of LFI sessions).
How to Configure
LFI for Frame Relay and ATM PVCs
This section describes how to configure the LFI for Frame Relay and ATM Virtual Circuits feature and
consists of the following configuration tasks:
consists of the following configuration tasks:
•
(required)
•
(required)
•
•
(required)
•
(optional)