From: Desimone, Aurelio (ADesimone@refco.com)
Date: Tue Sep 03 2002 - 22:44:38 GMT-3
You are correct on your definitions but you can only run vofr by itself
under a pvc (you cannot carry vofr and data on the same pvc). In order to
enable vofr on a pvc you use 'vofr' under the frame-relay interface-dlci
(adding the 'cisco' keyword uses proprietary vofr encapsulation and
proprietary fragmentation). This is my understanding, anyway. Here are some
good links explaining the differences:
http://www.cisco.com/warp/public/788/voip/vofr_encap_frag_5733.html
http://www.cisco.com/warp/public/788/voip/vofr_encap_frag2_5733.html
http://www.cisco.com/warp/public/788/voip/vofr_encap_frag3_5733.html
Aurelio
-----Original Message-----
From: Volkov, Dmitry (Toronto - BCE) [mailto:dmitry_volkov@ca.ml.com]
Sent: Tuesday, September 03, 2002 1:32 PM
To: 'ccielab@groupstudy.com'
Subject: FR fragmentation and Voice
Can somebody confirm or disprove the following:
definitions:
VoFR - voice packets directly encapsulated into L2 FR frames
VoIP - voice packets are encapsulated into L3 packets
To use FR fragmentation - FRTS has to be enabled.
FR Fragmentation is necessary :
1) PVC is not carrying voice (is not configured as VoFR, but may carry voice
as VoIP), but is sharing the link with other PVCs that are carrying voice
(these other PVCs may carry VoFR or VoIP)
OR
2) when PVC is carrying both voice and data (VoFR and VoIP/data).
================================
option 1) FRF.12 - is the recommended fragmentation to be used by VoIP
configuration: "frame-relay fragment [frag size]" under "map-class
frema-relay [class name]"
=================================
option 2) VoFR - is anabled by "vofr" undef "frame-relay interface-dlci"
command.
fragmentation FRF.11 Annex C is enabled in this case the same way as FRF.12
("frame-relay fragment [frag size]" under "map-class frema-relay [class
name]")
CISCO proprietary fragmentation triggered by adding "cisco" after "vofr" :
"vofr cisco"
under option 2) only VoFR packets are NOT fragmented - all other including
VoIP packets may be fragmented
================================
What is the difference between FRF.11 Annex C and Cisco proprietary (with
exception of word "proprietary") ?
When better to use one and when other ?
Thank You,
Dmitry
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