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"frags delayed" counter incrementing for Voice PVC

mnlatif
Level 3
Level 3

Hi,

We are using VoFR between two Cisco 2610 using FXO\FXS Cards. It is a point-point link with two PVCs, one for Voice and one for Data.

I have implemented Traffic-Shaping and FRF. However when i do a "show frame pvc " command, i can see "frags delayed"counter incrementing for the Voice PVC, indiciating delay in sending packets and thus compromising Voice Quality.

1. Is it normal to have this counter increasing ? What is the acceptable percentage i.e "frags delayed \ total frags" ?

2. Is there anything i can do ? Would PVC Priority Queuing help ?

I need to be sure if PVC Priority is the solution, as we would have to do a Flash Upgrade to install the new software with this feature.

++++++++++++++++++++++++++

show frame pvc 103

PVC Statistics for interface Serial0/0 (Frame Relay DTE)

DLCI = 103, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial0/0.3

input pkts 373951 output pkts 374604 in bytes 11542352

out bytes 12245392 dropped pkts 0 in FECN pkts 0

in BECN pkts 0 out FECN pkts 0 out BECN pkts 0

in DE pkts 0 out DE pkts 0

out bcast pkts 5474 out bcast bytes 1571038

pvc create time 11w3d, last time pvc status changed 04:06:31

Service type VoFR-cisco

Voice Queueing Stats: 0/100/0 (size/max/dropped)

Current fair queue configuration:

Discard Dynamic Reserved

threshold queue count queue count

64 16 2

Output queue size 0/max total 600/drops 0

configured voice bandwidth 30000, used voice bandwidth 0

fragment type VoFR-cisco fragment size 320

cir 32000 bc 320 be 0 limit 40 interval 10

mincir 32000 byte increment 40 BECN response no

frags 374604 bytes 12261814 frags delayed 6501 bytes delayed 1609296

shaping inactive

traffic shaping drops 0

+++++++++++++++++++++++++++++++++++

1 Reply 1

thomas.chen
Level 6
Level 6

The following links explains the delay in voice traffic and gow to do traffic policing

VoIP over Frame Relay with QoS (Fragmentation, Traffic Shaping, LLQ / IP RTP Priority)

http://www.cisco.com/warp/public/788/voice-qos/voip-ov-fr-qos.html#15

Troubleshooting Output Drops with Priority Queueing

http://www.cisco.com/warp/public/105/priorityqueuedrops.html

Understanding Delay in Packet Voice Networks

http://www.cisco.com/warp/public/788/voip/delay-details.html

Voice QoS: ToS-CoS Mapping Via LLQ

http://www.cisco.com/warp/public/788/voice-qos/tos-cos.html

Frame Relay Traffic Shaping for VoIP and VoFR

http://www.cisco.com/warp/public/788/voip/fr_traffic.html

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