Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

"frags delayed" counter incrementing for Voice PVC

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
Silver

Re: "frags delayed" counter incrementing for Voice PVC

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

166
Views
0
Helpful
1
Replies