[nsp] QoS issues with LLQ, Fair Queue and Frame Relay

Voll, Scott Scott.Voll at wesd.org
Mon Aug 11 10:43:36 EDT 2003

How many calls are you trying to make and what codec?  You are only
prioritizing 64k.  You need to add up how many calls and how much
bandwidth per call and make that your priority **** not just 64.  64
will take care of one G711 call. Or maybe 3 calls at like G729/ G723

You might also look at "frame-relay ip tcp header-compression" or
"frame-relay ip rtp header-compression" to help get you some more

Hope that helps


-----Original Message----- From: Eric Wieling [mailto:eric at fnords.org] 

I'm having trouble with getting QoS working.  I looked at
xample09186a0080094af9.shtml and decided to go withLLQ rather than IP
RTP Priority because we will eventually want to prioritize traffic in
addition to RTP traffic.  What I'm seeing is that the RTP traffic is NOT
being prioritized over other traffic.  I'm also seeing what looks like
random problems with TCP connections (users are complaining about not
being able to connect to our mail server, etc.

We have a Frame Relay network in a hub and spoke configuration.  QoS was
configured at each of the offices.  

I've pasted part of our config in hopes that someone out there can see
what I might be doing wrong.  ANY help or pointers to additional
information would be helpful.

System image file is "flash:c2600-ik9o3s3-mz.122-15.T5.bin"

ip cef

class-map match-all voice-class-map
 match access-group name voice-access-list

policy-map traffic-policy-map
 class voice-class-map
  priority 64
 class class-default

interface Serial0/1
 description Connected to BellSouth
 bandwidth 768
 no ip address
 encapsulation frame-relay
 no fair-queue
 frame-relay traffic-shaping
 frame-relay lmi-type ansi

interface Serial0/1.1 point-to-point
 description morrison
 bandwidth 384
 ip address
 frame-relay interface-dlci 201
  class traffic-map-class

ip access-list extended voice-access-list
 permit udp any any range 16384 37276
 permit udp any eq 5036 any
 permit udp any any eq 5036
 permit udp any eq 5060 any
 permit udp any any eq 5060

map-class frame-relay traffic-map-class
 frame-relay cir 384000
 frame-relay bc 3840
 frame-relay be 0
 frame-relay mincir 384000
 service-policy output traffic-policy-map
 frame-relay fragment 480

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