Hi, I use Queuing, : - RTP audio : DSCP ef, Queuing LLQ 30% When I monitor the QOS with SDM, I see the RTP Audio Packet, but when I put a big file on a FTP server (in Best effort), my phone communication are Bad, and I don't think that QOS works ... My conf : class-map match-any voice policy-map SDM-QoS-Policy-1 Dialer0 : service-policy output SDM-QoS-Policy-1 Is it the right way to configure QOS ? |
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UC500.comCisco Communication Manager Express, UC520, SMB VOIP reference and community |
Good point. This can also be
Good point. This can also be an issue if the 500 is not the only router on that internet connection with the FTP server being external. For example: In our offices, we currently have three 520's connected and running to one broadband connection, they all have seperate static IP's, however they all share the same 5/1 line. (As well as a couple ASA's) Unless I am limiting the external bandwidth each 500/ASA is using, I can do QoS internally until the Earth stops spinning, but it's not going to make a difference if my external source is my issue.
Is the FTP server internally
Is the FTP server internally on your network or an extenal source?
I think you have a good start
I think you have a good start but TRAFFIC SHAPING is important and I beleive is missing here. You have to tell the router how big your internet pipe is, and then how to send priority traffic over it and how to reserve space for priority traffic. I have read some VoIP docs that state many times TRAFFIC SHAPING is the important part for sending voice data over a slow link. Maybe this doc will help a little? Please dont take me as an expert in this area but maybe it will help you....
Cisco VoIP doc
Just one slight problem,
Just one slight problem, which I hit a while back, is that you can't implement queuing on a virtual interface (which dialer is). It accepts the command but it doesn't actually do anything!!
You can check it with
"sh policy-map int dialer1"
What I generally do, and what I find works quite well if using ADSL over a dialer interface is to Queue it on the ADSL PVC.
for the UK :-
!
policy-map QUEUE-TRAFFIC
class ef
priority percent 25
class af31
bandwidth 16
class af21
bandwidth ??
class class-default
fair-queue
!
interface ATM0
description ADSL Interface
bandwidth 448
no ip address
no ip mroute-cache
atm vc-per-vp 64
no atm ilmi-keepalive
pvc 0 0/38
description ADSL PVC to ISP
vbr-nrt 448 448
encapsulation aal5mux ppp dialer
dialer pool-member 1
service-policy output QUEUE-TRAFFIC
!