03-28-2007 04:32 PM - edited 03-03-2019 04:20 PM
1. I've multiple remote sites running 2811 routers with QoS enabled for the serial interfaces. Hanging from the routers are either Catalyst 3550 or 3560 switches. My question is that since the QoS is already enabled in the router, does the QoS need to be enabled and configured in the switches too?
2. I also have a Catalyst 6509 running QoS. Hanging off it are some 3560 switches connected via fiber link. Should QoS also be enabled on the 3560s?
Any real benefits of having QoS enabled in both router and switches...?
Your input is greatly appreciated.
TIA,
hieu
03-28-2007 05:18 PM
Hie Hieu,
This depends on the purpose you are using QoS for.
If you have a voice setup where say you are using some kind of IP phones or end vocie devices, then it will be a good idea to have end to end QoS for voice traffic.
On the other hand if you are only looking towards data not involving any critical applications, and where you think your 100 Mbps or Gbps LAN will never face congestion, it might be okay to run QoS only on the slower WAN links
03-28-2007 05:34 PM
Hi Anand,
Thanks very much for your response.
I forgot to mention that we're running VoIP in our network with quite a few IP phones and all remote links are point-to-point T1s.
The reason why I am asking about this is that I am trying to troubleshoot our video conference audio/video quality issue. We use a Polycom unit set at 384kbps and the bandwith for the Video class is 33% (506 kbps). The QoS seems to be working fine as there's no packets dropped from either end of the local and remote routers when the video conference unit is in use, but video and audio are quite choppy at times. The video conference unit is Polycom configured with IP Precedence 4. I've also verified that the config is set the same at the remote unit.
Here's my QoS config in the routers:
class-map match-any Critical-Data2
match protocol citrix
match protocol sqlnet
match protocol sqlserver
match protocol custom-01
match protocol custom-02
match protocol printer
match protocol secure-http
match protocol ntp
match protocol netbios
match protocol custom-03
match protocol custom-04
class-map match-any Network-Control2
match ip dscp cs6
match ip dscp cs2
class-map match-any Interactive-Video2
match ip precedence 4
class-map match-any Call-Signaling2
match ip dscp cs3
class-map match-all Voice2
match ip dscp ef
class-map match-all Scavenger2
match ip dscp cs1
!
policy-map WAN-EDGE2
class Voice2
priority percent 20
class Call-Signaling2
bandwidth percent 5
class Critical-Data2
set ip dscp af21
bandwidth percent 23
random-detect dscp-based
class Network-Control2
bandwidth percent 5
class Scavenger2
bandwidth percent 1
class Interactive-Video2
priority percent 33
class class-default
bandwidth percent 10
random-detect dscp-based
random-detect dscp 0 36 40
interface Serial0/0/0
ip address xxx.xxx.xxx.xxx
ip nbar protocol-discovery
ip flow egress
no ip mroute-cache
max-reserved-bandwidth 100
service-policy output WAN-EDGE2
Is there something I can do to make the audio/video quality better over the WAN link? Should the QoS be enabled in the switches too?
Thanks!
hieu
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