QOS on cisco 800 series

davidbuit · ‎09-19-2007

I have configured the following on my cisco 800 series routers to priorotise traffic across my 4MB link. I am not sure if I have got the config correct as I seem to get delays with normal traffic like Citrix. Please can anyone advise on the method used ad if there is a better way of doing this?

Thanks

class-map match-any VOICE

match access-group 111

!

policy-map LLQ

class VOICE

priority 1500

set ip precedence 5

class class-default

fair-queue

policy-map PARENT

class class-default

shape average 3920000

service-policy LLQ

!

interface FastEthernet4

ip address 172.16.0.1 255.255.255.0

load-interval 30

service-policy output PARENT

!

access-list 111 permit ip 10.10.40.0 0.0.0.255 10.10.30.0 0.0.0.255

access-list 111 permit udp any any precedence critical

spremkumar · ‎09-19-2007

Hi

which cisco router model you are using up over there ?

i dont think cisco 800 series model is capable of handling 4Mbps link with all qos flavors configured on it.

regds

davidbuit · ‎09-20-2007

It is a Cisco 871 router.

Thanks

spremkumar · ‎09-20-2007

hi

are you trying to configure qos on an internet link ?

QOS configurations has to be an end to end configuration where in any break in between will not yield the desired results for you.

regds

davidbuit · ‎09-20-2007

Thanks for the reply. No, this is not over an internet link. It is a dedicated link between two sites. It is rated limited to 4MB by the ISP.

Ta

spremkumar · ‎09-20-2007

hi

can you confirm whether your SP is honouring your marking out there in his PE router and mapping the same to his backbone markings ?

If he doesnt honour your marking and dont map it with his backbone markings you may end up in experiencing packet drops.

regds

kradjesh13 · ‎09-20-2007

Usually citrix will use TCP ports 1494, 2598 and UDP port 1604.

access-list 110 remark Citrix-Prioritization

access-list 110 permit tcp any eq 1494 any

access-list 110 permit tcp any any eq 1494

access-list 110 permit udp any eq 1604 any

access-list 110 permit udp any any eq 1604

access-list 110 permit tcp any eq 2598 any

access-list 110 permit tcp any any eq 2598

class-map match-any CITRIX

match protocol citrix

match access-group 110

policy-map OUTBOUND

class CITRIX

priority percent

class class-default

fair-queue

interface Fastethernet 4

service-policy output OUTBOUND

If you are using any other ports you can create an ACL for that.

Hope this might help you..

Thanks

Rajesh

davidbuit · ‎09-20-2007

Thanks Rajesh...

What would be the best way to include QOS for my voice traffic? Voice traffic is defined using this acl

access-list 111 permit ip 10.10.40.0 0.0.0.255 10.10.30.0 0.0.0.255

access-list 111 permit udp any any precedence critical

Thanks!

kradjesh13 · ‎09-20-2007

class-map match-any CITRIX

description CITRIX

match protocol citrix

match access-group 110

class-map match-any VOICE

description VOIP

match access-group 111

match ip dscp ef

match ip precedence 5

policy-map OUTBOUND

class CITRIX

priority percent

class VOICE

priority percent

class class-default

fair-queue

interface Fastethernet 4

max-reserved-bandwidth <----Add this line, if the total percentage goes above 75%

service-policy output OUTBOUND