Hi Guys,
We have recently implemented some QoS on our routers and i have noticed that the CPU usage has risen enormously as a result. Can someone advise if this is normal?
I checked the CPU Processes and found that the avg values are 50% usage. This seems rather high considering that only 75% of our edge routers have this feature enabled.
Our main router is a Cisco CISCO2911/K9 (revision 1.0) with 487424K/36864K bytes of memory. Our edge routers are either 2801 models or 881 models.
This is our first implementation of QoS and would like to ensure that it is working properly before implementing other QoS rules. Here is a copy of the config on the 2911 router:
class-map match-all Citrix
match protocol citrix
class-map match-all Print
match protocol printer
class-map match-all C-Coolingata
match access-group name Coolingata
class-map match-all C-Hawthorn
match access-group name Hawthorn
class-map match-all C-MonaVale
match access-group name MonaVale
!
!
policy-map Shape2M
class Citrix
priority percent 80
set dscp af41
class Print
bandwidth remaining percent 20
set dscp af11
random-detect
class class-default
bandwidth remaining percent 80
random-detect
policy-map Global
class C-Hawthorn
shape average 2048000
service-policy Shape2M
class C-MonaVale
shape average 2048000
service-policy Shape2M
class C-Coolingata
shape average 2048000
service-policy Shape2M
policy-map Shape4M
class Citrix
priority percent 80
set dscp af41
class Print
bandwidth remaining percent 20
set dscp af11
random-detect
class class-default
bandwidth remaining percent 80
random-detect
policy-map Shape1M
class Citrix
priority percent 80
set dscp af41
class Print
bandwidth remaining percent 20
set dscp af11
random-detect
class class-default
bandwidth remaining percent 80
random-detect
ip access-list extended Coolingata
permit ip any 192.168.65.0 0.0.0.255
ip access-list extended Hawthorn
permit ip any 192.168.76.0 0.0.0.255
ip access-list extended MonaVale
permit ip any 192.168.34.0 0.0.0.255
int LAN0
ip nbar protocol-discovery
int WAN
service-policy output Global
Here is the config on our edge routers:
class-map match-any Citrix
match access-group name Citrix-ACL
policy-map WAN
class Citrix
priority percent 80
set dscp af41
class class-default
bandwidth remaining percent 100
random detect OR fair queue (dependant on router type)
policy-map Global
class class-default
shape average 20480000 (number equal to the link speed)
service-policy WAN
ip access-list extended Citrix-ACL
permit tcp any 192.168.1.0 0.0.0.255 eq 1494
permit tcp any 192.168.1.0 0.0.0.255 eq 1604
int WAN
service-policy output Global
As you can see we have different link speeds at different sites based on their size, location etc.
Can anyone see any issues or be able to confirm that this config is correct?
Your help is appreciated
Regards,
