Ive spent alot of time recently getting to grips with QoS but as yet i have been unable to find a definitive method for calculating traffic rates, CIR Values and Burst values specially for policing on differing links speeds.
For example i have a 2Mbit/s leased line and im configuring QoS on an ASA, ive configured a class for voice and used the class-default for all other traffic, in the policy map i have set priority on the voice class and policed traffic for the best effort class at 1536000 and a burst of 1500 bytes which is 3/4 of the link speed and based on the assumption that i should leave room for voice traffic even though it is priority queued, but i am unsure whether the full link speed on 2000000 should be specified and let the priority handle voice traffic.
Config:
access-list voice extended permit tcp any host 146.101.248.200 eq sip
access-list voice extended permit udp any host 146.101.248.200 eq sip
access-list voice extended permit udp any host 146.101.248.200 range 16384 32767
!
priority-queue outside
!
class-map inspection_default
match default-inspection-traffic
class-map qos-voice-class
match access-list voice
!
policy-map qos-outside-pol
class qos-voice-class
priority
class class-default
police output 1536000 1500
police input 1536000 1500
!
service-policy qos-outside-pol interface outside
Any help would be much appreciated.
Regards
